WHITTAKER CORP
8-K, 1995-05-09
MISCELLANEOUS FABRICATED METAL PRODUCTS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C.   20549



                                   FORM 8-K

 

                                CURRENT REPORT
                    Pursuant to Section 13 or 15(d) of the
                        Securities Exchange Act of 1934



Date of Report (Date of earliest event reported):  April 24, 1995



                             WHITTAKER CORPORATION
            (Exact name of registrant as specified in its charter)



   Delaware                    1-5407                     95-4033076 
(State or other             (Commission                 (IRS employer
 jurisdiction of            File Number)                 Identification
 incorporation)                                          Number)


10880 Wilshire Boulevard, Los Angeles, California  90024
 (Address of principal executive offices)         (Zip Code)



Registrant's telephone number, including area code:(310) 475-9411
<PAGE>
 
Item 2.  Acquisition or Disposition of Assets

(a)  Pursuant to a Stock Purchase Agreement dated as of March 23, 1995 by and
     between Whittaker Corporation (the "Registrant") and Hughes Aircraft
     Company ("Hughes"), as amended on April 24, 1995, the Registrant purchased
     all of the outstanding common stock of Hughes LAN Systems, Inc. ("HLS"), a
     wholly-owned subsidiary of Hughes, for consideration consisting of (i)
     $17,500,000 in cash, to be increased or decreased to the extent that as of
     April 24, 1995 the net amount of working capital of HLS is greater than or
     less than $8,246,000 by more than $100,000, as the case may be; (ii) a 7%
     convertible subordinated promissory note in the principal amount of
     $15,000,000 (the "Note") issued by the Registrant to Hughes; and (iii)
     contingent payments based on the revenues from the sale by HLS of certain
     products during the four year period from November 1, 1995 through October
     31, 1999 (not to exceed $25,000,000 in the aggregate). The transaction
     closed on April 24, 1995.

     The cash portion of the consideration paid by the Registrant came from a
     combination of working capital of the Registrant and borrowings under the
     Registrant's credit agreement with NationsBank of Texas, N.A., as agent,
     and certain other financial institutions who are parties thereto (Exhibit
     10.8 to Form 10-K for fiscal year ended October 31, 1994).

(b)  The acquisition of stock entitles the Registrant to indirect ownership of
     the equipment and other physical property of HLS, and the leasehold
     interests of HLS in plant facilities.  Such assets have been used by HLS
     primarily for the production and sale of certain telecommunication
     products, and the Registrant intends to continue such use.

Item 7.  Financial Statements and Exhibits

(a)-(b)
     It is impracticable to provide the required financial statements for the
     acquisition described in Item 2 as of the date hereof. Such financial
     statements will be filed as soon as practicable, but not later than 60 days
     following the filing hereof.

(c)  Exhibit 10.1--Stock Purchase Agreement dated as of March 23, 1995 by and
     between the Registrant and Hughes, as amended on April 24, 1995.

                                       2
<PAGE>
 
                                 Signature
                                 ---------



     Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                             WHITTAKER CORPORATION
                                      
                                             BY   /S/  RICHARD LEVIN
                                             --------------------------
                                             Richard Levin
                                             Vice President, Chief 
                                             Financial Officer 
                                             and Secretary


Dated:  May 8, 1995

                                       3
<PAGE>
 
                                   EXHIBITS


Exhibit No.                                       Description
- -----------                                       -----------

   10.1                                           Stock Purchase Agreement dated
                                                  as of March 23, 1995 by and
                                                  between Registrant and Hughes,
                                                  as amended on April 24, 1995.

                                       4

<PAGE>
 
                                                                Exhibit 10.1
                                                                ------------
                     AMENDMENT TO STOCK PURCHASE AGREEMENT
                     -------------------------------------

     THIS AMENDMENT TO STOCK PURCHASE AGREEMENT ("amendment"), dated and
effective as of April 24, 1995, is made and entered into by and between HUGHES
AIRCRAFT COMPANY, a Delaware Corporation ("Hughes"), and WHITTAKER CORPORATION,
A Delaware corporation ("Whittaker").

     HUGHES and WHITTAKER agree as follows:

     1.   Effect of Amendment.  This Amendment supplements and amends the Stock 
          -------------------                 
Purchase Agreement dated as of March 23, 1995 between Hughes and Whittaker (the
"Agreement"). Except as amended hereby, the Agreement is ratified and confirmed
and shall remain in effect in accordance with its terms. For purposes of this
Amendment capitalized terms not otherwise defined herein shall have the meanings
given them in the Agreement. All references in the Agreement or any Related
Document to the Stock Purchase Agreement (or similar references) shall mean such
Agreement as amended by this Amendment.

     2.   Closing.  The Closing is occurring on April 24, 1995, immediately
          -------                                    
after the execution of this Amendment.

     3.   Cash Payment.  The amount of the Cash Payment paid by Whittaker to 
          ------------                         
Hughes on the Closing Date is $17,500,000, which payment shall be subject to
adjustment after the Closing Date in accordance with Section 1.6 of the
Agreement as amended by this Amendment.

     4.   Adjustment in Cash Payment
          --------------------------

          4.1   Amendment of Section 1.6(b) of the Agreement. The first sentence
                --------------------------------------------
of Section 1.6(b) of the Agreement is amended to read as follows:

                "Hughes shall prepare and deliver to Whittaker on or before May
                1, 1995, an unaudited Statement of Working Capital of the
                Company as of April 23, 1995 ("Proposed Statement of Working
                Capital" or "Proposed Working Capital Statement").

          4.2   Amendment of Section 1.6(c) of the Agreement.  Section 1.6(c) of
                --------------------------------------------                    
the Agreement is amended to read as follows:

                "Within two business days after delivery by Hughes to Whittaker
                of the Proposed Statement of Working Capital, (i) if the
                Proposed Amount is greater than the sum of the Base Amount plus
                $100,000, then Whittaker shall pay Hughes the difference between
                the Proposed Amount and the Base Amount by wire transfer of
                immediately available funds to such account as shall be
                specified by Hughes, and (ii) if the Base Amount is greater than
                the sum of the proposed amount plus $100,000, then Hughes shall
                pay
<PAGE>
 
                Whittaker the difference between the Base Amount and the
                proposed Amount by wire transfer of immediately available funds
                to such account as shall be specified by Whittaker."

          4.3   Amendment of Section 1.6(d) of the Agreement.  Section 1.6(d) of
                --------------------------------------------                    
the Agreement is amended by changing "April 16, 1995" to "April 23, 1995"
wherever it appears in such Section.

          4.4   Amendment of Section 1.6(f) of the Agreement.  The last sentence
                --------------------------------------------                    
of Section 1.6(f) is amended to read as follows:

                "Notwithstanding the foregoing, no payment shall be required if
                neither party shall have been required to make any payment under
                Section 1.6(c) and if the positive or negative difference
                between the Final Amount and the Base Amount is $100,000 or
                less."

     5.   Amendment of Section 7.7(a) of the Agreement.   Notwithstanding
          --------------------------------------------                   
anything in Section 7.7(a) of the Agreement to the contrary:  (a) the "Cutoff
Date" shall be April 23, 1995, rather than April 16, 1995; (b) the Final
Intercompany Advance by Hughes to the Company was $827,384.97, which was made on
April 21, 1995, and which shall be included in the cash of the Company in
determining its Working Capital in accordance with Section 1.6 to the extent
that outstanding checks which have not cleared the Company's disbursement
checking accounts prior to the Cutoff Date are still treated as liabilities of
the Company in determining Working Capital as provided in Section 1.6.

     6.   Amendment of Section 8.4 of the Agreement.   Notwithstanding anything
          -----------------------------------------                            
in Section 8.4 of the Agreement to the contrary, Whittaker and Hughes agree as
follows with respect to certain benefit plans and arrangements for the Company's
employees:

     (a)  Until not later than October 31, 1995, Hughes will continue to provide
          COBRA covered benefits, at Whittaker's expense, at the levels provided
          prior to the Closing Date to all Employees of the Company on the
          Closing Date, including such benefits under medical, dental, psych/CD
          and vision care benefits programs.

     (b)  Hughes shall remain liable for all claims arising from any work-
          related disability (including workers' compensation) with respect to
          the Company's Employees, for all periods of service on or prior to the
          Closing Date, and Whittaker shall be liable for all claims arising
          from any work-related disability (including workers' compensation)
          with respect to the Company's Employees for all periods of service
          after the Closing Date.  Hughes shall refer to Whittaker any claim
          made by a Company Employee arising from a work-related disability or
          loss incurred covered under any welfare plan maintained by the Company
          or Whittaker or required by law (including workers' compensation),
          which disability or loss incurred arose with respect to periods
          subsequent to the Closing date.  Whittaker shall 

                                      -2-
<PAGE>
 
          refer to Hughes any claim made by a Company employee on or after the
          Closing Date, arising from a work-related disability or loss incurred
          covered under any such welfare plan maintained by Hughes or required
          by law (including workers' compensation), which disability or loss
          incurred arose with respect to service on or prior to the Closing
          Date.

     (C)  With regard to the earned but not accrued and not vested sick leave
          carryover of the Company employees, Hughes shall reimburse Whittaker
          for (i) the bona fide paid sick leave of all existing Company
          employees at the Closing Date as a group actually taken by such
          employees during the period from the Closing Date through October 31,
          1995 (or, if sooner, the date on which the carryover sick leave policy
          of the Company is terminated by Whittaker) in accordance with the
          existing policies of the Company as of the Closing Date and to the
          extent of the sick leave carryover days of such Company Employees as
          of the Closing date, and (ii) one-half of such paid sick leave during
          the period from November 1, 1995 through October 31, 1996 (or, if
          sooner, the date on which the carryover sick leave policy of the
          Company is terminated by Whittaker), in either case (i.e., clause (i)
          or (ii)) only to the extent such actual bona fide paid sick leave in
          the aggregate is in excess of two and one-half days per applicable
          Company employee during the period from the Closing Date through
          October 31, 1995 and five days per applicable Company employee for the
          period from November 1, 1995 through October 31, 1996.  in no event
          will Hughes have any obligation with regard to employee sick leave for
          any period after the earlier of (x) October 31, 1996 and (y) the date
          on which Whittaker changes the sick leave policy of the Company to
          eliminate the carryover of unused sick leave.  No additional accrual
          will be made with respect to this item in determining Working Capital
          as of the Closing Date.  Whittaker shall administer the sick leave
          policy in a manner consistent with the policies of the Company during
          the period prior to the Closing Date, shall not take any action to
          cause, induce or encourage any Company employee to take sick leave
          other than bona fide sick leave, consistent with past practice, and
          will disallow sick leave if it is not bona fide.  Whittaker shall also
          endeavor in good faith to minimize Hughes' liability under this
          paragraph, through the use of short-term disability insurance or state
          disability insurance or by adopting alternative policies, if practical
          under the circumstances.  Whittaker shall consult with Hughes, and
          provide hughes the form of any proposed announcements to Company
          employees of benefits policies or changes in benefits, so that Hughes
          can be assured of Whittaker's compliance with the preceding sentences.
          Whittaker shall provide reasonable supporting detail, by affected
          employee and in the aggregate, for any claims under this paragraph,
          with semi-annual reports to be made promptly after the expiration of
          each six-month period ending on October 31 or April 30, during the
          term of the special Hughes indemnity under this paragraph.  Any amount
          owing by Hughes to Whittaker under this 

                                      -3-
<PAGE>
 
          paragraph shall be credited against the first Contingent Payment owing
          by Whittaker to Hughes (or its assignee) under Exhibit 1.6(b).
 
     7.   Transfer to Hughes Electronics Corporation. Effective as of the
          ------------------------------------------  
Closing Date, Hughes has transferred and assigned to Hughes Electronics
Corporation ("HEC"), the sole stockholder of Hughes, all right, title and
interest of Hughes in and to the Note, The Registration Agreement and any
Contingent Payments, and Whittaker acknowledges and consents to such assignment
and transfer, and agrees that the Note shall be issued in the name of HEC,
rather than Hughes, and that all references to Hughes in Exhibit 1.3(c) or in
Section 4.4 of the Agreement shall mean HEC. notwithstanding such transfer and
assignment, all rights of setoff provided for in the Agreement or in the Note
shall be preserved. In connection with the transfer and assignment of the Note,
the representations of Hughes in Section 3.23 are accepted and affirmed by HEC.

     8.   MISCELLANEOUS. The relevant provisions in Article xiii of the
          -------------      
Agreement shall apply to this Amendment and are incorporated herein by this
reference.

     Executed on April 24, 1995.

                                                     HUGHES AIRCRAFT COMPANY



                                                     BY:  /S/ KENNETH N. HEINTZ
                                                          ---------------------
                                                          Its:  Vice President

                                                     WHITTAKER CORPORATION



                                                     BY:  /S/ RICHARD LEVIN
                                                          ---------------------
                                                          Its:  CFO & VP

Accepted and affirmed, as provided
in Section 7 of the foregoing
Amendment:

HUGHES ELECTRONICS CORPORATION




BY:  /S/ KENNETH N. HEINTZ
     -----------------------
     Its:

                                      -4-
<PAGE>
 
                           STOCK PURCHASE AGREEMENT


                                    BETWEEN


                            HUGHES AIRCRAFT COMPANY


                                      AND

                             WHITTAKER CORPORATION


                             DATED: MARCH 23, 1995
<PAGE>
 
                           STOCK PURCHASE AGREEMENT
                                    BETWEEN
                            HUGHES AIRCRAFT COMPANY
                                      AND
                             WHITTAKER CORPORATION
                                MARCH 23, 1995
                                  
<TABLE>
                               TABLE OF CONTENTS

                                   ARTICLE I
                          PURCHASE AND SALE OF STOCK
<S>                                                                   <C>
1.1   Purchase of Stock...............................................1
1.2   Closing.........................................................1
1.3   Consideration...................................................1
1.4   Deliveries by Hughes............................................2
1.5   Deliveries by Whittaker.........................................2
1.6   Adjustment in Cash Payment......................................3
 
                                  ARTICLE II
                                  DEFINITIONS
2.1   Certain Defined Terms...........................................5
2.2   Other Defined Terms.............................................8
2.3   Certain Rules of Construction...................................8
 
                                  ARTICLE III
                   REPRESENTATIONS AND WARRANTIES OF HUGHES
3.1   Organization and Authority......................................9
3.2   Authorization and Binding Obligation............................9
3.3   Absence of Conflicting Agreements or Consents...................9
3.4   Capitalization; Corporate Books................................10
3.5   Governmental Licenses..........................................10
3.6   Government Contracts Claims....................................10
3.7   Real Property..................................................11
3.8   Title to Properties............................................13
3.9   Material Contracts.............................................14
3.10   Licenses and Copyrights.......................................14
3.11   Financial Statements; Accounts................................15
3.12   Personnel; Employee Benefit Plans.............................16
3.13   Claims and Legal Actions......................................17
3.14   Compliance with Laws..........................................17
3.15   Hazardous Materials...........................................17
3.16   Taxes.........................................................17
3.17   Material Changes..............................................18
</TABLE> 

                                       i
<PAGE>
 
<TABLE>  
<S>                                                                  <C> 
3.18   Product Warranties............................................18
3.19   Advances and Related Party Transactions.......................18
3.20   Bank Accounts.................................................19
3.21   Powers of Attorney............................................19
3.22   Insurance.....................................................19
3.23   Representations Regarding Note................................19
3.24   Brokers' and Finders' Fees....................................19

<CAPTION> 
                                  ARTICLE IV
                  REPRESENTATIONS AND WARRANTIES OF WHITTAKER
4.1   Organization and Authority.....................................20
4.2   Authorization and Binding Obligation...........................20
4.3   Absence of Conflicting Agreements or Consents..................20
4.4   Capitalization.................................................21
4.5   Financial Statements; Public Reports...........................21
4.6   Claims and Legal Actions.......................................21
4.7   Compliance with Laws...........................................22
4.8   Taxes..........................................................22
4.9   Material Changes...............................................22
4.10   Representations Regarding Stock...............................22
4.11   Brokers' and Finders' Fees....................................22

<CAPTION> 
                                   ARTICLE V
               MUTUAL ACKNOWLEDGMENTS REGARDING REPRESENTATIONS
5.1   Survival of Representations and Warranties.....................23
5.2   Exclusion of other Representations.............................23

<CAPTION> 
                                  ARTICLE VI
                    CONDUCT OF BUSINESS PENDING THE CLOSING
6.1   Conduct of Business by the Company.............................23
6.2   Conduct of Whittaker's Business................................24

<CAPTION> 
                                  ARTICLE VII
            OTHER COVENANTS OF THE PARTIES PENDING THE CLOSING DATE
7.1   HSR Act Filings................................................25
7.2   No Shopping, Etc...............................................25
7.3   Consents.......................................................25
7.4   Cooperation....................................................25
7.5   Supplements to Disclosure Schedule.............................26
7.6   Confidentiality Agreement......................................26
7.7   Cash Management, Forgiveness of Intercompany Advances..........26
</TABLE> 

                                      ii
<PAGE>
 

                                 ARTICLE VIII
                            POST-CLOSING COVENANTS
<TABLE> 

<S>                                                                  <C> 
8.1   Access to Books and Records....................................27
8.2   Tax Matters....................................................27
8.3   Covenant Not to Interfere with Business........................29
8.4   Employee Matters...............................................29
8.5   Transitional Services and Continuing Business Relationships....31
8.6   Releases.......................................................31
8.7   Intellectual Property..........................................31
8.8   Audit of Company Financial Statements..........................31
8.9   Compliance with Contingent Payment Obligations.................32
8.10   Change of Name................................................32
 
                                  ARTICLE IX
                     CONDITIONS TO WHITTAKER'S OBLIGATIONS
9.1   Representations and Warranties.................................33
9.2   Covenants......................................................33
9.3   Consents.......................................................33
9.4   Governmental Authorizations....................................33
9.5   Certificate....................................................33
9.6   Deliveries.....................................................33
9.7   No Injunction..................................................33
9.8   Expiration of Waiting Period...................................34
9.9   Bank Approval..................................................34
 
                                   ARTICLE X
                       CONDITIONS TO HUGHES' OBLIGATIONS
10.1   Representations and Warranties................................34
10.2   Covenants.....................................................34
10.3   Certificate...................................................34
10.4   Deliveries....................................................34
10.5   Consents......................................................34
10.6   No Injunction.................................................34
10.7   Expiration of Waiting Period..................................35
 
                                  ARTICLE XI
                          TERMINATION AND ABANDONMENT
11.1   Termination...................................................35
11.2   Effect of Termination.........................................35
 
                                  ARTICLE XII
                                   INDEMNITY
12.1   Indemnification by Hughes.....................................36
12.1A   Infringement Indemnification by Hughes.......................36
</TABLE> 
         
                                      iii
<PAGE>
 
<TABLE>  

<S>                                                                  <C> 
12.2   Indemnification by Whittaker..................................37
12.3   Procedure for Indemnification.................................37
12.4   Limitations and Conditions Applicable to Whittaker............39
12.5   Limitations Applicable to all Parties.........................40
12.6   Other Matters.................................................40
12.7   Remedies Exclusive............................................41
12.8   Repurchase Option.............................................42
12.9   Treatment of Indemnity Payments...............................42
12.10   Setoff.......................................................42
 
                                ARTICLE XIII
                           MISCELLANEOUS PROVISIONS
13.1   Fees and Expenses.............................................43
13.2   Notices.......................................................43
13.3   Benefit and Binding Effect....................................44
13.4   Further Assurances............................................45
13.5   Governing Law.................................................45
13.6   Headings......................................................45
13.7   Gender and Number.............................................45
13.8   Entire Agreement..............................................45
13.9   Counterparts..................................................45
13.10   Public Announcements.........................................45
13.11   Dispute Resolution...........................................46
13.12   Acknowledgment...............................................47



                                      iv
</TABLE>
<PAGE>
 
                   LIST OF SCHUDLES AND EXHIBITS
                   -----------------------------

    EXHIBIT NO                      DESCRIPTION
    ----------                      -----------

        1.3(b)            Note         
        1.3(c)            Contingent Payments
        1.4(f)            Registration Agreement
        1.5(b)            Opinion of Whittaker Counsel
        1.5(d)            Excluded Adjustments
        1.6(b)            Non-Competition Adjustments
        8.3(b)            Retention Plan
        8.4(c)            Transitional Services Agreement
        8.5(a)            Intellectual Property Agreement
        8.7

   SCHEDULE NO.                     DESCRIPTION
   -----------                      -----------

        1.6(a)            December 24 Statement of Working Capital 
        2.2               Defined Terms
       III                Hughes Disclosure Schedule
        3.1               States in which Company Qualified
        3.3               Hughes Consents
        3.5               Governmental Licenses
        3.6               Government Contract Claims 
        3.7(a)            Leased Real Estate
        3.8(a)            Liens
        3.8(c)            Accounts Receivable
        3.9(a)            Material Things
        3.9(b)            Defaults
        3.10(a)           Intellectual Property
        3.10(b)           Third Party Rights
        3.10(c)           Confidentiality Agreements
        3.11(a)           Company Financial Statenents
        3.11(c)           Liabilities
        3.12(a)           Company Plans
        3.13              Legal Proceedings
        3.17              Material Changes
        3.18              Product Warranties
        3.19              Related Party Transactions
        3.20              Banks Accounts
        3.21              Powers of Attorney
        3.22              Insurance
       IV                 Whittaker Disclosure Schedule 
        4.3               Whittaker Consents
        4.4               Whittaker Stock Rights
        4.6               Whittaker Legal Proceedings
        6.1(d)            Increase in Compensation
        8.4(a)            Whittaker Benefit Plans
        8.4(b)            Hughes Plans
        8.5(b)            Intercompany Relationships
                                       v
<PAGE>
 
                           STOCK PURCHASE AGREEMENT

THIS STOCK PURCHASE AGREEMENT ("Agreement"), dated and effective as of March 23,
1995, is made and entered into by and between HUGHES AIRCRAFT COMPANY, a
Delaware corporation ("Hughes"), and WHITTAKER CORPORATION, a Delaware
corporation ("Whittaker") (Hughes and Whittaker are the "parties" and each is a
"party").

                                   RECITALS

     A.   Hughes is the sole shareholder of Hughes LAN Systems, Inc., a
California corporation (the "Company"), and owns one thousand (1,000) shares of
common stock, no par value (the "Stock"), of the Company. Hughes acquired
ownership of the Stock on April 24, 1989 (the "Acquisition Date").

     B.   Whittaker desires to purchase from Hughes, and Hughes desires to sell
to Whittaker, the Stock upon the terms and conditions provided in this
Agreement.

     Accordingly, the parties agree as follows:

                                   ARTICLE I
                          PURCHASE AND SALE OF STOCK

     1.1  Purchase of Stock.  Subject to the terms and conditions of this
          -----------------                                              
Agreement, at the Closing (as defined in Section 1.2), Whittaker shall purchase
from Hughes, and Hughes shall sell to Whittaker, the Stock for the consideration
specified in Section 1.3.

     1.2  Closing.  The closing of the transactions contemplated by this
          -------                                                       
Agreement ("Closing") shall take place at the offices of Hughes, 7200 Hughes
Terrace, Los Angeles, California, at 10:00 a.m. (Los Angeles time), on the third
business day following the date on which all of the conditions specified in
Articles IX and X shall have been satisfied or waived, but in no event later
than April 30, 1995, unless the parties otherwise mutually agree (the "Closing
Date").  Unless otherwise agreed by the parties, all matters at the Closing
shall be considered to take place simultaneously and no delivery of any document
shall be deemed complete until all transactions and deliveries of documents are
completed.

     1.3  Consideration.  The total consideration for the Stock shall consist 
          -------------                                                   
of (a) Seventeen Million Five Hundred Thousand Dollars ($17,500,000) ("Cash
Payment"), subject to adjustment as provided in Section 1.6, payable by

                                       1
<PAGE>
 
Whittaker in immediately available funds at the Closing; (b) Fifteen Million
Dollars ($15,000,000) payable as provided in the Convertible Subordinated
Promissory Note in the form attached as Exhibit 1.3(b) (the "Note"), to be
                                        --------------                    
issued by Whittaker and (c) contingent payments calculated and payable as
provided in Exhibit 1.3(c) (the "Contingent Payments").
            --------------                             

     1.4  Deliveries by Hughes.  At the Closing, Hughes shall deliver the
          --------------------                                           
following documents to Whittaker:

     (a)  certificate for 1000 shares of the Stock, duly endorsed in blank for 
          transfer or accompanied by duly executed stock powers assigning the
          Stock in blank, in proper form for transfer;

     (b)  an instrument of cancellation with respect to any Intercompany
          Advances owing by the Company to Hughes, other than trade or other
          payables incurred in the ordinary course of business, which
          Intercompany Advances shall have been contributed to the capital of
          the Company by Hughes in accordance with Section 7.7(b);

     (c)  resignations, effective as of the Closing Date, of all directors and
          officers of the Company requested by Whittaker;

     (d)  the minute books, stock transfer books and other books and records of
          the Company to the extent such books and records are located other
          than at the offices of the Company;

     (e)  the certificate required of an officer of Hughes pursuant to Section
          9.5;

     (f)  an opinion of counsel to Hughes substantially in the form attached as
          Exhibit 1.4(f);
          -------------- 

     (g)  a receipt for the Cash Payment; and

     (h)  such other documents and instruments as may be reasonably required by
          Whittaker to be delivered by Hughes at or prior to the Closing in
          accordance with this Agreement.

     1.5  Deliveries by Whittaker.  At the Closing, Whittaker shall deliver 
          -----------------------
the following to Hughes:

                                       2
<PAGE>
 
     (a)  Whittaker shall pay the Cash Payment to Hughes by wire transfer of
          immediately available funds to such account as shall be specified by
          Hughes prior to the Closing Date;

     (b)  Whittaker shall issue and deliver the Note to Hughes and shall execute
          and deliver to Hughes the related Registration Rights Agreement
          ("Registration Agreement") in the form attached as Exhibit 1.5(b);
                                                             --------------

     (c)  The certificate required of an officer of Whittaker pursuant to
          Section 10.3;

     (d)  an opinion of counsel for Whittaker, substantially in the form
          attached as Exhibit 1.5(d); and
                      --------------     

     (e)  such other documents and instruments as may be reasonably required by
          Hughes to be delivered by Whittaker at or prior to the Closing in
          accordance with this Agreement.

     1.6  Adjustment in Cash Payment.
          -------------------------- 

     (a)  Attached as Schedule 1.6(a) is an unaudited Statement of Working
                      ---------------                                     
          Capital of the Company as of December 25, 1994, prepared in accordance
          with GAAP (the "December 25 Statement"). The net amount of Working
          Capital shown in such December 25 Statement ($9,246,000) minus One
          Million Dollars ($1,000,000) (that is, $8,246,000) is referred to as
          the "Base Amount."

     (b)  Hughes shall prepare and deliver to Whittaker, at least two business
          days prior to the Closing Date, an unaudited Statement of Working
          Capital of the Company as of April 16, 1995 ("Proposed Statement of
          Working Capital"). Such Proposed Statement of Working Capital shall be
          prepared in accordance with GAAP, applied on a basis consistent with
          that employed in the preparation of the December 25 Statement, using
          the same accounting methods, policies, practices and procedures with
          consistent classifications, judgments and valuation and estimation
          methodologies used in preparing the December 25 Statement, and shall
          reflect all adjustments necessary to remove the effects, if any,
          resulting from any change in Working Capital, or the components
          thereof, caused by any of the matters listed in Exhibit 1.6(b). The
                                                          --------------
          net amount of Working Capital shown in the Proposed Working Capital
          Statement is referred to herein as the "Proposed Amount".

                                       3
<PAGE>
 
     (c)  The Cash Payment at Closing shall be increased (decreased) by any
          positive (negative) difference obtained by subtracting the Base Amount
          from the Proposed Amount; provided, however, that there shall be no
          adjustment in the Cash Payment at Closing if the positive or negative
          difference between the Proposed Amount and the Base Amount is $100,000
          or less.

     (d)  Whittaker may object to the Proposed Statement of Working Capital (but
          only on the basis that it has not been prepared in accordance with
          Section 1.6(b) or that it contains mathematical errors) by delivering
          to Hughes, at any time within thirty (30) days after the Closing Date,
          written notice of any objections, specifying the amount in dispute and
          the basis for such objections in reasonable detail. If there are no
          objections within such period, or if Hughes and Whittaker agree on the
          resolution of such objections, such Proposed Statement of Working
          Capital, with such changes as are agreed to, shall be final and
          binding on the parties. If Hughes and Whittaker shall fail to reach an
          agreement with respect to all objections within 60 days, then all
          unresolved objections shall, at the option of either party, be
          submitted for final and binding resolution to Arthur Andersen & Co.
          ("Arbiter"). Promptly, but not later than 60 days after its
          appointment, the Arbiter shall determine, based solely on
          presentations made by Hughes and Whittaker and not by independent
          determination by the Arbiter, those items in dispute and shall render
          a report as to the disputed items. In resolving any disputed item, the
          Arbiter may not assign a value to any particular item greater than the
          greatest value for such item claimed by either party or less than the
          smallest value for such item claimed by either party, in each case as
          presented to the Arbiter. The amount of Working Capital as of April
          16, 1995, as finally determined, is referred to herein as the "Final
          Amount" and the Proposed Statement of Working Capital, as adjusted to
          reflect the final determination of Working Capital as of April 16,
          1995, is referred to herein as the "Final Statement of Working
          Capital." The determination of the Final Amount as provided above,
          including all components necessary for the determination thereof,
          shall be conclusive as to the valuation and amount of all items so
          valued therein and such items may not be the subject of any
          indemnification claim arising from any alleged breach of any
          representation or warranty contained in this Agreement.

                                       4
<PAGE>
 
     (e)  Each party shall cooperate with and make available to the other party,
          and to the Arbiter, all information, records, data, auditors'
          workpapers and access to its personnel and facilities, as may be
          reasonably required in connection with the analysis required under
          this Section 1.6 and the resolution of any disputes. The fees and
          expenses of the Arbiter relating to the resolution of any dispute
          shall be shared equally by Hughes and Whittaker.

     (f)  If the Final Amount is greater than the Proposed Amount, Whittaker
          shall pay Hughes the difference, plus interest at the Default Rate
          from the Closing Date to the date of payment, by wire transfer of
          immediately available funds to such account as shall be specified by
          Hughes. If the Final Amount is less than the Proposed Amount, Hughes
          shall pay Whittaker the difference, plus interest at the Default Rate
          from the Closing Date to the date of payment, by wire transfer of
          immediately available funds to such account as shall be specified by
          Whittaker. Notwithstanding the foregoing, no payment shall be required
          if there was no adjustment in the Cash Payment at Closing and if the
          positive or negative difference between the Final Amount and the Base
          Amount is $100,000 or less.

                                  ARTICLE II
                                  DEFINITIONS

     2.1  Certain Defined Terms.  In addition to the terms defined above or
          ---------------------                                            
elsewhere in this Agreement, as used in this Agreement the following terms shall
have the following meanings:

     "Affiliated Company(ies)" means Hughes Electronics Corporation, a Delaware
     corporation, and all corporations, partnerships, joint ventures, or other
     entities in which Hughes, directly or indirectly, either owns capital
     stock, is a partner, or is in some other manner affiliated through an
     investment or equity participation by Hughes in such entity.

     "Code" means the Internal Revenue Code of 1986, as amended, and the rules
     and regulations thereunder.

     "Confidentiality Agreement" means the Confidentiality Agreement dated
     November 9, 1994 between Hughes and Whittaker.

     "Consents" means the Hughes Consents (as defined in Section 3.3) and the
     Whittaker Consents (as defined in Section 4.3).

                                       5
<PAGE>
 
     "Damages" means all demands, claims, actions or causes of action,
     assessments, losses, damages, costs, expenses, liabilities, judgments,
     awards, fines, sanctions, penalties, charges, and amounts paid in
     settlement, including costs, fees, and expenses of attorneys, experts,
     accountants, appraisers, consultants, witnesses, investigators, and agents,
     but not including Consequential Damages (as defined in Section 12.7(b)),
     other than (a) Consequential Damages owing by a party to a third party or
     (b) lost profits if and to the extent permitted under Section 12.1A(c).

     "Default Rate" means a floating rate per annum equal on any day to the sum
     of (a) the prime rate as most recently published in The Wall Street
                                                         --- ---- ------
     Journal, plus (b) two percent (2%).
     -------

     "ERISA" means the Employee Retirement Income Security Act of 1974, as
     amended, and the rules and regulations thereunder.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended, and
     the rules and regulations thereunder.

     "GAAP" means generally accepted accounting principles in the United States,
     applied in a manner consistent with those used by the Company in the
     preparation of the Company Financial Statements.

     "Governmental Authority" means the government of the United States or any
     foreign government or any state, municipality or other political
     subdivision thereof or therein or any court, agency, instrumentality,
     regulatory authority or commission of any of the foregoing.

     "Governmental Regulations" means any and all laws, statutes, ordinances,
     rules, regulations, judgments, writs, injunctions, decrees, orders, awards
     and standards, or any similar requirement, of any Governmental Authority.

     "Hazardous Materials" means any substance the presence of which requires
     investigation or remediation under any Governmental Regulation or which is
     or becomes defined as a "hazardous waste," "hazardous substance," pollutant
     or contaminant under any Governmental Regulation.

     "HSR Act" means the Hart-Scott-Rodino Antitrust Improvements Act of 1976,
     as amended, and the rules and regulations thereunder.

                                       6
<PAGE>
 
     "Income Taxes" means all Taxes imposed by the United States of America or
     any state or local Governmental Authority within the United States of
     America on the net income or similar income of the Company.

     "Indemnified Taxes" means all Income Taxes and all Taxes imposed by any
     Governmental Authority on the Company for any period through the Closing
     Date in respect of payroll, employment, withholding, social security,
     workers and unemployment compensation.

     "Intellectual Property" means trade secrets (as defined by the Uniform
     Trade Secrets Act, including know-how incorporated in such trade secrets),
     copyrights, trademarks, mask works and patents.

     "Knowledge" means (a), in the case of Hughes, the actual knowledge of J.
     Shaw, Pradman Kaul, J. Lucchese, K. Heintz, T. McElroy, L. Hunter, S.
     Carrier, J. Kennedy, G. Rafferty, W. Messori and J. Cameron; and (b) in the
     case of Whittaker, the actual knowledge of Thomas A. Brancati, Richard B.
     Levin or Gordon J. Louttit.

     "Lien" means any pledge, assignment, hypothecation, mortgage, security
     interest, deposit arrangement, option, conditional sale or title retention
     arrangement, sale and leaseback transaction, financing statement filing,
     lessor's or lessee's interest under any lease, subordination of any claim
     or right, or any other type of lien, charge, encumbrance, preferential
     arrangement or other claim or right.

     "Material Adverse Effect" means, as to any Person, any event, occurrence or
     state of facts which has had, or could reasonably be expected to have, a
     material adverse effect on such Person's financial condition or results of
     operations.

     "Permitted Liens" means (a) Liens for Taxes or other charges or levies of a
     Governmental Authority which are not delinquent or which are being
     contested in good faith by appropriate proceedings and as to which adequate
     financial reserves have been established (b) pledges or deposits under
     worker's compensation legislation, unemployment insurance laws or similar
     Governmental Regulations, (c) good faith deposits in connection with bids,
     tenders, contracts or leases, including rent security deposits, (d) Liens
     imposed by Governmental Regulations, such as those of carriers,
     warehousemen and mechanics, if payment of the obligation secured thereby is
     not due and (e) pledges or deposits to secure public or statutory
     obligations or appeal bonds.

                                       7
<PAGE>
 
     "Person" means an individual, a corporation, an association, a partnership,
     a limited liability company, a trust or estate, a joint stock company, an
     unincorporated organization, a joint venture, a trade or business (whether
     or not incorporated), a Governmental Authority or any other entity.

     "Related Documents" means all agreements, documents or instruments required
     to be executed by a party pursuant to this Agreement.

     "SEC" means the Securities and Exchange Commission.

     "Taxes" means any federal, state, local or foreign taxes, duties or levies
     charged by any Governmental Authority in respect of income, gross receipts,
     sales, use, franchise, payroll, employment, withholding, social security,
     workers and unemployment compensation, property (real or personal), excise
     and all other taxes, assessments, customs, duties, charges and fees
     (including interest, penalties or additions to such taxes and any interest
     in respect of such penalties or additions).

     "Working Capital" means the difference, determined in accordance with GAAP,
     between the amount of (a) current assets, consisting of cash or marketable
     securities, accounts receivable, inventory and prepaid items, and (b)
     current liabilities, of the Company.

     2.2  Other Defined Terms.  The attached Schedule 2.2 contains a list of 
          -------------------                ------------ 
     defined terms used in this Agreement and the place in this Agreement at
     which each such term is defined.

     2.3  Certain Rules of Construction.  For purposes of this Agreement:
          -----------------------------                                  

     (a)  The words "herein," "hereof," and "hereunder," and words of similar
          import, refer to this Agreement as a whole and not to any particular
          provision of this Agreement, and references to Articles, Sections,
          Exhibits or Schedules, and similar references, are to Articles or
          Sections of, or Exhibits or Schedule to, this Agreement unless
          otherwise specified.

     (b)  Unless the context otherwise requires: (i) the singular includes the
          plural, and vice versa; (ii) all definitions and references to an 
                      ---- ----- 
          agreement, instrument or document shall mean such agreement,
          instrument or document together with all exhibits and schedules
          thereto and any and all amendments, supplements or modifications
          thereto as the same may be in effect at the time such definition or

                                       8
<PAGE>
 
          reference is applicable for any purpose; (iii) all references to any
          Person shall include such Person's successors and permitted assigns;
          and (iv) the term "including" means including without limitation.

                                  ARTICLE III
                        REPRESENTATIONS AND WARRANTIES
                                   OF HUGHES

Hughes represents and warrants to Whittaker as follows, subject to the
exceptions, limitations and qualifications set forth in the Disclosure Schedule
attached hereto as Schedule III (the "Hughes Disclosure Schedule"):
                   ------------                                    

     3.1  Organization and Authority. The Company is a corporation duly
          --------------------------                                   
organized, validly existing, and in good standing under the laws of the State of
California and is qualified to do business as a foreign corporation in the
states listed in the Schedule 3.1 of the Hughes Disclosure Schedule, which, to
                     ------------                                             
the Knowledge of Hughes, are the only states where such qualification is
necessary under applicable Governmental Regulations and where the failure to be
so qualified would cause a Material Adverse Effect.  The Company has full
corporate power and authority to own its assets ("Assets") and to carry on its
business as now being conducted and as has been conducted since the Acquisition
Date ("Business").  Hughes has full corporate power and authority to enter into
this Agreement and the Related Documents and to carry out the transactions
contemplated hereby and thereby.  The Company does not own or control, directly
or indirectly, any equity interest in any Person.

     3.2  Authorization and Binding Obligation.  The Board of Directors of
          ------------------------------------                            
Hughes has taken all action required by law to authorize the execution and
delivery of this Agreement and the Related Documents and the transactions
contemplated hereby and thereby, and this Agreement is and, when executed by
Hughes, each Related Document will be, a valid and binding obligation of Hughes
enforceable against it in accordance with its terms, except as may be limited by
bankruptcy, insolvency, moratorium or other laws affecting creditors' rights
generally and subject to general principles of equity.

     3.3  Absence of Conflicting Agreements or Consents.  Neither the execution
          ---------------------------------------------                        
and delivery of this Agreement and the Related Documents nor the consummation of
the transactions contemplated hereby and thereby will (a) violate any provisions
of the Certificate of Incorporation or Bylaws of Hughes or the Articles of
Incorporation or Bylaws of the Company, (b) violate, or be in conflict with, or
constitute a material default under or cause the acceleration of the maturity of
any debt or obligation pursuant to, any material agreement or 

                                       9
<PAGE>
 
commitment to which Hughes or, to the Knowledge of Hughes, the Company, is a
party or by which Hughes or, to the Knowledge of Hughes, the Company, is bound,
or (c) violate any Governmental Regulation applicable to Hughes or, to the
Knowledge of Hughes, the Company. No consent, approval or authorization of, or
declaration, filing or registration with, any Governmental Authority is required
in connection with the execution, delivery and performance of this Agreement or
the Related Documents by Hughes and the consummation of the transactions
contemplated hereby and thereby, except as set forth in Schedule 3.3 of the
                                                        ------------ 
Hughes Disclosure Schedule (collectively, "Hughes Consents").

     3.4  Capitalization; Corporate Books.
          ------------------------------- 

     (a)  The authorized capital stock of the Company consists of 1,000 shares
          of common stock, no par value, all of which are presently issued and
          outstanding and owned beneficially and of record by Hughes, free and
          clear of all Liens (except the rights of Whittaker under this
          Agreement). The Stock is duly authorized, fully paid, nonassessable
          and validly issued. No options, warrants, conversion privileges,
          preemptive rights, rights of first refusal or other rights, agreements
          or commitments are presently outstanding to purchase any of the
          capital stock of the Company except as provided in this Agreement.

     (b)  The copies of the Articles of Incorporation and Bylaws of the Company
          delivered by Hughes to Whittaker are complete and accurate as of the
          date of this Agreement and the minute books of the Company contains
          minutes for all meetings of, and written consents executed by, the
          shareholder and Board of Directors of the Company since the
          Acquisition Date and, to the Knowledge of Hughes, prior to the
          Acquisition Date.

     3.5  Governmental Licenses.  Schedule 3.5 of the Hughes Disclosure Schedule
          ---------------------   ------------                                  
includes a true and complete list of all material licenses, permits, and
authorizations issued by governmental agencies to the Company in connection with
the Business ("Governmental Licenses").  The Governmental Licenses are in full
force and effect, and the operations of the Business are in compliance therewith
in all material respects.

     3.6  Government Contracts Claims.  Within the five (5) years prior to the
          ---------------------------                                         
date hereof, there has been no claim or action by the United States Government
or any agency thereof (a "Government Contract Claim") against the Company with
respect to any contract or subcontract with the United States Government or any
agency or instrumentality thereof, neither has there been 

                                      10
<PAGE>
 
any voluntary disclosure to the United States Government or any agency or
instrumentality thereof, nor, to the Knowledge of Hughes, any qui tam action,
arising from the conduct of the Business prior to the date hereof including any
claim or action arising out of or in any way related to the pricing or
performance by the Company under any contract or subcontract with the United
States Government or any agency thereof under any Government procurement related
laws, rules, or regulations, including the Truth in Negotiations Act, as
amended; the Contracts Disputes Act, as amended; the Cost Accounting Standards;
the Federal Acquisition Regulations, as well as any applicable agency
supplements thereto and applicable predecessor procurement regulations; and all
other statutes, rules, or regulations governing contracts, subcontracts, bids,
proposals, quotes, or other transactions of any kind between the United States
Government and the Company. All certifications filed by the Company or by Hughes
with respect to the Company with the United States Government or any agency or
instrumentality thereof under the Federal Acquisition Regulations (the "FARS")
have been true, correct, and complete in all material respects. Reference is
made to Schedule 3.6 of the Hughes Disclosure Schedule.
        ------------       


     3.7  Real Property.
          ------------- 

     (a)  Schedule 3.7(a) of the Hughes Disclosure Schedule lists all leased 
          ---------------        
          real estate that is used in the operation of the Business and the
          Company's interests therein. The Company enjoys peaceful and
          undisturbed possession of each of its plants, offices, manufacturing
          facilities, warehouses, buildings, and all other real property and
          related facilities (collectively, the "Facilities"), and such
          Facilities are not, to the Knowledge of Hughes, subject to any
          encroachments, building or use restrictions, exceptions, reservations,
          or limitations which in any material respect interfere with or impair
          the present and continued use thereof in the usual and normal conduct
          of the Business of the Company consistent with past practice. To the
          Knowledge of Hughes, the leasehold improvements are structurally sound
          with no material defects. None of such improvements is subject to any
          commitment or other arrangement for their sale or use by any
          Affiliated Company or third parties. To the Knowledge of Hughes, there
          are no condemnation proceedings pending or threatened against any
          Facilities or any part thereof, and no Governmental Authority has
          expressed in writing to Hughes any interest in taking or using any
          Facilities used in the operations of the Business or any part thereof.
          The Company does not own any real estate.

                                      11
<PAGE>
 
     (b)  The Company has all permits, licenses and other authorizations
          required under applicable Governmental Regulations relating to
          pollution control and protection of the environment necessary for the
          operation of each of the Facilities. The Company is not in material
          violation of any of the terms or conditions of any such permits,
          licenses or authorizations or of any law or regulation, order or other
          requirement of Governmental Authorities with respect to the pollution
          of the atmosphere, surface water, groundwater, and noise; the handling
          of toxic or hazardous waste materials; or other matters related to the
          environment. There are no pending or, to the Knowledge of Hughes,
          threatened violations or administrative proceedings relating to
          pollution control or protection of the environment that would have a
          Material Adverse Effect.

     (c)  Past disposal by the Company (or its predecessors) of hazardous or
          industrial wastes has not given rise to claims by any Governmental
          Agency or third party nor is there any factual basis for any such
          claims.

     (d)  To the Knowledge of Hughes, there are no conditions, circumstances,
          activities, practices, incidents, actions or plans which would be
          reasonably likely to interfere with or prevent compliance or continued
          compliance by the Company with any environmental laws currently in
          force or with any existing regulation, code, order, decree, judgment,
          injunction, notice or demand letter issued, entered, promulgated or
          approved thereunder, or which may give rise to any common law or other
          legal liability on the part of the Company, including liability under
          the Comprehensive Environmental Response, Compensation and Liability
          Act ("CERCLA") or similar Governmental Regulations, or otherwise form
          the basis of any claim, action, demand, suit, proceeding, hearing,
          notice of violation, study or investigation, based on or related to
          the manufacture, processing, distribution, use, treatment, storage,
          disposal, transport or handling, or the emission, discharge, release
          or threatened release into the workplace or the environment, of any
          pollutant, contaminant, chemical, or industrial, toxic or hazardous
          material, substance or waste. Without in any way limiting the
          foregoing, no release, emission or discharge to the environment of any
          hazardous substance (as that term is currently defined under CERCLA or
          under any applicable analogous state law) has occurred or is

                                      12
<PAGE>
 
          currently occurring in connection with the conduct of the Company's
          Business.

     (e)  The Company has no successor or other liability or obligation, either
          accrued, absolute, contingent or otherwise, for any environmental
          related taxes, charges or any other expense set forth in the Property
          Tax, Indemnity or Surrender provisions of the lease agreements dated
          March 17, 1982 and July 11, 1983 between Sytek, Inc. and Shoreline
          Investments V, and there is no existing basis for any such liability
          or obligation in the future.

     3.8  Title to Properties.
          ------------------- 

     (a)  Except as disclosed in Schedule 3.8(a) of the Hughes Disclosure 
                                 --------------- 
          Schedule, the Company has good and marketable title to all of its
          Assets subject to no Liens except Permitted Liens. The Company has
          performed all the obligations required to be performed by it with
          respect to all Assets leased by it through the date hereof, except
          where the failure to perform would not have a Material Adverse Effect.
          The Assets are shown on the Company's books of account at or below
          actual cost less an adequate and proper depreciation charge, as
          described in Schedule 3.8(a) of the Hughes Disclosure Schedule.  The 
                       ---------------              
          Company has not depreciated any of the Assets in any manner materially
          inconsistent with applicable Internal Revenue Service guidelines, if
          any.

     (b)  The Company's inventories as shown on the Company Financial Statements
          (before deduction of reserves) are owned by the Company, except for
          sales made subsequent to the date of the Company Financial Statements
          in the ordinary course of business, for all of which either the
          purchaser has made full payment or the purchaser is obligated to make
          payment and such obligation is an asset of the Company in accordance
          with generally accepted accounting principles consistently applied.
          Except as set forth in Schedule 3.8(a) of the Hughes Disclosure 
                                 ---------------
          Schedule, the Company has good and marketable title to such inventory,
          free and clear of any and all Liens other than Permitted Liens. All
          inventories, whether or not reflected on the Company Financial
          Statements, have been produced or acquired in the ordinary course of
          business in accordance with the Company's normal inventory practices.

     (c)  Except as set forth in Schedule 3.8(c) of the Hughes Disclosure 
                                 ---------------
          Schedule, all accounts receivable, whether or not reflected on the 

                                      13
<PAGE>
 
          Company Financial Statements, have arisen only in the ordinary course
          of business in accordance with the Company's normal credit policies.

     3.9  Material Contracts.
          ------------------ 

     (a)  Schedule 3.9(a) of the Hughes Disclosure Schedule is a true and 
          ---------------    
          complete list of all contracts, agreements, purchase orders, leases,
          commitments or bids to which the Company is a party and which: (i)
          provide for payments in excess of $100,000 after February 28, 1995
          (including payments on options, if exercised, or bids, if accepted) by
          or to the Company, (ii) are employment, consulting, sales
          representative or distributorship agreements, (iii) are joint venture,
          partnership or teaming agreements, (iv) are borrowing or lending
          agreements, guarantees or comfort letters, (v) are leases of real or
          personal property, (vi) relate primarily to Intellectual Property, or
          (vii) are outside the ordinary course of the Business (collectively,
          "Material Agreements").

     (b)  Except as disclosed in Schedule 3.9(b) of the Hughes Disclosure 
                                 ---------------
          Schedule, there is not under any of the Material Agreements any
          existing default, event of default or other event which, with or
          without due notice or lapse of time or both, would constitute a
          default or event of default on the part of the Company, except such
          defaults, events of default or other events which, individually or in
          the aggregate, would not have a Material Adverse Effect. The Material
          Agreements have been duly authorized, executed and delivered by the
          Company and, to the Knowledge of Hughes, the other parties thereto;
          and, to the Knowledge of Hughes, each Material Agreement is in full
          force and effect and constitutes the legal, valid and binding
          agreement of the parties thereto, enforceable in accordance with its
          terms.

     (c)  True and complete copies of all the Material Agreements have been
          provided or made available to Whittaker.

     3.10 Licenses and Copyrights.
          ----------------------- 

     (a)  Schedule 3.10(a) of the Hughes Disclosure Schedules lists all patents,
          ----------------                                                      
          patent applications, trademarks, trade names, and registered
          copyrights owned by the Company. Except as set forth in Schedule
                                                                  --------
          3.10(a) of the Hughes Disclosure Schedule the Company is not required
          -------
          to pay any royalty, license, fee or similar 

                                      14
<PAGE>
 
          type of compensation in connection with the conduct of its business as
          it is now or heretofore has been conducted.

     (b)  Except as set forth on Schedule 3.10(b) of the Hughes Disclosure 
                                 ----------------     
          Schedule, the Company owns or has the right to use all trademarks,
          trade secrets, trade names, copyrights, processes, designs, formulas,
          know-how, inventions, licenses and intellectual property rights used
          in connection with its Business and the same are sufficient to conduct
          such Business as it is now or heretofore has been conducted with no
          asserted conflict with or infringement of the asserted or actual
          rights of others, to the Knowledge of Hughes (including, solely for
          purposes of this Section 3.10(b), the actual knowledge of W. Denson-
          Low, G. Lindeen and T. Gudmestad). Except as set forth on Schedule
                                                                    --------
          3.10(b) of the Hughes Disclosure Schedule, to the Knowledge of Hughes,
          -------
          there exists no infringement by any third party of any of the
          foregoing and the Company has not taken or omitted to take any action
          which would have the effect of waiving any of its rights thereunder,
          in each case except where such infringement or waiver would not have a
          Material Adverse Effect. To the Knowledge of Hughes and, except as set
          forth in Schedule 3.10(b) of the Hughes Disclosure Schedule, no third 
                   ----------------       
          party has filed or been issued or granted any applications for
          patents, trademarks, trade names, or registered copyrights relating to
          the Company's Intellectual Property.

     (c)  It is the Company's policy that all employees of the Company enter
          into appropriate confidentiality agreements, copies of which have been
          provided to Whittaker. Reference is made to Schedule 3.10(c) of the
                                                      ----------------    
          Hughes Disclosure Schedule.

     3.11  Financial Statements; Accounts.
           ------------------------------ 

     (a)  Hughes has delivered to Whittaker the financial statements included in
          Schedule 3.11(a) of the Hughes Disclosure Schedule (collectively, 
          ----------------                                             
          "Company Financial Statements").  Except as disclosed in such 
          Schedule 3.11(a) or in the Company Financial Statements, the Company 
          ----------------      
          Financial Statements have been prepared in accordance with generally
          accepted accounting principles consistently applied and maintained
          throughout the periods indicated and present fairly the financial
          condition of the Company as at their respective dates and the results
          of operations of the Company for the periods then ended.

                                      15
<PAGE>
 
     (b)  The books, records and accounts of the Company accurately and fairly
          reflect, in reasonable detail, the transactions and dispositions of
          assets of the Company.

     (c)  To the Knowledge of Hughes, the Company has no liabilities or
          obligations, either accrued, absolute, contingent or otherwise, except
          as reflected, or reserved against, in the Company Financial Statements
          or set forth in Schedule 3.11(c) of the Hughes Disclosure Schedule and
                          ----------------     
          (i) such liabilities or obligations as have arisen in the ordinary
          course of the Company's Business since December 25, 1994 (which will
          be reflected in Intercompany Advances or in the Final Statement of
          Working Capital, to the extent not paid), or (ii) such other
          liabilities or obligations, not required to be reflected or reserved
          against in the Company Financial Statements, as will not have, singly
          or in the aggregate, a Material Adverse Effect.

     (d)  Except as provided for in the Company Financial Statements or in the
          Final Statement of Working Capital, the Company has no material
          liability with respect to any employee benefit plan or arrangement no
          longer in effect whether maintained by the Company, by Sytek, Inc. or
          other Affiliated Company, including pension or thrift plans,
          individual or supplemental pension or accrued compensation
          arrangements, contribution to hospitalization or other health or life
          insurance programs, incentive plans, bonus arrangements, and vacation,
          sick leave, disability, and termination arrangements or policies, and
          workers' compensation policies.

     (e)  There are no retirement, savings or welfare plans created under or
          subject to the laws of a jurisdiction other than a state or territory
          of the United States of America in which employees of the Company
          participate.

     3.12 Personnel; Employee Benefit Plans.
          --------------------------------- 

     (a)  Schedule 3.12(a) of the Hughes Disclosure Schedule includes a 
          ----------------                                       
          description of all employee benefit plans or arrangements still in
          effect and which are applicable to the current or former employees of
          the Company including pension or thrift plans, individual or
          supplemental pension or accrued compensation arrangements,
          contributions to hospitalization or other health or life insurance
          programs, incentive plans, bonus arrangements, and vacation, sick

                                      16
<PAGE>
 
          leave, disability, and termination arrangements or policies, and
          workers' compensation policies (collectively, the "Company Plans").

     (b)  The Company and the Company Plans are in compliance in all material
          respects with those provisions of ERISA and the Code which are
          applicable to the Company Plans. No transaction proscribed by Section
          406 of ERISA or Section 4975 of the Code, and no reportable event as
          described in Section 4043(b) of ERISA, has occurred with respect to
          any Company Plan. The Company is not, and has not since the
          Acquisition Date been, an employer with respect to any multiemployer
          plan as defined in Section 4001(a)(3) of ERISA or Section 414(f) of
          the Code.

     (c)  The Company is in compliance in all material respects with all
          applicable Governmental Regulations relating to the employment of
          labor including those related to wages, hours, collective bargaining
          and discrimination, and there are no unfair labor practice claims or
          charges pending or, to the Knowledge of Hughes, threatened relating to
          the employees of the Company.

     3.13 Claims and Legal Actions.  Except as disclosed in Schedule 3.13 of
          ------------------------                          -------------   
the Hughes Disclosure Schedule, there is no claim, legal action, counterclaim,
suit, arbitration, governmental investigation, or other legal, administrative or
tax proceeding, nor any order, decree or judgment, in progress or pending, or,
to the Knowledge of Hughes, threatened, against or relating to the Company that,
if adversely determined, would have a Material Adverse Effect.

     3.14 Compliance with Laws.  In its operation of the Business, the Company
          --------------------                                                
has complied and is complying with all Governmental Regulations, except where
the failure to so comply would not have a Material Adverse Effect.

     3.15 Hazardous Materials.  Except in compliance with applicable
          -------------------                                       
Governmental Regulations, no release, emission or discharge to the environment
of any Hazardous Materials has occurred in connection with the conduct of the
Business by the Company.

     3.16 Taxes.  Since the Acquisition Date and, to the Knowledge of Hughes,
          -----                                                              
prior thereto, the Company (or each affiliated, combined or unitary group of
which the Company is or was a member) has duly and timely filed all federal,
state, local and foreign returns in respect of Taxes and all reports and other
information required and requested to be filed by it by Governmental Authorities
with respect to Taxes, and each such return, report or other 

                                      17
<PAGE>
 
information is true, complete and accurate in all material respects. The Company
has paid, or has made provision in the Company Financial Statements or in the
Final Statement of Working Capital for, all Taxes since the Acquisition Date.
The Company has not filed a consent under Section 341(f) of the Code with
respect to any assets or property held by the Company. The Company is not a
party to any tax-sharing agreement or similar arrangement which will remain in
effect after the Closing.

     3.17 Material Changes.  Since the date of the most recent balance sheet of
          ----------------                                                     
the Company listed in Schedule 3.11(a) of the Hughes Disclosure Schedule (the
                      ----------------                                       
"Balance Sheet Date"), except as disclosed in Schedule 3.17 of the Hughes
                                              -------------              
Disclosure Schedule, none of the following has occurred:  (a) any change in the
condition, assets, liabilities or Business which would result in a Material
Adverse Effect; (b) any damage or destruction in the nature of a casualty loss
which would result in a Material Adverse Effect; (c) issuance or sale by the
Company of any capital stock or securities convertible into capital stock of the
Company, or options or other rights therefor; (d) declaration or payment of any
dividend or other distribution by the Company; (e) other than in the ordinary
course of the Business (i) any purchase, sale, assignment, license, lease or
other disposition of any material assets or rights (including Intellectual
Property) or the creation of any Lien (other than Permitted Liens) on any
material assets or rights of the Company, (ii) any incurrence of any material
liability or obligation, (iii) any increase in the compensation payable to any
officer, employee or agent of the Company, other than normal periodic increases
consistent with past practice, or any changes in the Company Plans, except as
required by Governmental Regulations, or (iv) entry into, or termination or
material modification of, any Material Agreement, except in the ordinary course
of the Business consistent with past practice.

     3.18 Product Warranties.  Whittaker has been provided with a copy of the
          ------------------                                                 
standard product warranty currently extended by the Company with respect to its
products and services.  To the Knowledge of Hughes, there have not been any
written claims with respect to warranties on products or services provided in
the Business except for claims which, individually or in the aggregate, are not
reasonably expected to have a Material Adverse Effect, taking into account any
reserves for warranties included in the Company Financial Statements or in the
Final Statement of Working Capital.  Reference is made to Schedule 3.18 of the
                                                          -------------       
Hughes Disclosure Schedule.

     3.19 Advances and Related Party Transactions.  Except as set forth in
          ---------------------------------------                         
Schedule 3.19 of the Hughes Disclosure Schedule, (a) there are no receivables of
- -------------                                                                   
the Company owing by any directors, officers or employees of the Company, or by
Hughes or any of its subsidiaries, and (b) to the Knowledge of Hughes, no

                                      18
<PAGE>
 
director, officer or employee of the Company has, either directly or indirectly,
any interest in any Person which sells products or services to, or purchases
products or services from, the Company (except interests in Hughes or its
affiliates).

     3.20 Bank Accounts.  Schedule 3.20 of the Hughes Disclosure Schedule
          -------------   -------------                                  
contains a complete list of all the bank accounts of the Company, together with
the names of all Persons authorized to draw thereon.  Except as set forth in
such Schedule, all cash in such accounts is held on a demand deposit basis and
is not subject to any restriction or limitation as to withdrawal.

     3.21 Powers of Attorney.  Schedule 3.21 of the Hughes Disclosure Schedule
          ------------------   -------------                                  
contains a complete list of all powers of attorney (or similar instruments or
authorizations) granted by the Company to any Person.  Except as set forth in
such Schedule, all such powers of attorney (or similar instruments or
authorizations) are subject to termination or revocation by the Company at any
time, without notice to any other Person and without penalty.

     3.22 Insurance.  Schedule 3.22 of the Hughes Disclosure Schedule sets
          ---------   -------------                                       
forth a complete and correct list of all material insurance policies currently
in force with respect to Hughes and its subsidiaries, including the Company, in
connection with the Business.  The policies of insurance described are in full
force and effect and are valid, outstanding and enforceable, and all premiums
due thereon have been paid in full.

     3.23 Representations Regarding Note.  Hughes is acquiring the Note for its
          ------------------------------                                       
own account for investment, not as a nominee or agent, and not with a view to
the resale or distribution of the Note or any part thereof or participation
therein.  Hughes acknowledges that the offering and sale of the Note pursuant to
this Agreement will not be registered under the Securities Act or any state
securities or blue sky laws and that the Note may not be sold or offered for
sale without registration under the Securities Act and applicable state
securities laws unless an exemption from such registration is available.  Hughes
is an "accredited investor" within the meaning of Regulation D under the
Securities Act and is a "qualified institutional investor" as defined in Rule
144A under the Securities Act.  Hughes is not an investment company as that term
is defined in the Investment Company Act of 1940.

     3.24 Brokers' and Finders' Fees.  Except for Cowen & Company, any
          --------------------------                                  
compensation to which shall be the sole responsibility of Hughes and shall not
be chargeable to the Company, no Person acting on behalf of Hughes or the
Company or under the authority of either is or will be entitled to any brokers'
or finders' fee or any other commission or similar fee, directly or indirectly,
from any 

                                      19
<PAGE>
 
of the parties hereto in connection with any of the transactions contemplated
hereby.

                                  ARTICLE IV
                        REPRESENTATIONS AND WARRANTIES
                                 OF WHITTAKER

Whittaker represents and warrants to Hughes as follows, subject to the
exceptions, limitations and qualifications set forth in the Disclosure Schedule
attached hereto as Schedule IV (the "Whittaker Disclosure Schedule"):
                   -----------                                       

     4.1  Organization and Authority.  Whittaker is a corporation duly
          --------------------------                                            
organized, validly existing, and in good standing under the laws of the State of
Delaware and is qualified to do business as a foreign corporation in all states
where such qualification is necessary under applicable Governmental Regulations
and where the failure to be so qualified would cause a Material Adverse Effect.
Whittaker has full corporate power and authority to own its assets and to carry
on its business as now being conducted. Whittaker has full corporate power and
authority to enter into this Agreement and the Related Documents and to carry
out the transactions contemplated hereby and thereby.

     4.2  Authorization and Binding Obligation.  The Board of Directors of
          ------------------------------------                            
Whittaker has taken all action required  by law to authorize the execution and
delivery of this Agreement and the Related Documents and the transactions
contemplated hereby and thereby, and this Agreement is, and when executed by
Whittaker, each Related Document will be, a valid and binding obligation of
Whittaker enforceable against it in accordance with its terms, except as may be
limited by bankruptcy, insolvency, moratorium or other laws affecting creditors'
rights generally and subject to general principles of equity.

     4.3  Absence of Conflicting Agreements or Consents.  Neither the execution
          ---------------------------------------------                        
and delivery of this Agreement and the Related Documents nor the consummation of
the transactions contemplated hereby and thereby will (a) violate any provisions
of the Certificate of Incorporation or Bylaws of Whittaker, (b) subject to
Section 9.9, violate, or be in conflict with, or constitute a material default
under or cause the acceleration of the maturity of any debt or obligation
pursuant to, any material agreement or commitment to which Whittaker is a party
or by which Whittaker is bound, or (c) violate any Governmental Regulation
applicable to Whittaker.  No consent, approval or authorization of, or
declaration, filing or registration with, any Governmental Authority is required
in connection with the execution, delivery and performance of this Agreement or
the Related Documents by Whittaker and the consummation of the transactions

                                      20
<PAGE>
 
contemplated hereby and thereby, except as set forth in Schedule 4.3 of the
                                                        ------------       
Whittaker Disclosure Schedule (collectively, "Whittaker Consents").

     4.4  Capitalization.  The authorized capital stock of Whittaker consists of
          --------------                                                        
40,000,000 shares of common stock, par value $.01 per share ("Whittaker Common
Stock") and 5,000,000 shares of preferred stock, par value $1 per share
("Whittaker Preferred Stock").  Schedule 4.4 of the Whittaker Disclosure
                                ------------                            
Schedule accurately sets forth, as of the date of this Agreement, all of the
issued and outstanding shares of Whittaker Common Stock and of Whittaker
Preferred Stock, as well as all options, warrants, conversion privileges,
preemptive rights, rights of first refusal or other rights, agreements or
commitments which are presently outstanding to purchase any of the capital stock
of Whittaker.  Upon issuance of the Note to Hughes in accordance with this
Agreement, the Note will be duly authorized and validly issued and the requisite
number of shares of Whittaker Common Stock will have been reserved for issuance
upon conversion of the Note in accordance with such Note, and upon conversion of
all or part of the Note into Whittaker Common Stock in accordance with the Note,
if such conversion occurs, the shares of Whittaker Common Stock issued to Hughes
will be duly authorized, validly issued, fully paid and nonassessable and will
be free of preemptive or other similar rights.

     4.5  Financial Statements; Public Reports.  Whittaker has previously
          ------------------------------------                           
furnished Hughes true and complete copies of each report or proxy statement
filed by Whittaker with the SEC since January 1, 1994 (collectively, the "Public
Reports").  The consolidated financial statements and schedules of Whittaker
contained in such Public Reports (or incorporated therein by reference) were
prepared in accordance with generally accepted accounting principles applied on
a consistent basis except as noted therein and fairly present the consolidated
financial condition and results of operations of Whittaker and its subsidiaries
as at the respective dates thereof and for the periods indicated therein,
subject in the case of interim unaudited financial statements, to normal year-
end audit adjustments, none of which will be material.  The Public Reports do
not contain any untrue statement of a material fact or omit to state any
material fact necessary to make the statements therein, in light of the
circumstances in which they were made, not misleading.

     4.6  Claims and Legal Actions.  Except as disclosed in Schedule 4.6 of the
          ------------------------                          -------------      
Whittaker Disclosure Schedule, there is no claim, legal action, counterclaim,
suit, arbitration, governmental investigation, or other legal, administrative or
tax proceeding, nor any order, decree or judgment, in progress or pending, or,
to the Knowledge of Whittaker, threatened, against or relating to Whittaker or
any of its subsidiaries that, if adversely determined, would have a Material
Adverse Effect.

                                      21
<PAGE>
 
     4.7  Compliance with Laws.  Whittaker and its subsidiaries have complied
          --------------------                                               
and are complying with all Governmental Regulations, except where the failure to
so comply would not have a Material Adverse Effect.

     4.8  Taxes.  Whittaker (or each affiliated, combined or unitary group of
          -----                                                              
which Whittaker is or was a member) and its subsidiaries have duly and timely
filed all federal, state, local and foreign returns in respect of Taxes and all
reports and other information required and requested to be filed by any of them
by Governmental Authorities with respect to Taxes, and each such return, report
or other information is true, complete and accurate in all material respects.
Whittaker and its subsidiaries have paid, or have made provision included in the
Public Reports for, all Taxes.

     4.9  Material Changes.  Since the date of the most recent balance sheet of
          ----------------                                                     
Whittaker included in the Public Reports, none of the following has occurred:
(a) any change in the condition, assets, liabilities or business of Whittaker
which would result in a Material Adverse Effect; (b) any damage or destruction
in the nature of a casualty loss which would result in a Material Adverse
Effect; (c) issuance or sale by Whittaker of any capital stock or securities
convertible into capital stock of Whittaker, or options or other rights
therefor; (d) declaration or payment of any dividend or other distribution by
Whittaker; (e) other than in the ordinary course of the business of Whittaker
(i) any purchase, sale, assignment, license, lease or other disposition of any
material assets or rights (including Intellectual Property) or the creation of
any Lien (other than Permitted Liens) on any material assets or rights of
Whittaker or (ii) any incurrence of any material liability or obligation.

     4.10 Representations Regarding Stock.  Whittaker is acquiring the Stock
          -------------------------------                                   
for its own account for investment, not as a nominee or agent, and not with a
view to the resale or distribution of the Stock or any part thereof.  Whittaker
acknowledges that the offering and sale of the Stock pursuant to this Agreement
will not be registered under the Securities Act or any state securities or blue
sky laws and that the Stock may not be sold or offered for sale without
registration under the Securities Act and applicable state securities laws
unless an exemption from such registration is available.  Whittaker is an
"accredited investor" within the meaning of Regulation D under the Securities
Act.  Whittaker is not an investment company as that term is defined in the
Investment Company Act of 1940.

     4.11 Brokers' and Finders' Fees.  Except for the firm of McCray Shriver
          --------------------------                                        
Eckdahl & Associates, Inc., any compensation to which shall be the sole
responsibility of Whittaker, no Person acting on behalf of Whittaker or any of
its subsidiaries or under the authority of the foregoing is or will be entitled
to any 

                                      22
<PAGE>
 
brokers' or finders' fee or any other commission or similar fee, directly or
indirectly, from any of the parties hereto in connection with any of the
transactions contemplated hereby.

                                   ARTICLE V
                            MUTUAL ACKNOWLEDGMENTS
                           REGARDING REPRESENTATIONS

     5.1  Survival of Representations and Warranties.  All representations and
          ------------------------------------------                          
warranties made by any party in this Agreement or in any Related Document shall
survive the Closing, but all claims made after the Closing with respect to any
such representations and warranties shall be made under, and subject to the
limitations set forth in, Article XII, which shall be the exclusive remedy after
Closing for any such claim.

     5.2  Exclusion of other Representations.  Each party acknowledges that it
          ----------------------------------                                  
has sufficient knowledge and expertise in business and financial matters to
evaluate the merits and risks associated with the transactions contemplated by
this Agreement  Each party has made its decision to enter into this Agreement
and to consummate the transactions provided for herein without relying upon any
express or implied representations, warranties, commitments or undertakings of
any other party, or such other party's directors, officers, employees, agents,
representatives or affiliates, except as expressly set forth in this Agreement
and in the Related Documents.

                                  ARTICLE VI
                              CONDUCT OF BUSINESS
                              PENDING THE CLOSING

     6.1  Conduct of Business by the Company.  Hughes covenants and agrees that
          ----------------------------------                                   
between the date hereof and the Closing Date, Hughes shall cause the Company to
conduct the Business in the ordinary course, and, except as contemplated by this
Agreement or with the prior written consent of Whittaker (which shall not be
unreasonably withheld or delayed), Hughes shall cause the Company to conduct the
Business in accordance with the following:

     (a)  Hughes shall cause the Company not to enter into any Material
          Agreement or amend or terminate any existing Material Agreement in any
          material respect, except that the Company may renew or extend any
          existing Material Contract on the same or modified terms in the
          ordinary course of business.

                                      23
<PAGE>
 
     (b)  Hughes shall cause the Company not to create, assume or permit to
          exist any Lien on any material Assets, except Permitted Liens.

     (c)  Hughes shall cause the Company not to sell, assign, lease, or
          otherwise transfer or dispose of any of the Assets except in the
          ordinary course of business or in connection with the acquisition of
          replacement property.

     (d)  Hughes shall cause the Company not to increase the compensation,
          retirement, or other benefits or bonuses payable or to become payable
          to any employee of the Business, except for increases substantially in
          accordance with existing employment practices of the Company or in
          accordance with employment agreements existing on the date hereof as
          described in Schedule 6.1(d).
                       ----------------

     (e)  Hughes shall cause the Company to give to Whittaker and its counsel,
          accountants and other authorized representatives reasonable access
          (subject to the Company's normal security procedures and any
          applicable attorney-client privilege) during normal business hours to
          the Company and to the books and records relating to the Business, and
          will furnish or cause to be furnished to Whittaker and its authorized
          representatives all information relating to the Company as they may
          reasonably request; provided, however, that (a) in each instance
          mutually satisfactory arrangements for such inspection shall be made
          in advance (including, without limitation, prior written notice to
          Hughes), and (b) the rights of Whittaker under this Section 6.1(e)
          shall not be exercised in any manner that interferes unreasonably with
          the operation of the Business.

     (f)  Whittaker shall be entitled to review transactions and significant
          matters related to the conduct of the Business.

     6.2  Conduct of Whittaker's Business.  Whittaker covenants and agrees that
          -------------------------------                                      
between the date hereof and the Closing Date, Whittaker shall conduct its
business in the ordinary course and shall not, without the consent of Hughes
(which consent will not be unreasonably withheld or delayed), take any action
which would cause Whittaker to breach its representations in Section 4.9.

                                      24
<PAGE>
 
                                  ARTICLE VII
                        OTHER COVENANTS OF THE PARTIES
                           PENDING THE CLOSING DATE

     7.1  HSR Act Filings.  As promptly as practicable after the execution of
          ---------------                                                    
this Agreement, each party shall, or shall cause its ultimate parent to, file
any reports or notifications that may be required to be filed under the HSR Act
with the Federal Trade Commission and the Antitrust Division of the U.S.
Department of Justice, and shall cooperate in connection with such filings or
responses to requests for additional information.

     7.2  No Shopping, Etc.  From the date hereof until the Closing Date or
          ----------------                                                 
termination of this Agreement, Hughes will not, and will cause the Company not
to, directly or indirectly, through any officer, director, agent or otherwise,
solicit, initiate or encourage submission of proposals or offers from any Person
relating to any acquisition or purchase of any equity interest in, or all or
(other than in the ordinary course of business) a portion of the Assets of the
Company or any business combination with the Company, or participate in any
negotiations regarding or furnish to any other Person any information with
respect to, or otherwise cooperate in any way with, or assist or participate in,
facilitate or encourage, any effort or attempt by any other Person to do or seek
any of the foregoing, except for the transactions provided for in this
Agreement.  Hughes will not sell or otherwise transfer any of the Stock except
as contemplated hereby, and will not vote the Stock in favor of, or otherwise
approve, any merger, consolidation, asset acquisition or other takeover
transaction involving the Company.

     7.3  Consents.  Each party shall use its commercially reasonable efforts to
          --------                                                              
obtain as soon as practicable all Consents to be obtained by it, and agrees to
cooperate reasonably with the other party in its efforts to obtain the Consents
applicable to such other party.  Whittaker shall, at Hughes's request, promptly
furnish Hughes with copies of any documents and information concerning Whittaker
that may be reasonably requested by any Person in connection with any Consent of
such Person to the transfer of the Stock.  Neither Whittaker nor Hughes shall be
required to undertake extraordinary or unreasonable measures to obtain any
Consents, including, without limitation, requiring Whittaker or Hughes to make
any expenditures.

     7.4  Cooperation.  The parties shall cooperate fully with each other in
          -----------                                                       
connection with any actions required to be taken as part of their obligations
under this Agreement, and the parties will endeavor in good faith to consummate
the transactions contemplated hereby.  Without limiting the generality of the
foregoing, Whittaker shall use its best efforts to obtain any required consent
of 

                                      25
<PAGE>
 
the banks which are parties to its Credit Agreement dated as of January 23, 1995
among Whittaker Corporation, as Borrower, and Nationsbank of Texas, N.A., as
Agent, and the other parties thereto ("Whittaker Credit Agreement").

     7.5  Supplements to Disclosure Schedule.  From time to time prior to the
          ----------------------------------                                 
Closing Date, each party may supplement or amend the Schedules attached hereto
with respect to any matter hereafter arising that, if existing or occurring at
or prior to the date of this Agreement, would have been required to be set forth
or described in the Schedules or in any representation and warranty of such
party that has been rendered inaccurate thereby.  For purposes of Article IX and
X, the Schedules delivered by each party shall be deemed to include only that
information contained therein on the date of this Agreement and shall be deemed
to exclude any information contained in any subsequent supplement or amendment
thereto.

     7.6  Confidentiality Agreement.  Notwithstanding execution of this
          -------------------------                                    
Agreement, the Confidentiality Agreement shall remain in full force and effect.
All information provided to Whittaker or its Representatives (as that term is
used in the Confidentiality Agreement) will be treated in accordance with the
Confidentiality Agreement.

     7.7  Cash Management, Forgiveness of Intercompany Advances.
          ------------------------------------------------------

     (a)  As part of the cash management program of Hughes and its affiliates,
          the Company maintains separate disbursement checking accounts which
          are funded by Hughes, all of which are listed in Schedule 3.20 of the
                                                           -------------  
          Hughes Disclosure Schedule. At the close of each business day, the
          cash balances of the Company are transferred to Hughes or an
          Affiliated Company, with certain limited exceptions in the case of
          accounts maintained outside the United States. Up to and including
          April 16, 1995 (the "Cutoff Date"), Hughes or an Affiliated Company
          will continue to fund the Company's disbursement checking accounts and
          will be entitled to continue to receive all cash balances of the
          Company, in each case in the ordinary course of business consistent
          with past practice. Effective as of the close of business on the
          Cutoff Date, Hughes shall make an Intercompany Advance to the Company
          in an amount equal to any then outstanding checks issued on the
          Company's accounts which have not cleared on or before the Cutoff
          Date. Such final Intercompany Advance shall be included in the cash of
          the Company in determining its Working Capital in accordance with
          Section 1.6, to the extent that the associated outstanding checks are
          still treated as liabilities of the Company in 

                                      26
<PAGE>
 
          determining Working Capital as provided in Section 1.6. From the
          Cutoff Date through the Closing Date, Hughes shall have no obligation
          to make further Intercompany Advances and shall have no right to
          receive cash balances of the Company.

     (b)  At December 25, 1994, the Company owed Hughes the sum of
          $81,430,695.17 in respect of intercompany advances made by Hughes in
          the ordinary course of business (and excluding amounts owed for goods
          or services provided by Hughes or its affiliates to the Company in the
          ordinary course of business) to fund the Company's ongoing operations
          or capital requirements (the "Intercompany Advances"). As of the
          Closing Date, all Intercompany Advances which are then outstanding
          will be contributed to the capital of the Company by Hughes. Hughes
          will have no continuing obligation, after the Cutoff Date, to make any
          Intercompany Advances to the Company. Whittaker will assume the
          obligation to fund the Company's ongoing operations or capital
          requirements (including outstanding checks) as of the Closing Date.

                                 ARTICLE VIII
                            POST-CLOSING COVENANTS

     8.1  Access to Books and Records.  For a period of ten (10) years after the
          ---------------------------                                           
Closing, Whittaker shall retain, and make available for inspection and
duplication by Hughes (at Hughes' expense and upon request during normal
business hours), all files, records, and books of account relating to the
Company.  Whittaker shall not destroy any such books and records after the
expiration of such ten-year period without affording Hughes an opportunity to
review, copy or take custody of such books and records.

     8.2  Tax Matters.
          ----------- 

     (a)  Except to the extent such Indemnified Taxes are covered by reserves
          reflected on the Company Financial Statements or in the Final
          Statement of Working Capital, Hughes shall be liable for, and shall
          indemnify and hold harmless Whittaker and the Company with respect to,
          any and all Indemnified Taxes that may be imposed on or in respect of
          the Company with respect to (i) all taxable periods ending on or prior
          to the Closing Date, and (ii) all Income Taxes allocated to Hughes
          pursuant to subsection (b) of this Section 8.2. For purposes of clause
          (i) above, the liability of Hughes shall include, without limitation,
          any liability for Income 

                                      27
<PAGE>
 
          Taxes arising out of the inclusion (or termination of the inclusion)
          of the Company in a consolidated, combined or unitary tax return filed
          by Hughes or any of its affiliates, any liability for Income Taxes
          relating to the merger, reorganization and related transactions by
          which the business, operations and properties of the Company was
          acquired by Hughes, and any liability for Income Taxes relating to the
          issuance, cancellation and contribution to capital of the Intercompany
          Advances pursuant to Section 7.7(b). The indemnification set forth in
          this Section 8.2 shall not be subject to the limitations set forth in
          Article XII, except as otherwise provided in Section 12.4(b) or
          12.4(d).

     (b)  Indemnified Taxes imposed on or in respect of the Company for any
          taxable period that includes the Closing Date shall be allocated to
          and paid by (i) Hughes for the period up to and including the Closing
          Date to the extent such amount exceeds the reserves therefor as
          reflected on the Final Statement of Working Capital, and (ii)
          Whittaker for the period up to and including the Closing Date (to the
          extent of the reserves therefor as reflected on the Final Statement of
          Working Capital) and for the period subsequent to the Closing Date.
          For purposes of the preceding sentence, the Income Taxes for the
          period up to and including the Closing Date and for the period
          subsequent to the Closing Date shall be determined on the basis of an
          interim closing of the books of the Company as of the Closing Date.

     (c)  Any refunds (including interest thereon) of Income Taxes paid or
          indemnified by Hughes pursuant to Section 8.2(a) and (b) above shall
          be for the account of Hughes. Any refunds (including interest thereon)
          of Income Taxes paid by Whittaker pursuant to Section 8.2(b) above
          shall be for the account of Whittaker. Whittaker agrees to assign and
          promptly remit (and to cause the Company to assign and promptly remit)
          to Hughes all refunds (including interest thereon) of Income Taxes
          which Hughes is entitled to hereunder and which are received by
          Whittaker, the Company, or any affiliate of Whittaker. Hughes agrees
          to assign and promptly remit (and to cause its affiliates to assign
          and promptly remit) to Whittaker all refunds (including interest
          thereon) of Income Taxes which Whittaker is entitled to hereunder and
          which are received by Hughes or any of its affiliates. Whittaker
          agrees that, upon the reasonable request and at the sole expense of
          Hughes, Whittaker shall file, or cause the Company to file, a claim
          for refund of any Income Tax which Hughes is entitled to hereunder.
          Hughes 

                                      28
<PAGE>
 
          agrees that, upon the reasonable request and at the sole expense of
          Whittaker, Hughes shall file, or cause its affiliates to file, a claim
          for refund of any Income Taxes which Whittaker is entitled to
          hereunder.

     8.3  Covenant Not to Interfere with Business.
          --------------------------------------- 

     (a)  Hughes agrees that, for a period of two years after the Closing Date,
          neither Hughes nor any of its subsidiaries, shall, directly or
          indirectly cause, induce or encourage any of the officers or employees
          of the Company to leave their employ; provided, however, that this
          subparagraph (a) shall not preclude Hughes or its subsidiaries from
          hiring any such Person following termination of their employment by
          the Company or following voluntary resignation of any such Person
          without affirmative solicitation by Hughes or its Subsidiaries or
          their affiliates nor any general employment advertising not directed
          at the employees of the Company.

     (b)  On the Closing Date, Whittaker and Hughes shall execute and deliver
          the Non-Competition Agreement substantially in the form attached as
          Exhibit 8.3(b).
          -------------- 

     8.4  Employee Matters.
          ---------------- 

     (a)  Whittaker has advised Hughes that it is Whittaker's present intention
          to continue to employ the current employees of the Company and to make
          available to such employees the benefit plans described in Schedule
                                                                     --------
          8.4(a); provided, however, that it is understood that Whittaker 
          ------
          retains the right to conduct its business, and the business of the
          Company after the Closing, as deemed prudent by Whittaker, including
          changes in employment levels or terms of employment. Without limiting
          the generality of the preceding sentence, Whittaker acknowledges that,
          as of the Closing Date, it will assume the rights and obligations of,
          and will continue, the Hughes LAN Systems Retirement Savings Plan for
          the benefit of the persons employed by the Company from time to time,
          subject to the right of Whittaker to modify or amend, or terminate,
          such plan after the Closing Date, in accordance with such plan and
          applicable Governmental Regulations.

     (b)  Any present or former employees of the Company shall cease as of the
          Closing Date to participate in any employee benefit plan or

                                      29
<PAGE>
 
          arrangement sponsored by Hughes as specified in Schedule 8.4(b),
                                                          --------------- 
          except as disclosed in such Schedule. Whittaker shall not assume any
          liability or obligation under any such plan or arrangement. However,
          Whittaker or the Company, and not Hughes, will be responsible for
          benefits under the plans applicable to the Company's employees as of
          the Closing Date, as specified in Schedule 8.4(a).  Without limiting 
                                            ---------------
          the generality of the foregoing, Whittaker shall cause such plans to
          waive preexisting conditions or other exclusions on immediate coverage
          for such employees as of the Closing Date, and such plans will be
          responsible for claims submitted after the Closing, while the Hughes
          plans specified in Schedule 8.4(b) will be responsible for claims
                             ---------------                               
          submitted prior to Closing.

     (c)  Hughes has adopted the Retention Plan for Key Employees of the Company
          attached as Exhibit 8.4(c) (the "Retention Plan"). Subject to the
                      -------------- 
          terms and conditions of the Retention Plan, Whittaker shall pay, or
          cause the Company to pay, in each case on behalf of Hughes, the
          amounts owing to each key employee specified in the Retention Plan,
          and shall also pay all associated withholding or other Taxes in
          respect of such payments to the key employees, including the
          employer's share of such Taxes. The aggregate amount actually paid by
          Whittaker or the Company to the key employees on behalf of Hughes in
          accordance with the Retention Plan, together with the associated
          withholding or other Taxes in respect of such payments (the "Key
          Employee Payments") shall be reimbursed by Hughes to Whittaker within
          30 days after receipt by Hughes of notice from Whittaker that it has
          made any Key Employee Payments, which notice shall specify the amount
          of such Key Employee Payments and when and to whom paid. The Key
          Employee Payments represent a liability of Hughes which is being
          assumed by Whittaker (subject to reimbursement by Hughes as provided
          herein), as part of the consideration for the Stock.

     (d)  Nothing contained in this Agreement, express or implied, shall confer
          upon any employee of the Company any rights or remedies including any
          right to employment or continued employment or right to benefits or
          payments for any specified period, of any nature or kind whatsoever.

                                      30
<PAGE>
 
     8.5  Transitional Services and Continuing Business Relationships.
          ----------------------------------------------------------- 

     (a)  On the Closing Date, Whittaker, the Company and Hughes shall execute
          and deliver the Transitional Services Agreement substantially in the
          form attached as Exhibit 8.5(a).
                           -------------- 

     (b)  Schedule 8.5(b) of the Hughes Disclosure Schedule sets forth certain
          ---------------                                                     
          relationships between Hughes and the Company. The administrative and
          other services provided by Hughes to the Company, as described in such
          Schedule, will continue to be provided by Hughes after the Closing
          Date in accordance with the Transitional Services Agreement.

     (c)  Hughes and the Company are parties to that certain Corporate
          Procurement Agreement No. 3566 effective the 19th day of March 1990,
          as amended (the "Hughes/HLS CPA"). On the Closing Date, such
          Hughes/HLS CPA shall be amended to extend the term of such agreement
          through 31 March 1998. Hughes further agrees that, from and after the
          Closing Date and so long as the Hughes/HLS CPA remains in effect, the
          Company shall be a preferred vendor of Hughes so that, if the
          Company's products and services are competitive with or superior to
          comparable products and services of the Company's competitors, in
          terms of price, quality, availability and other relevant factors,
          Hughes will give preference to the Company in determining the source
          of supply for required products and services to be purchased by or for
          Hughes, subject to the terms and conditions of the Hughes/HLS CPA.

     8.6  Releases.  As promptly as possible following the Closing, Whittaker
          --------                                                           
shall use its best efforts to procure the release of Hughes and each of its
affiliates from all guarantees, indemnities, contracts of suretyship, letters of
credit, support letters or similar arrangements and third-party charges or
security interests given in respect of the Company, if any (the "Hughes
Contingent Obligations").  Whittaker shall indemnify and hold harmless Hughes
and its affiliates from the Hughes Contingent Obligations or from the failure of
the Company to perform after the Closing under any of the contracts or other
obligations underlying the Hughes Contingent Obligations.

     8.7  Intellectual Property.  At Closing, Hughes, Whittaker and the Company
          ---------------------                                                
shall enter into an Intellectual Property Agreement substantially in the form
attached hereto as Exhibit 8.7.
                   ----------- 

     8.8  Audit of Company Financial Statements.  Promptly after the Closing
          -------------------------------------                             
Date, but in any event within the period specified under the Exchange 

                                      31
<PAGE>
 
Act (as such period may be extended upon application to the SEC), Hughes, at its
expense, shall cause Deloitte & Touche to audit the financial statements of the
Company for the three year period required under Regulation S-X of the Exchange
Act. Whittaker shall cause the Company to cooperate in the preparation and
review of such audited financial statements, including providing full and
complete access to its personnel, books and records, and causing the appropriate
officers of the Company to sign and deliver to Deloitte & Touche such management
representation letters as Deloitte & Touche may request in accordance with its
customary practices. All administrative or other internal costs and expenses
incurred by Whittaker or the Company in connection with such audit shall be
borne by Whittaker or the Company.

     8.9  Compliance with Contingent Payment Obligations.  After the Closing,
          ----------------------------------------------                     
Whittaker shall comply, and shall cause the Company to comply, with the
covenants and other obligations set forth in Exhibit 1.3(c).
                                             -------------- 

     8.10 Change of Name.  Within five days after the Closing Date, Whittaker
          --------------                                                     
shall cause the Company to file an amendment to its Articles of Incorporation or
other appropriate documents that change the Company's corporate name to
"Whittaker Communications, Inc." and shall thereafter file such name change with
all the appropriate governmental authorities of the jurisdictions where the
Company is incorporated or qualified or licensed to do business.  From and after
the Closing Date, Whittaker will cause the Company to cease all use of the name
of "Hughes", "GMHE", "General Motors", "GM" or any combination thereof as a
trademark, service mark or in any other manner; provided, however, for a
transition period not to exceed one hundred and eighty (180) days, Whittaker and
the Company may use such printed forms, including purchase orders, invoices and
like documents, packaging materials, and promotional literature displaying such
trademarks, trade names, or service marks so long as such items are over-printed
or otherwise indicate the Company's change in control and provide the Company's
current name; and, provided, further, that the Company may continue to sell its
finished goods or other items which bear the "Hughes" name at the Closing Date,
in the ordinary course of business, subject to the indemnity obligations of
Whittaker under Section 12.2(c).

                                  ARTICLE IX
                     CONDITIONS TO WHITTAKER'S OBLIGATIONS

The obligation of Whittaker to effect the transactions contemplated herein shall
be subject to the satisfaction, on or before the Closing Date, of each of the
following conditions:

                                      32
<PAGE>
 
     9.1  Representations and Warranties.  All representations and warranties of
          ------------------------------                                        
Hughes contained in this Agreement shall be true and complete in all material
respects on and as of the Closing Date as though made on and as of that date,
except for (a) changes contemplated by this Agreement, or (b) changes that arise
after the date hereof in the ordinary course of business.

     9.2  Covenants.  Hughes shall have performed and complied in all material
          ---------                                                           
respects with all covenants required by this Agreement to be performed or
complied with by it prior to or on the Closing Date.

     9.3  Consents.  All Hughes Consents shall have been obtained and delivered
          --------                                                             
to Whittaker, except any such Consent with respect to which Hughes has agreed to
indemnify and reimburse Whittaker for any cost or expense resulting from the
failure of the Hughes Consent to have been obtained (without the limitations
provided in Article XII) or, in the case of a Consent to the assignment of any
Material Agreement, Hughes has taken other steps so that Whittaker will be
afforded the benefits to be conferred by such Contract.

     9.4  Governmental Authorizations.  There shall not have been any
          ---------------------------                                
modification, revocation or nonrenewal of any of the Governmental Licenses that
would have a Material Adverse Effect.

     9.5  Certificate.  Hughes shall have delivered to Whittaker a certificate,
          -----------                                                          
dated as of the Closing Date, executed on behalf of Hughes by an appropriate
officer of Hughes, certifying (a) that the representations and warranties of
Hughes contained in this Agreement are true and complete in all material
respects as of the Closing Date as though made on and as of the Closing Date,
except for (i) the changes contemplated by this Agreement, or (ii) changes that
arose in the ordinary course of business, and (b) that Hughes has in all
material respects performed and complied with all of the covenants in this
Agreement to be performed and complied with by it on or prior to the Closing
Date.

     9.6  Deliveries.  Hughes shall have made or stand willing to make all the
          ----------                                                          
deliveries to Whittaker described in Section 1.4, and shall have executed or
stand willing to execute the agreements described in Sections 8.3(b), 8.5(a),
8.5(c) and 8.7.

     9.7  No Injunction.  Neither Hughes nor Whittaker shall be subject on the
          -------------                                                       
Closing Date to any order, decree or injunction of a court of competent
jurisdiction which enjoins or prohibits the consummation of this Agreement.

                                      33
<PAGE>
 
     9.8  Expiration of Waiting Period.  The waiting period under the HSR Act
          ----------------------------                                       
shall have expired or early termination of such waiting period shall have been
granted.

     9.9  Bank Approval.  Whittaker shall have obtained the written approval of
          -------------                                                        
the banks which are parties to the Whittaker Credit Agreement for the
transactions contemplated by this Agreement, to the extent such approval is
required.

                                   ARTICLE X
                       CONDITIONS TO HUGHES' OBLIGATIONS

The obligation of Hughes to effect the transactions contemplated herein shall be
subject to the satisfaction, on or before the Closing Date, of each of the
following conditions:

     10.1 Representations and Warranties.  All representations and warranties
          ------------------------------                                     
of Whittaker contained in this Agreement shall be true and complete in all
material respects on and as of the Closing Date as though made on and as of that
date.

     10.2 Covenants.  Whittaker shall have performed and complied in all
          ---------                                                     
material respects with all covenants required by this Agreement to be performed
or complied with by it prior to or on the Closing Date.

     10.3 Certificate.  Whittaker shall have delivered to Hughes a certificate,
          -----------                                                          
dated as of the Closing Date, executed on behalf of Whittaker by an appropriate
officer, certifying (a) that the representations and warranties of Whittaker
contained in this Agreement are true and complete in all material respects as of
the Closing Date as though made on and as of that date, and (b) that Whittaker
has in all material respects performed and complied with all of the covenants in
this Agreement to be performed and complied with by it on or prior to the
Closing Date.

     10.4 Deliveries.  Whittaker shall have made or stand willing to make all
          ----------                                                         
the deliveries described in Section 1.5, and shall have executed or stand
willing to execute the agreements described in Section 8.3(b), 8.5(a) and 8.7.

     10.5 Consents.  All Whittaker Consents shall have been obtained.
          --------                                                   

     10.6 No Injunction.  Neither Hughes nor Whittaker shall be subject on the
          -------------                                                       
Closing Date to any order, decree or injunction of a court of competent
jurisdiction which enjoins or prohibits the consummation of this Agreement.

                                      34
<PAGE>
 
     10.7 Expiration of Waiting Period.  The waiting period under the HSR Act
          ----------------------------                                       
shall have expired or early termination of such waiting period shall have been
granted.

                                  ARTICLE XI
                          TERMINATION AND ABANDONMENT

     11.1 Termination.  Subject to the provisions in Section 11.2, this
          -----------                                                  
Agreement may, by written notice given prior to the Closing, be terminated and
abandoned as follows:

     (a)  By either Hughes or Whittaker, if a material default or breach shall
          be made by the other party with respect to the timely performance of
          any of its obligations contained herein or with respect to any of its
          representations and warranties herein, and such default cannot be
          cured and has not been waived;

     (b)  By Hughes, if all of the conditions set forth in Article X shall not
          have been satisfied or waived on or before April 30, 1995, other than
          through failure of Hughes to fully comply with its obligations
          hereunder; or by Whittaker, if all of the conditions set forth in
          Article IX shall not have been satisfied or waived on or before April
          30, 1995, other than through failure of Whittaker to fully comply with
          its obligations hereunder;

     (c)  By mutual consent of Hughes and Whittaker; or

     (d)  By either Hughes or Whittaker, if the Closing shall not have occurred,
          other than through a failure of such party to fulfill its obligations
          hereunder, on or before April 30, 1995, or such later date as may be
          agreed upon by the parties.

     11.2 Effect of Termination.  If this Agreement is terminated pursuant to
          ---------------------                                              
Section 11.1, this Agreement shall become void and of no further force and
effect, except for the following provisions, which shall remain in full force
and effect:  (a)  this Section 11.2;  (b) such provisions in Article XIII as
shall continue to be applicable following termination including Sections 13.1,
13.5, 13.10 and 13.11;  and (c) the Confidentiality Agreement.  Notwithstanding
the foregoing, if this Agreement is terminated by one party because of another
party's failure to fulfill its obligations hereunder, it is expressly agreed and
understood that the terminating party's right to pursue all remedies for breach
of contract or 

                                      35
<PAGE>
 
otherwise, including damages relating thereto, shall also survive such
termination (subject to the limitations in Section 12.7(b)).

                                  ARTICLE XII
                                   INDEMNITY

     12.1 Indemnification by Hughes.  Subject to the qualifications and
          -------------------------                                    
limitations in this Article XII, if the Closing is consummated Hughes shall
indemnify and hold Whittaker harmless against and with respect to, and shall
reimburse Whittaker for, any and all Damages reasonably and proximately incurred
by Whittaker as a result of any of the following:

     (a)  any inaccuracy or misrepresentation in or breach of any representation
          or warranty of Hughes in this Agreement or any of the Related
          Documents;

     (b)  the breach or failure by Hughes to perform after the Closing Date any
          of its covenants or agreements under this Agreement or any of the
          Related Documents;

     (c)  any failure of Hughes or the Company to comply with any Governmental
          Regulation which relates to the pollution or protection of the
          environment applicable to the Facilities or the conduct of the
          Business prior to the Closing, and any condition at any Facility or at
          any location at which the Company or Sytek, Inc. conducted the
          Business giving rise to any Damages under any such Governmental
          Regulation relating to the pollution or protection of the environment
          currently or heretofore in effect; and

     (d)  any Government Contract Claim arising as a result of actions or events
          occurring or arising out of the conduct of the Business prior to the
          Closing, whether or not such Government Contract Claims would
          constitute a breach of the representations in Section 3.6.

     12.1AInfringement Indemnification by Hughes.  In addition to the general
          --------------------------------------                             
indemnification provided in Section 12.1, subject to the qualifications and
limitations in this Article XII, if the Closing is consummated Hughes shall
indemnify and hold Whittaker harmless against and with respect to, and shall
reimburse Whittaker for, the following (without duplication of the
indemnification provided in Section 12.1):

     (a)  any and all Damages reasonably and proximately incurred by Whittaker
          as a result of any product sold or produced by the

                                      36
<PAGE>
 
          Company prior to the Closing Date infringing any patent issued to any
          third party;

     (b)  one-half of any and all Damages reasonably and proximately incurred by
          Whittaker as a result of any product sold by the Company (other than
          those produced by the Company prior to the Closing Date) within two
          years after the Closing Date, which product is the same as products
          which have been produced by the Company prior to the Closing Date,
          infringing any patent issued to any third party; and

     (c)  any and all lost profits reasonably and proximately suffered by
          Whittaker as a result of any breach by Hughes of the representations
          in the first sentence of Section 3.10(b).

     12.2 Indemnification by Whittaker .  Subject to the qualifications and
          -----------------------------                                    
limitations in this Article XII, if the Closing is consummated Whittaker shall
indemnify and hold Hughes harmless against and with respect to, and shall
reimburse Hughes for, any and all Damages reasonably and proximately incurred by
Hughes as a result of the following:

     (a)  any inaccuracy or misrepresentation in or breach of any representation
          or warranty of Whittaker in this Agreement or any of the Related
          Documents;

     (b)  the breach or failure by Whittaker to perform after the Closing Date
          any of its respective covenants or agreements under this Agreement or
          any of the Related Documents; and

     (c)  the operation or ownership of the Company or the Business (including,
          without limitation, the Company's performance or failure to perform
          under its Material Agreements) on and after the Closing Date.

     12.3 Procedure for Indemnification.  The procedure for indemnification
          -----------------------------                                    
shall be as follows:

     (a)  The party claiming indemnification ("Claimant") shall promptly give
          notice of any claim for which indemnification will be sought ("Claim")
          to the party from which indemnification is sought ("Indemnitor") of
          its Claim, whether solely between the parties or brought by a third
          party, specifying in reasonable detail the factual basis for the Claim
          and, to the extent known, the amount of the Claim. Notwithstanding the
          foregoing, the failure by the Claimant 

                                      37
<PAGE>
 
          to provide timely notice of any Claim, or any delay in providing such
          notice, shall not affect or impair the obligations of Indemnitor
          hereunder, except and only to the extent that Indemnitor has been
          adversely affected by such failure or delay.

     (b)  With respect to Claims between the parties, following receipt of
          notice from the Claimant of a Claim, the Indemnitor shall have sixty
          (60) days to make any investigation of the Claim that the Indemnitor
          deems necessary or desirable. For the purposes of this investigation,
          the Claimant agrees to make available to the Indemnitor and its
          authorized representatives the information relied upon by the Claimant
          to substantiate the Claim. If the Claimant and the Indemnitor cannot
          agree as to the validity and amount of the Claim within the sixty (60)
          day period (or any mutually agreed upon extension thereof), the
          Claimant may seek appropriate legal remedy.

     (c)  With respect to any Claim by a third party as to which the Claimant is
          entitled to indemnification hereunder, the Indemnitor shall have the
          right at its own expense to participate in or assume control of the
          defense of the Claim, and the Claimant shall cooperate fully with the
          Indemnitor, subject to reimbursement for actual out-of-pocket expenses
          incurred by the Claimant as the result of a request by the Indemnitor.
          If the Indemnitor elects to assume control of the defense of any 
          third-party Claim, the Claimant shall have the right to participate in
          the defense of the Claim at its own expense. If the Indemnitor does
          not elect to assume control or otherwise participate in the defense of
          any third party Claim within thirty (30) days of its receipt of notice
          of the Claim (or any extended period mutually agreed upon by the
          parties), the Claimant shall (upon further written notice to
          Indemnitor) have the right to undertake the defense, compromise or
          settlement of the Claim for the account of Indemnitor subject to the
          right of Indemnitor, at its expense, to assume the defense of the
          Claim at any time prior to final settlement, compromise or
          determination thereof. In no event shall Indemnitor be liable or
          otherwise have any obligation with respect to any settlement,
          compromise or determination of any Claim agreed to by Claimant without
          the prior written consent of Indemnitor (which shall not be withheld
          unreasonably), unless Indemnitor shall have failed or refused to
          assume control of the defense as provided above or shall have
          unreasonably withheld consent to such settlement, compromise or
          determination.

                                      38
<PAGE>
 
     (d)  The parties shall cooperate in defending any third party Claim, and
          the defending party shall have reasonable access to the books, records
          and personnel which are pertinent to the defense and which are in
          control of the other party.

     12.4 Limitations and Conditions Applicable to Whittaker.  The right of
          --------------------------------------------------               
Whittaker to indemnification pursuant to Section 12.1 or Section 12.1A of this
Agreement is subject to the following limitations:

     (a)  Whittaker shall not be entitled to indemnification (i) with respect to
          any individual Claim, unless the Damages arising from such Claim
          exceed $5,000, and (ii) with respect to all Claims, until the
          aggregate Damages for which Hughes is liable under Section 12.1 or
          Section 12.1A exceed Seven Hundred Fifty Thousand Dollars ($750,000),
          whereupon Whittaker shall be entitled to indemnification by Hughes for
          all of its Damages excluding Damages arising from any individual Claim
          which are $5,000 or less. It is understood that the limitations in
          this Section 12.4(a) shall not be considered in determining whether
          any representation or warranty has been breached.

     (b)  Except as provided in Section 12.10, Whittaker shall not be entitled
          to indemnification for that amount of its aggregate Damages for which
          Hughes is liable under Section 8.2, Section 12.1 or Section 12.1A
          which is in excess of the amount of consideration actually paid by
          Whittaker to Hughes for the Stock, consisting of the Cash Payment, the
          principal amount of the Note and the aggregate amount of any
          Contingent Payments received by or payable to Hughes (collectively,
          the "Aggregate Consideration").

     (c)  No Claim shall be brought by Whittaker against Hughes under Section
          12.1(a) or Section 12.1A(c) unless notice in writing of such Claim
          shall have been given to Hughes in accordance with Section 12.3(a) on
          or prior to the date which is thirty (30) days after the completion of
          the consolidated audited financial statements of Whittaker and its
          subsidiaries for the fiscal year ending October 31, 1996, except (i)
          with respect to any Claims for breach of the representations of Hughes
          in Sections 3.2, 3.4, 3.6, 3.7(b), (c), (d) and (e), the first
          sentence of 3.8(a), 3.12(b), and 3.23, as to which no time limit shall
          apply, and (ii) with respect to any Claims for the breach of the
          representations in Section 3.16, as to which the time limit shall be
          the applicable statute of limitations.

                                      39
<PAGE>
 
     (d)  Hughes shall not be liable for any Damages to the extent that: (i)
          provision or reserve was made in the Company Financial Statements or
          in the Final Statement of Working Capital for the matter giving rise
          to the Claim; (ii) any amount which is claimed by Whittaker has been
          written off as unrecoverable in the Company Financial Statements or in
          the Final Statement of Working Capital; or (iii) the Damages arise
          from a change in the accounting or Tax policies or practices of
          Whittaker or the Company after the Closing Date.

     12.5 Limitations Applicable to all Parties.  Neither party shall have any
          -------------------------------------                               
liability to another party under this Article XII for Damages to the extent
that:

     (a)  the Claimant recovers or has a right to recover insurance proceeds
          covering the Damages in connection with such Claim other than where
          the relevant premiums for the relevant policy have been paid by the
          Claimant;

     (b)  such Claim relates to a liability or matter with respect to which
          Claimant has either made recovery from a Person other than Indemnitor
          or has a right of recovery from such a Person which it has failed to
          pursue diligently;
 
     (c)  Claimant had Knowledge of the breach of the representation, warranty
          or obligation giving rise to the Claim, or otherwise had Knowledge of
          the basis for the Claim, prior to the consummation of the Closing;

     (d)  Claimant's liability for the taxable year in which the Damages which
          forms the basis for the Claim are sustained is actually reduced due to
          a tax benefit to which Claimant becomes entitled in respect of the
          Damages; or

     (e)  the Damages would not have arisen but for a voluntary act, omission or
          transaction after the Closing Date by Claimant or at the request of
          Claimant.

     12.6 Other Matters.
          ------------- 

     (a)  No party shall be entitled to recover Damages in respect of any Claim
          or otherwise obtain reimbursement or restitution more than once with
          respect to any Claim hereunder.

                                      40
<PAGE>
 
     (b)  If Indemnitor makes any payment pursuant to this Article XII or
          otherwise by reason of the transactions contemplated by this Agreement
          or the Related Documents under any theory of recovery, Indemnitor
          shall be subrogated, to the extent of such payment and to the extent
          permitted by law, to any rights and remedies of Claimant to recoup
          amounts paid from third parties with respect to the matters giving
          rise to indemnification hereunder. Claimant shall, and shall cause its
          affiliates to, fully cooperate with Indemnitor in connection with
          Indemnitor's rights hereunder.

     (c)  If Indemnitor fails to make any payment of Damages when incurred by
          Claimant, the amount not so paid shall bear interest at the Default
          Rate from the date incurred by Claimant until the date paid by
          Indemnitor.

     12.7 Remedies Exclusive.
          ------------------ 

     (a)  The remedies provided in this Article XII shall be exclusive as to any
          Claims by a party under this Agreement or any Related Document or
          arising out of the transactions provided for herein and therein and
          shall preclude assertion by any party of any other rights or the
          seeking of any other remedies against another party; provided,
          however, that nothing in this Section 12.7(a) shall limit rights or
          remedies expressly provided for in this Agreement or any Related
          Document or rights or remedies which, as a matter of applicable law or
          public policy, cannot be limited or waived.

     (b)  IN NO EVENT SHALL EITHER PARTY HAVE ANY LIABILITY, WHETHER BASED ON
          CONTRACT, TORT (INCLUDING NEGLIGENCE), WARRANTY OR ANY OTHER LEGAL OR
          EQUITABLE GROUNDS, FOR ANY LOST PROFITS, LOST SAVINGS, INCIDENTAL
          DAMAGES, INDIRECT DAMAGES, SPECIAL, PUNITIVE OR CONSEQUENTIAL DAMAGES
          INCURRED BY THE OTHER PARTY (COLLECTIVELY, "CONSEQUENTIAL DAMAGES"),
          OTHER THAN CONSEQUENTIAL DAMAGES OWING TO THIRD PARTIES, ARISING FROM
          OR RELATED TO THIS AGREEMENT OR ANY RELATED DOCUMENT OR THE
          TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY, EXCEPT AS OTHERWISE
          EXPRESSLY PROVIDED IN THIS AGREEMENT OR A RELATED DOCUMENT.

                                      41
<PAGE>
 
     12.8 Repurchase Option.  If, at any time, Whittaker shall have asserted
          -----------------                                                 
against Hughes Claims for Damages which are equal to or greater than the
Aggregate Consideration, Hughes shall have the option to repurchase the Stock
from Whittaker for an amount equal to the Aggregate Consideration minus the
aggregate amount of any Damages previously paid by Hughes to Whittaker (the
"Option Payment") by written notice to Whittaker delivered within 90 days after
receipt by Hughes of such Claims.  If Hughes exercises such option, Whittaker
shall deliver to Hughes the certificate evidencing the Stock, duly endorsed or
accompanied by an appropriate assignment, free of all Liens, against payment of
the Option Payment by Hughes to Whittaker in immediately available funds to an
account specified by Whittaker.  In connection with such repurchase, the Note
shall be canceled and discharged and Whittaker shall be released from any
liability for Contingent Payments.

     12.9 Treatment of Indemnity Payments.  Except as otherwise required by
          -------------------------------                                  
law, all payments made by Hughes or Whittaker, as the case may be, to or for the
benefit of the other party pursuant to any indemnification obligations under
this Agreement or any Related Document shall be treated as adjustments to the
purchase price of the Stock for tax purposes and such agreed treatment shall
govern for purposes of this Agreement.

     12.10 Setoff.
           ------ 

     (a)  Notwithstanding Section 12.4(b), if and to the extent that Hughes
          fails or refuses to pay Whittaker amounts owing by Hughes to Whittaker
          under this Article XII, as evidenced by a written acknowledgment of
          Hughes or by a final nonappealable order of a court of competent
          jurisdiction or of the arbitrators appointed pursuant to Section
          13.11, then Whittaker shall be entitled to setoff the amount owing by
          Hughes to Whittaker as set forth above against any payment then or
          thereafter due and owing by Whittaker to Hughes in respect of the
          Contingent Payments or under the Note; provided, however, that (a)
          Whittaker shall provide ten days prior notice of such proposed setoff,
          and (b) the amount to be setoff shall be applied first against any
          Contingent Payments, second against interest owing on the Note and
          last against the unpaid principal balance of the Note; provided,
          however, that if Hughes shall have transferred the Note, or any
          portion thereof as permitted by the Note, to a person other than an
          Affiliated Company, such right of setoff shall no longer apply to the
          portion so transferred, although Whittaker's right to be indemnified
          by Hughes as provided herein shall not be impaired or affected by any
          such transfer.

                                      42
<PAGE>
 
     (b)  Hughes shall be entitled to satisfy indemnity obligations to Whittaker
          under this Article XII first, by application against any amounts then
          owing by Whittaker to Hughes and, if such amounts are not sufficient,
          by payment of immediately available funds to such account as shall be
          specified by Whittaker. However, if, at the time Hughes is required to
          make any indemnity payment, an Event of Default (as defined in the
          Note) has occurred and is continuing, then Hughes, at its option, may
          satisfy indemnity obligations to Whittaker under this Agreement by
          application against the unpaid principal amount or interest accrued
          but unpaid on the Note. Such application shall be effected by delivery
          of the Note by Hughes to the Company for discharge of that portion of
          the Note which represents the amount of any indemnity obligation then
          owing by Hughes to Whittaker, with written instructions from Hughes to
          Whittaker to effect such discharge and the amount to be so discharged.
          Whittaker shall promptly reissue the Note in the proper amount, taking
          into account such discharge, and shall deliver such Note to Hughes or
          as it directs, all in accordance with the provisions of the Note.

                                 ARTICLE XIII
                           MISCELLANEOUS PROVISIONS

     13.1 Fees and Expenses.  Except as otherwise provided in this Agreement,
          -----------------                                                  
each party shall pay its own expenses incurred in connection with the
authorization, preparation, execution and performance of this Agreement and the
Related Documents, including, without limitation, all fees and expenses of
counsel, accountants, agents and representatives.  Without limiting the
foregoing, each of Hughes and Whittaker shall pay all commissions, finder's fees
or similar payments due to any broker, finder or investment banker retained by
such party in connection with the transactions contemplated by this Agreement.
Nothing herein shall constitute an admission by either party that any such
payments are due to any Person.

     13.2 Notices.  All notices, demands and requests required or permitted to
          -------                                                             
be given under the provisions of this Agreement shall be in writing.  Such
notices shall be delivered in the manner provided below, and addressed as
follows:

                                      43
<PAGE>
 
If to Hughes:   Hughes Aircraft Company
                7200 Hughes Terrace
                M/S A171
                Los Angeles, California 90045
                Attention:  K. N. Heintz, Vice President - Corporate Development
                Telecopy No.:  (310) 568-6774

with a copy to: Hughes Aircraft Company
                7200 Hughes Terrace
                M/S A114
                Los Angeles, California  90045
                Attention:  L. D. Hunter
                Telecopy No.:  (310) 568-7834

If to Whittaker:(Until August 1, 1995)
                Whittaker Corporation
                10880 Wilshire Boulevard
                Los Angeles, California 90024
                Attention:  Richard Levin, Chief Financial Officer and
                General Counsel
                Telecopy No.:  (213) 879-9442

                (After August 1, 1995)
                1995 N. Surveyor Avenue
                Simi Valley, California  93063
                Attention Richard Levin, Chief Financial Officer and
                General Counsel
                Telecopy No.:  (To be provided by Whittaker)

or to any other or additional persons and addresses as the parties may from time
to time designate in a writing delivered in accordance with this Section 13.2.
A notice personally delivered shall be deemed to have been duly delivered upon
receipt thereof.  A notice mailed by registered or certified mail, postage
prepaid and return receipt requested, shall be deemed to have been duly
delivered and received on the date of receipt shown on the return receipt.  Any
notice sent by telecopier shall be confirmed by telephone as soon as practicable
after sending (and shall be deemed to have been duly delivered and received upon
such confirmation) and the original of such notice shall be personally delivered
or mailed.

     13.3 Benefit and Binding Effect.  Neither party hereto may assign this
          --------------------------                                       
Agreement without the prior written consent of the other party hereto.  This

                                      44
<PAGE>
 
Agreement shall be binding upon and inure to the benefit of the parties hereto
and their respective successors and permitted assigns.

     13.4 Further Assurances.  The parties shall take any actions and execute
          ------------------                                                 
any other agreements or documents that may be necessary or desirable to the
implementation and consummation of this Agreement.

     13.5 Governing Law.  This Agreement shall be governed, construed and
          -------------                                                  
enforced in accordance with the laws of the State of California (without regard
to the choice of law provisions thereof).

     13.6 Headings.  The headings herein are included for ease of reference
          --------                                                         
only and shall not control or affect the meaning or construction of the
provisions of this Agreement.

     13.7 Gender and Number.  Words used herein, regardless of the gender and
          -----------------                                                  
number specifically used, shall be deemed and construed to include any other
gender, masculine, feminine or neuter, and any other number, singular or plural,
as the context requires.

     13.8 Entire Agreement.  This Agreement, all Schedules and Exhibits hereto,
          ----------------                                                     
and all agreements, certificates, and other documents to be delivered by the
parties pursuant hereto, collectively represent the entire understanding and
agreement between Whittaker and Hughes with respect to the subject matter
hereof.  This Agreement supersedes all prior and contemporaneous discussions,
negotiations, communications, agreements and understandings between the parties
(except the Confidentiality Agreement) and cannot be amended, supplemented or
changed except by an agreement in writing that makes specific reference to this
Agreement and which is signed by the party against which enforcement of any such
amendment, supplement or modification is sought.

     13.9 Counterparts.  This Agreement may be signed in counterparts with the
          ------------                                                        
same effect as if the signature on each counterpart were upon the same
instrument.

     13.10 Public Announcements.  The parties agree (a) to consult with each
           --------------------                                             
other before issuing any press release or making any public statement with
respect to this Agreement or the transactions contemplated hereby, and (b)
except as may be required by Governmental Regulations, not to issue any press
release or public statement without the prior written consent of the other
party.

                                      45
<PAGE>
 
     13.11 Dispute Resolution.
           ------------------ 

          (a)  Except as otherwise expressly provided herein, all disputes,
     claims or controversies ("Disputes") that arise under or with respect to
     this Agreement or any Related Document, or the performance or breach hereof
     or thereof, shall, to the extent not resolved by amicable negotiation
     between the parties, be settled and finally determined by binding
     arbitration conducted in accordance with the Commercial Arbitration Rules,
     or the then existing rules for commercial arbitration, of the American
     Arbitration Association. Any arbitration proceedings shall be held in Los
     Angeles, California.

          (b)  If either party determines at any time that it wishes to submit a
     Dispute to arbitration, it shall first give the other party notice, in
     reasonable detail, of the Dispute and of the intention to submit the
     Dispute to arbitration. If, within 30 days after receipt of such notice by
     the other party (or such longer period as the parties may establish at the
     time), the Dispute is not resolved by amicable negotiation between the
     parties, such Dispute may be submitted by either party to arbitration as
     provided herein.

          (c)  The arbitration shall be before a panel of three (3) arbitrators.
     Each party shall select an arbitrator and both parties shall jointly select
     the third arbitrator; provided, however, if the parties are unable to agree
     on the third arbitrator within 30 days after the Dispute is submitted to
     arbitration, the two arbitrators selected by the parties shall jointly
     select the third arbitrator. The arbitrators shall only interpret and apply
     the terms and provisions of this Agreement and any other Related Document
     at issue, shall not change any such terms or provisions or deprive any
     party to the Dispute of any right or remedy provided for in this Agreement
     or such Related Document and, to the extent practicable, shall,
     notwithstanding their rules, apply California law to the resolution of
     legal issues. The arbitrators may award compensatory damages against a
     party to the Dispute but the arbitrators shall not be authorized to award,
     nor shall they award, Consequential Damages, except as expressly permitted
     in this Agreement or such Related Document. The arbitration of any Dispute,
     including the determination of any amount of damages suffered by a party,
     shall be final and binding upon the parties to the maximum extent permitted
     by law. Judgment upon the decision of the arbitrators may be entered in any
     court of competent jurisdiction. The costs and expenses of each party
     incurred in connection with the arbitration, including reasonable
     attorneys' fees, costs and expenses, and the costs of the arbitration
     itself, including the fees, costs and expenses of 

                                      46
<PAGE>
 
     the arbitrators, shall be borne in accordance with the determination of the
     arbitrators with respect thereto.

          (d)  The requirement that Disputes shall be submitted to arbitration
     as provided in this Section 13.11 shall not apply to the following:

               (i)   If a party to a Dispute, having given the other party at
          least ten days notice of the other party's breach, in good faith seeks
          immediate equitable relief from a court of competent jurisdiction to
          enable the instituting party to prevent irreparable harm (alleged to
          arise from the alleged breach) pending arbitral relief (it being
          understood that, except for the issues giving rise to equitable
          relief, the Dispute shall be subject to arbitration as provided
          herein);

               (ii)  To any Dispute arising with respect to payment obligations
          under the Note;

               (iii) To any claim by one party to the Dispute against the other
          party which arises out of the subject matter of any court litigation
          or proceeding commenced by any third party against one party in which
          the other party is an indispensable party or third party defendant;

               (iv)  To any claim which is asserted with respect to a third
          party, which is not bound and will not, upon request of a party, agree
          to be bound by this Section 13.11, and which is an indispensable or
          necessary party to the Dispute; or

               (v) To the resolution of any Disputes under Section 1.6.

          (e) This Section 13.11 shall survive termination of this Agreement.

     13.12 Acknowledgment.  The parties each acknowledge that all the terms and
           --------------                                                      
conditions in this Agreement and the Related Documents have been the subject of
active and complete negotiation between the parties and represent the parties'
agreement based upon all relevant considerations.  The parties agree that the
terms and conditions of this Agreement and the Related Documents shall not be
construed in favor of or against any party by reason of the extent to which any
party or its professional advisors participated in the preparation hereof or
thereof.

                                      47
<PAGE>
 
IN WITNESS WHEREOF, this Agreement has been executed by the duly authorized
officers of Whittaker and Hughes as of the date first written above.


"Hughes"                                  "Whittaker"

HUGHES AIRCRAFT COMPANY                   WHITTAKER CORPORATION
 

By  Kenneth N. Heintz                  By  Richard Levin          
   ----------------------------           ----------------------------
Its V.P. Corporate Dev.                Its V.P. & C.F.O.      
   ----------------------------           ----------------------------

                                      48
<PAGE>
 
                               Omitted Schedules
                               -----------------


          The following is a list of schedules attached to Exhibit 2 which have
been omitted.  The Registrant undertakes to furnish a copy of any omitted
schedule to the Commission upon request.

Schedule 2.2                               Defined Terms

Schedule III                               Hughes Disclosure Schedule
<PAGE>
 
                                                                  EXHIBIT 1.3(B)
                                                                  --------------


                  THIS NOTE HAS NOT BEEN REGISTERED UNDER THE
                  SECURITIES ACT OF 1933, AS AMENDED, OR ANY 
                  STATE BLUE SKY OR SECURITIES LAW.  NO SALE, 
                  TRANSFER, ASSIGNMENT, HYPOTHECATION OF THIS 
                  NOTE OR ANY INTEREST HEREIN MAY BE EFFECTED 
                  EXCEPT IN COMPLIANCE WITH SUCH LAWS AND THE 
                  OTHER REQUIREMENTS PROVIDED IN THIS NOTE.  
                  THIS NOTE IS SUBORDINATED TO CERTAIN SENIOR
                  INDEBTEDNESS, IN THE MANNER AND TO THE EXTENT 
                  SET FORTH HEREIN.



                             WHITTAKER CORPORATION
                       7% Convertible Subordinated Note
                                due May 1, 2005


No. ___

$15,000,000                                              Los Angeles, California
                                                                 April ___, 1995

     FOR VALUE RECEIVED, WHITTAKER CORPORATION, a Delaware corporation (as
further defined below, the "Company"), promises to pay to HUGHES AIRCRAFT
COMPANY, a Delaware corporation ("Hughes"), or registered assigns, the principal
sum of Fifteen Million Dollars ($15,000,000), plus interest thereon, all as
provided in this 7% Convertible Subordinated Note due May 1, 2005 (the "Note",
and together with any notes issued upon transfer or exchange hereof pursuant to
Section 9, the "Notes"). This Note represents a portion of the consideration
paid to Hughes at the Closing under the Stock Purchase Agreement dated as of
March 23, 1995, between the Company and Hughes (as amended from time to time,
the "Stock Purchase Agreement").

     The Company covenants and agrees as follows:

1.   Definitions.  For purposes of this Note, the following terms shall have the
     -----------                                                                
following meanings:

     "Affiliate" of any specified Person means any other Person directly or
     indirectly controlling or controlled by or under direct or indirect common
     control with such specified Person. For the purposes of this definition,
     "control" when used with respect to any Person means the power to direct
     the management and policies of such Person, directly or indirectly, whether
     through the ownership of voting 
<PAGE>
 
     securities, by contract or otherwise; and the terms "controlling" and
     "controlled" have meanings correlative to the foregoing.

     "Bankruptcy Law" means Title 11, U.S. Code, or any similar United States
     federal or state law for the relief of debtors.

     "Business Day" means any day other than a Saturday, a Sunday or a day on
     which commercial banks in Los Angeles, California are not required to be
     open for banking business generally.

     "Capital Stock" means any and all shares, equity interests, equity
     participations or other equivalents (however designated) of corporate
     stock.

     "Change in Control" means any of the following with respect to the Company:
     
          (a)  a Person or "group" (within the meaning of Sections 13(d) and
          14(d)(2) of the Exchange Act) becoming the "beneficial owner" (as
          defined in Rule 13(d)(3) of the Exchange Act) of shares of Common
          Stock and any other shares of Capital Stock of the Company which have
          the right to vote on the election of any member of the Board of
          Directors of the Company, in circumstances where such Person or group
          (i) owns or is entitled to direct the disposition of and (ii) is
          entitled to exercise voting rights in respect of, an aggregate number
          of such shares representing more than 50% of the total voting power of
          all outstanding such shares, unless such beneficial ownership is
          approved by the Board of Directors of the Company prior to such
          acquisition; or

          (b)  a change in the Board of Directors of the Company in which the
          individuals who constituted the Board of Directors of the Company at
          the date of original issuance of this Note (together with any other
          director whose election by the Board of Directors of the Company or
          whose nomination for election by the stockholders of the Company has
          been approved by a majority (including any successors so approved) of
          the individuals constituting the Board of Directors of the Company at
          the date of original issuance of this Note) cease for any reason to
          constitute a majority of the Board of Directors of the Company.

     "Common Stock" means the common stock, $.01 par value, of the Company.

     "Company" means Whittaker Corporation, a Delaware corporation, unless and
     until a successor entity shall replace the Company as obligor hereunder,
     pursuant to the terms of this Note and thereafter shall mean such
     successor.

     "Custodian" means any receiver, trustee, assignee, liquidation,
     sequestrator or similar official under any Bankruptcy Law.

                                      -2-
<PAGE>
 
     "Default" means any event which is, or after notice or passage of
     time or both would be, an Event of Default.

     "Default Rate" means a floating rate per annum equal on any day to the sum
     of (a) the prime rate as most recently published in The Wall Street
                                                         --- ---- ------ 
     Journal, plus (b) two percent (2%).
     -------  
 
     "Event of Default" shall have the meaning provided in Section 8.1.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended.

     "GAAP" means generally accepted accounting principles as in effect in the
     United States of America at the time such principles are being applied
     pursuant to this Note.

     "Holder" means Hughes, and following any transfers or exchanges hereof
     pursuant to Section 9, "Holders" shall mean the holders of Notes registered
     in the Note Register maintained by the Company pursuant to Section 9.2.

     "Indebtedness" of any Person means at any date, without duplication (a) all
     obligations of such Person for borrowed money, (b) all obligations of such
     Person evidenced by bonds, debentures, notes or other similar instruments,
     (c) all obligations of such Person in respect of letters of credit or other
     similar instruments (or reimbursement obligations with respect thereto)
     which are issued pursuant to credit arrangements with banks or other
     financial institutions and which, if honored, will result in obligations
     for borrowed money, (d) to the extent not otherwise included, obligations
     arising under agreements or arrangements of such Person in connection with
     credit facilities with banks or other financial institutions which have
     been entered into to protect such Person from the effect of currency or
     interest rate fluctuations, and (e) all obligations of other Persons of the
     type described in clauses (a) through (d) above, which are guaranteed by
     such Person.

     "Investment Company Act" means the Investment Company Act of 1940, as
     amended.

     "Material Subsidiary" means, at any time, a Subsidiary whose assets at such
     time exceed 5% of the assets of the Company and the Subsidiaries (on a
     consolidated basis).

     "Maturity Date" means May 1, 2005.

                                      -3-
<PAGE>
 
     "Officer" means the Chairman of the Board, the President, any Vice
     President, the Chief Financial Officer, the Treasurer, the Secretary or the
     Controller of the Company.

     "Officers' Certificate" means a certificate signed by two Officers or by an
     Officer and either an Assistant Treasurer or an Assistant Secretary of the
     Company.

     "Opinion of Counsel" means a written opinion from legal counsel who, (i) in
     the case of an Opinion of Counsel to the Company, is reasonably acceptable
     to the Holder and (ii) in the case of an Opinion of Counsel to the Holder,
     is reasonably acceptable to the Company. The counsel may be internal
     counsel to the Company or to the Holder.

     "Person" means an individual, a corporation, an association, a partnership,
     a limited liability company, a trust or estate, a joint stock company, an
     unincorporated organization, a joint venture, a trade or business (whether
     or not incorporated), a governmental authority or any other entity.

     "Redeemable Capital Stock" means any Capital Stock of the Company that by
     its terms, or by the terms of any security into which it is convertible or
     exchangeable, is, or upon the happening of an event or the passage of time
     would be, required to be redeemed, or at the option of the holder
     repurchased, in whole or in part, by the Company or any of its
     Subsidiaries, or matures or would mature upon the happening of an event or
     the passage of time, or has, or upon the happening of an event or the
     passage of time would have, a sinking fund payment due, on or prior to the
     Maturity Date.

     Redemption Date" when used with respect to any Note to be redeemed or
     repurchased by the Company, means the date fixed for such redemption or
     repurchase pursuant to this Note.

     "SEC" means the Securities and Exchange Commission, or any successor
     agency.

     "Securities Act" means the Securities Act of 1933, as amended.

     "Senior Indebtedness" means the principal of, and interest on (including,
     without limitation, any interest that would accrue but for the filing of a
     petition initiating any proceeding referred to in Section 5.3 hereof) and
     other amounts due on or in connection with any Indebtedness of the Company
     (other than, with respect to each Note, any other Note) now or in the
     future owing to any Person, whether outstanding on the date of issue of
     this Note or thereafter created, incurred or assumed by the Company
     (including all deferrals, renewals, extensions or refundings of, or
     amendments, modifications or supplements to, Indebtedness of the kind
     described in this clause) unless, in the case of any particular

                                      -4-
<PAGE>
 
     Indebtedness, such Indebtedness provides by its terms that it shall not be
     senior in right of payment to the Notes.

     "Subsidiary" means (a) a corporation a majority of whose Capital Stock with
     voting power, under ordinary circumstances, to elect directors is at the
     time, directly or indirectly, owned by the Company, by a Subsidiary of the
     Company or by the Company and a Subsidiary of the Company or (b) any other
     Person (other than a corporation) in which the Company, a Subsidiary of the
     Company or the Company and a Subsidiary of the Company, directly or
     indirectly, at the date of determination thereof, has at least a majority
     ownership interest.

     "Tangible Net Worth" means, as of any date, the excess of (i) total assets
     of the relevant Person and its Subsidiaries determined on a consolidated
     basis in accordance with GAAP minus goodwill and any other items that are
                                   -----
     classified as "other intangibles" in accordance with GAAP, over (ii) the
     sum of (a) all liabilities of the such Person and its Subsidiaries
     determined on a consolidated basis in accordance with GAAP, plus (b) the
     amount, determined in accordance with GAAP, of any Redeemable Capital Stock
     which is issued and outstanding as of such date.

2.   Payment of Principal and Interest.
     --------------------------------- 

     2.1  Interest.  The Company shall pay the Holder interest on the principal
          --------                                                   
amount of this Note semiannually on May 1 and November 1 of each year,
commencing November 1, 1995, at the rate of 7% per annum. Interest will accrue
from the most recent date to which interest has been paid or, if no interest has
been paid, from the date of issue of this Note.

     2.2  Principal.  Except as otherwise provided in this Note, the Company
          ---------                                                 
shall pay the Holder the entire unpaid principal balance of this Note on the
Maturity Date.
 
     2.3  Method of Payments.  All payments and prepayments of principal and 
          ------------------      
interest on this Note shall be made in U.S. Dollars by wire transfer of
immediately available funds to such account as shall be specified by the Holder
by written notice to the Company.

     2.4  Default Interest.  If the Company shall fail to pay the Holder any 
          ----------------                                                   
amount owing under this Note when due, in addition to any other remedies the
Holder may have hereunder or under applicable law, the Company shall pay
interest on the amount in default from the due date to the date paid, at the
Default Rate.

     2.5  Pro Rata Allocation of Payments.  If there is more than one Holder of
          -------------------------------                                     
the Notes, the aggregate amount of any payment or prepayment of principal or
interest on all the Notes at any time shall be allocated among the Holders of
the Notes at the time

                                      -5-
<PAGE>
 
outstanding in proportion to the unpaid principal amounts of the Notes
respectively held by each such Holder.

     2.6  Payment Dates.  Notwithstanding any provision of this Note to the 
          -------------      
contrary, any payment or prepayment on account of principal or interest on this
Note which is due on a date which is not a Business Day shall be paid on the
next succeeding Business Day, and the amount of interest included in such
payment shall be computed to the date on which such payment is actually made.

3.   Prepayment.
     ---------- 

     3.1  Optional Redemption.
          ------------------- 
      
          (a)    The Company may redeem this Note at any time, at its option, in
     whole or in part, at 100% of the principal amount redeemed, plus accrued
     interest to the Redemption Date, subject to compliance with this Section
     3.1.

          (b)    At least 30 days but not more than 60 days before a Redemption
     Date, the Company shall mail a notice of redemption by first class mail to
     each Holder whose Notes are to be redeemed, in whole or in part. The Notice
     shall identify the Notes to be redeemed and shall state:

                 (i)    the Redemption Date;

                 (ii)   that Notes called for redemption must be surrendered to
          the Company for payment;

                 (iii)  that unless the Company defaults in making the
          redemption payment, interest on any Note called for redemption shall
          cease to accrue on and after the Redemption Date; and

                 (iv)   if any Note is being redeemed in part, the portion of
          the principal amount of such note to be redeemed and that, on or after
          the Redemption Date, and upon surrender of such Note, a new Note in
          principal amount equal to the unredeemed portion thereof will be
          issued.

          (c)    Once notice of redemption is mailed, Notes called for
     redemption become due and payable on the Redemption Date. Upon surrender to
     the company, the principal balance of such Notes called for redemption
     shall be paid by the Company on the Redemption Date, plus accrued and
     unpaid interest to the Redemption Date.

          (d)    Upon surrender of a Note that is to be redeemed in part, the
     Company shall issue to the Holder a new Note in principal amount equal to
     the unredeemed portion of the Note surrendered.

                                      -6-
<PAGE>
 
          (e)    Notes called for redemption pursuant to this Section 3.1 shall
     remain subject to the subordination provisions of section 5 hereof.

     3.2  Repurchase at the Option of Holder.
          ---------------------------------- 

          (a)    The Company covenants and agrees that, in the event of the
     occurrence of a Change in Control, each Holder will have the right, at such
     Holder's option, to require the Company to repurchase all, or any portion,
     of such Holder's Note on the Redemption Date selected as provided below,
     for an amount equal to the unpaid principal balance plus accrued and unpaid
     interest to the Redemption Date. Notes submitted for repurchase pursuant to
     this Section 3.2 shall remain subject to the subordination provisions of
     Section 5 hereof.

          (b)    Unless the Company shall have theretofore called for redemption
     all the outstanding Notes, on or before the 30th day after the occurrence
     of a Change in Control, the Company shall mail to each Holder a written
     notice (the "Company Notice") describing the occurrence of the Change in
     Control and the repurchase right set forth herein arising as a result
     thereof, as well as stating the final date by which the Notes must be
     surrendered for repurchase, the last day on which an election to require
     repurchase must be revoked, the conversion price then in effect, the
     Redemption Date, and the procedure which the Holder must follow to elect
     repurchase, including the place at which the Notes must be surrendered. No
     failure of the Company to give the foregoing notice or defect therein shall
     limit any Holder's right to exercise a repurchase right or affect the
     validity of the proceedings for the repurchase of Notes.

          (c)    To elect to require the repurchase of any Notes or portion
     thereof, the Holder will be required to surrender, on or before the Final
     Surrender Date (as defined below), at the Company's corporate headquarters
     as specified in the Company Notice , such Note to the Company, together
     with written notice in the form Provided by the Company of the holder's
     election to have the Company repurchase all or any portion of such Note
     specified in such notice. Election of repurchase by a Holder shall be
     revocable at any time prior to the Final Surrender Date by delivering
     written notice to that effect to the Company. For purposes of this Section
     3.2, "Final Surrender Date" shall mean the date which is, subject to any
     contrary requirements of applicable law, 60 days after the date of mailing
     to the Holders of the Company Notice and "Redemption Date" shall mean the
     date selected by the Company for the repurchase of the Notes, which date
     shall be not more than ten days after the Final Surrender Date.

          (d)    If a repurchase right shall be exercised in accordance with the
     terms hereof, the Company shall pay or cause to be paid to the Holder on
     the Redemption Date the unpaid principal balance plus accrued interest to
     the

                                      -7-
<PAGE>
 
     Redemption Date; provided, however, that any installment of interest that
                      --------  ------- 
     matures on or prior the Redemption Date shall be payable to the Holders of
     such Notes according to the terms and provisions of Section 2.

     3.3  Default.    If any Note surrendered for redemption or repurchase
          -------
     pursuant to Section 3.1 or 3.2 shall not be paid on the Redemption Date,
     the Note shall continue to bear interest from the Redemption Date at the
     Default Rate and each such Note shall remain convertible into Common Stock
     pursuant to Section 4 until the date on which the entire unpaid principal
     balance and accrued interest shall have been paid to the Holder.

4.   Conversion of Notes.
     -------------------

     4.1  Conversion. The Holder of this Note shall have the right, at his 
          ----------      
option, at any time up to and including April 25, 2005 (except that, with
respect to any Note or portion of a Note which shall be called for redemption
pursuant to Section 3.1 or repurchase pursuant to Section 3.2, such right shall
terminate, except as provided in Section 3.3, at the close of business on the
fifth Business Day prior to the Redemption Date fixed for such Note or portion
of a Note, to convert, subject to the terms and provisions of this Section 4,
all or any part (but not less than $1,000,000 or the unpaid principal balance of
this Note, whichever is less) the principal of any such Note into shares of
Common Stock of the Company, at the price of [125% of the average closing price
of Common Stock of the Company for March 17, 20, 21, 22, 23, 27, 28, 29, 30 and
31] per share; or, in case an adjustment of such price has taken place pursuant
to the provisions of Section 4.3, then at the price as last adjusted (such price
or adjusted price being referred to herein as the "conversion price"), upon
surrender of the Note, the principal of which is so to be converted, accompanied
by a conversion notice in the form provided (or separate written notice
reasonably satisfactory to the Company) (hereinafter referred to as the
"conversion notice") duly executed, to the Company at any time during usual
business hours and, if so required by the Company, accompanied by a written
instrument or instruments of transfer in form satisfactory to the Company duly
executed by the Holder or his attorney duly authorized in writing. For
convenience, the conversion of all or any portion of the principal of any Note
into the Common Stock is hereinafter sometimes referred to as the "conversion"
of such Note.

     4.2  Issuance of Common Stock.
          ------------------------

          (a)    As promptly as practicable after the surrender, as herein
     provided, of any Note for conversion, the Company shall deliver or cause to
     be delivered to or upon the written order of the Holder of the Note so
     surrendered, certificates representing the number of fully paid and
     nonassessable shares of Common Stock into which such Note may be converted
     in accordance with the provisions of this Section 4. Such conversion shall
     be deemed to have been made at the close of business on the date that such
     Note shall have been surrendered for

                                      -8-
<PAGE>
 
     conversion with the conversion notice duly executed, so that the rights of
     the Holder of a Note as such Holder shall cease (including with respect to
     accrued but unpaid interest) at such time and, subject to the following
     provisions of this paragraph, the Person or Persons entitled to receive the
     shares of Common Stock upon conversion of such Note shall be treated for
     all purposes as having become the record holder or holders of such shares
     of Common stock at such time, and such conversion shall be at the
     conversion price in effect at such time; provided, however, that no such
     surrender on any date when the stock transfer books of the Company shall be
     closed shall be effective to constitute the Person or Persons entitled to
     receive the shares of Common Stock upon such conversion as the record
     holder or holders of such shares of Common Stock on such date, but such
     surrender shall be effective to constitute the Person or Persons entitled
     to receive such shares of Common Stock as the record holder or holders
     thereof for all purposes at the close of business on the next succeeding
     day on which such stock transfer books are open; such conversion shall be
     at the conversion price in effect on the date that such Note shall have
     been surrendered for conversion, as if the stock transfer books of the
     Company had not been closed.

          (b)    Upon conversion of any Note which is converted in part only,
     the Company shall execute and deliver to or on the order of the Holder
     thereof, at the expense of the Company, a new Note in principal amount
     equal to the unconverted portion of such Note.

          (c)    If the last day for the exercise of the conversion right shall
     not be a Business Day, then such conversion right may be exercised on the
     next succeeding Business Day.

          (d)    Upon conversion of any Note as herein provided, the Common
     Stock issued upon such conversion shall be fully paid and nonassessable.

     4.3  Antidilution Provisions.    The conversion price shall be subject to
          ----------------------- 
adjustment from time to time as follows:

          (a)    If the Company shall (i) pay a dividend or make a distribution
     on the outstanding shares of its Common Stock in shares of its Common
     Stock, (ii) subdivide or reclassify the outstanding shares of its Common
     Stock into a greater number of shares, or (iii) combine or reclassify the
     outstanding shares of its Common Stock into a smaller number of shares, the
     conversion price in effect at the time of the record date for such dividend
     or distribution or the effective date of such subdivision, combination or
     reclassification shall be proportionately adjusted so that the Holder of
     any Note surrendered for conversion after such time shall be entitled to
     receive the number of shares of Common Stock which he would have owned or
     been entitled to receive had such Note been converted immediately prior to
     such time. Any shares of Common Stock issuable in

                                      -9-
<PAGE>
 
     payment of a dividend shall be deemed to have been issued immediately prior
     to the time of the record date for such dividend for purposes of
     calculating the number of outstanding shares of Common Stock under
     subsections (b) and (c) below. Such adjustment shall be made successively
     whenever any event specified above shall occur.

          (b)    If the Company shall fix a record date for the issuance of
     rights or warrants to all holders of its Common Stock entitling them to
     subscribe for or purchase shares of its Common Stock (or securities
     convertible into shares of its Common Stock) at a price per share (or
     having a conversion price per share) less than the Current Market Price (as
     defined in subsection (d) below) of a share of Common Stock on such record
     date, the conversion price shall be adjusted immediately thereafter so that
     it shall equal the price determined by multiplying the conversion price in
     effect immediately prior thereto by a fraction, of which the numerator
     shall be the number of shares of Common Stock outstanding on such record
     date plus the number of shares of Common Stock which the aggregate offering
     price of the total number of shares of such Common Stock so offered for
     subscription or purchase would purchase at the Current Market Price per
     share (determined by multiplying such total number of shares by the
     exercise price of such rights or warrants (or by the applicable conversion
     price in the case of convertible securities) and dividing the product so
     obtained by such Current Market Price), and of which the denominator shall
     be the number of shares of Common Stock outstanding on such record date
     plus the number of additional shares of Common Stock offered for
     subscription or purchase (or into which the convertible securities so
     offered are initially convertible). Shares of Common Stock owned by or held
     for the account of Company or its Subsidiaries shall not be deemed
     outstanding for the purpose of any such computation. Such adjustment shall
     be made successively whenever such a record date is fixed. In the event
     that such rights or warrants are not so issued, the conversion price then
     in effect shall be readjusted to the conversion price which would then be
     in effect if such record date had not been fixed.


          (c)    If the Company shall fix a record date for the making of a
     distribution to all holders of shares of its Common Stock (i) of shares of
     any class of its Capital Stock other than its Common Stock or (ii) of
     evidences of its indebtedness or (iii) of other assets (excluding non-
     extraordinary cash dividends or distributions, and dividends or
     distributions referred to in subsection (a) above) or (iv) of rights or
     warrants to subscribe for or purchase its securities (excluding those
     referred to in subsection (b) above), then in each such case the conversion
     price shall be adjusted immediately thereafter so that it shall equal the
     price determined by multiplying the conversion price in effect immediately
     prior thereto by a fraction, of which the numerator shall be the total
     number of shares of Common Stock outstanding multiplied by the Current
     Market Price per share on such record date, less the fair market value (as
     determined by the Board of Directors of the Company in good faith, and
     described in a resolution of

                                     -10-
<PAGE>
 
     the Board of Directors of the Company) of said shares or evidences of
     indebtedness or assets or rights or warrants so distributed, and of which
     the denominator shall be the total number of shares of Common Stock
     outstanding multiplied by such Current Market Price per share. Such
     adjustment shall be made successively whenever such a record date is fixed.
     In the event that such distribution is not so made, the conversion price
     then in effect shall be readjusted to the conversion price which would then
     be in effect if such record date had not been fixed.

          (d)    For the purpose of any computation under subsections (b) and
     (c) above, the "Current Market Price" per share on any date shall be deemed
     to be the average of the daily closing prices for the 10 consecutive
     trading days immediately preceding such date. The closing price for each
     day shall be the last reported sales price regular way or, in case no such
     reported sale takes place on such day, the average of the reported closing
     bid and asked prices regular way, in either case on the New York Stock
     Exchange, or, if the Common Stock is not listed or admitted to trading on
     such Exchange, on the principal national securities exchange or national
     automated quotation system on which the Common Stock is listed or admitted
     to trading or quoted or, if not so listed or admitted to trading or quoted,
     the average of the closing bid and asked prices in the over-the-counter
     market as furnished by any New York Stock Exchange firm selected from time
     to time by the Company for that purpose and reasonably satisfactory to the
     Holder. For purposes of this subsection (d), the term trading day shall not
     include any day on which securities are not traded on such exchange or in
     such market.

          (e)    In any case in which this Section 4 shall require that an
     adjustment shall become effective immediately after a record date or an
     effective date for an event, the Company may defer until the occurrence of
     such event (i) issuing to the holder of any Note converted after such
     record date or effective date and before the occurrence of such event the
     additional shares issuable upon such conversion by reason of the adjustment
     required by such event over and above the shares issuable upon such
     conversion before giving effect to such adjustment and (ii) paying to such
     holder any amount in cash in lieu of a fractional share pursuant to Section
     4.4, provided, however, that the Company shall deliver to such holder a due
     bill or other appropriate instrument evidencing such Holder's rights to
     receive such additional shares and such cash upon the occurrence of the
     event requiring such adjustment.

          (f)    No adjustment in the conversion price shall be required unless
     such adjustment would require an increase or decrease of at least 1% in
     such price; provided, however, that any adjustment which by reason of this
     subsection (f) is not required to be made shall be carried forward and
     taken into account in any subsequent adjustment.

                                     -11-
<PAGE>
 
          (g)    Whenever the conversion price is adjusted as provided in this
     Section 4.3, the Company shall promptly provide each Holder (i) an
     Officers' Certificate in the case of an adjustment pursuant to subsection
     (a) of this Section 4.3 or (ii) an Opinion of Counsel in the case of any
     other adjustment, in each case setting forth the conversion price after
     such adjustment and setting forth a brief statement of the facts requiring
     such adjustment and the computation thereof, which Officers' Certificate or
     Opinion of Counsel, as the case may be, shall be prima facie evidence of
     the correctness of any such adjustment absent manifest error.

          (h)    All calculations under this Section 4 shall be made to the 
     nearest cent or to the nearest one-hundredth of a share, as the case may
     be.

     4.4  Fractional Shares.  No fractional shares or script representing 
          -----------------
fractional shares shall be issued upon the conversion of any Note. If the
conversion of any Note results in a fraction, the Holder shall be paid an amount
equal to such fraction multiplied by the Current Market Price (determined as
provided in Section 4.3(d)).

     4.5  Mergers, Etc.
          ------------

          (a)    In case of any consolidation with or merger of the Company into
     another corporation (other than a merger or consolidation in which the
     Company is the continuing corporation), or in case of any sale, lease or
     conveyance to another Person of the property of the Company as an entirety
     or substantially as an entirety, such successor, leasing or purchasing
     corporation, as the case may be, shall execute a supplemental instrument
     providing that the Holder of each Note then outstanding shall have the
     right thereafter to convert such Note into the kind and amount of shares of
     stock, other securities or property, including cash, receivable upon such
     consolidation, merger, sale, lease or conveyance by a holder of the number
     of shares of Common Stock into which such Note might have been converted
     immediately prior to such consolidation, merger, sale, lease or conveyance.

          (b)    In case of (i) any reclassification or change of the shares of
     Common Stock of the Company issuable upon conversion of the Note or (ii)
     any consolidation with or merger of another corporation into the Company in
     which the Company is the continuing corporation and in which there is a
     reclassification or change of the shares of Common Stock issuable upon
     conversion of the Note (in each case, other than a change in par value, or
     from par value to no par value, or as a result of a subdivision or
     combination subject to Section 4.3(a), but including any change in the
     shares of Common Stock into two or more classes or series of shares), the
     Company shall execute a supplemental instrument providing that the Holder
     of each Note then outstanding shall have the right thereafter to convert
     such Note into the kind and amount of shares of stock, other securities or
     property, including cash, receivable upon 

                                     -12-
<PAGE>
 
     such reclassification, change, consolidation or merger by a holder of the
     number of shares of Common Stock into which such Note might have been
     converted immediately prior to such reclassification, change, consolidation
     or merger.

          (c)    Any supplemental instrument entered into pursuant to this
     Section 4.5 shall (i) where appropriate, state the conversion price in
     terms of one full share of Common Stock or one full share of the Capital
     Stock of any successor, leasing or purchasing corporation and (ii) provide
     for adjustments which shall be as nearly equivalent as may be practicable
     to the adjustments provided for in this Note. A copy of each such
     supplemental instrument shall be promptly provided to each Holder.

          (d)    The above provisions of this Section 4.5 shall similarly apply
     to successive reclassifications and changes of shares and to successive
     consolidations, mergers, sales or conveyances.

     4.6  Reservation of Shares.  The Company covenants that it will at all 
          ---------------------
times reserve and keep available, free from pre-emptive rights, out of its
authorized Common Stock, solely for the purpose of issue upon conversion of
Notes as herein provided, such number of shares of Common Stock as shall then be
issuable upon the conversion of all outstanding Notes. The Company covenants
that all shares of Common Stock which shall be so issuable shall be duly and
validly issued and fully paid and nonassessable. For purposes of this Section
4.6, the number of shares of Common Stock which shall be deliverable upon the
conversion of all outstanding Notes shall be computed as if at the time of
computation all outstanding Notes were held by a single Holder.

     4.7  Corporate Action.
          ----------------

          (a)    Before taking any action which would cause an adjustment
     reducing the conversion price below the then stated or par value of the
     shares of Common Stock issuable upon conversion of the Notes, the Company
     will take any corporate action which may, in the opinion of its counsel, be
     necessary in order that the Company may validly and legally issue fully
     paid and nonassessable shares of such Common Stock at such adjusted
     conversion price.

          (b)    The Company covenants that if any shares of Common Stock,
     required to be reserved for purposes of conversion of Notes hereunder,
     require registration with or approval of any governmental authority under
     any United States Federal or State Law, or listing upon the New York Stock
     Exchange or any other applicable national securities exchange or quotation
     system, before such shares may be issued upon conversion, the Company will
     in good faith and as expeditiously as possible endeavor to cause such
     shares to be duly registered, approved or listed, as the case may be.

                                     -13-
<PAGE>
 
     4.8  No Charge.  The issuance of certificates for shares of Common Stock
          ---------                                                          
upon the conversion of Notes shall be made without charge to the converting
Holders for any tax in respect of the issuance of such certificates, and such
certificates shall be issued in the respective names of, or in such names as may
be directed by, the Holders of the Notes converted; provided, however, that the
Company shall not be required to pay any securities transfer tax which may be
payable in respect of any transfer involved in the issuance and delivery of any
such certificate in a name other than that of the Holder of the Notes converted,
and the Company shall not be required to issue or deliver such certificates
unless or until the Person or Persons requesting the issuance thereof shall have
paid to the Company the amount of any such tax or shall have established to the
satisfaction of the Company that any such tax has been paid.

     4.9  Notice.  If at any time the Company shall propose:
          ------                                            

          (a)    to pay any dividend or make any distribution on shares of its
     Common Stock in shares of its Common Stock or to fix a record date for the
     making of any other distribution (other than a non-extraordinary cash
     dividend or distribution) to all holders of shares of its Common Stock; or

          (b)    to fix a record date for the issuance of rights or warrants to
     all holders of shares of its Common Stock entitling them to purchase any
     additional shares of its Common Stock or any other securities; or

          (c)    to effect any reclassification or change of outstanding shares
     of its Common Stock, or consolidation or merger, or sale, lease or
     conveyance of property, requiring the execution of a supplemental
     instrument pursuant to Section 4.5; or

          (d)    to effect any liquidation, dissolution or winding-up of the
     Company;

     then, and in any one or more of such cases, the Company shall cause notice
     thereof to be mailed to each Holder at such Holder's last address known to
     the Company at least 30 days prior to the date on which (i) the books of
     the Company shall close, or a record shall be taken, for such dividend,
     distribution or issuance of rights or warrants or (ii) such
     reclassification, change, consolidation, merger, sale, lease, conveyance,
     liquidation, dissolution or winding-up shall become effective, as the case
     may be.

     4.10  No Impairment.  The Company will not, by amendment of its Certificate
           -------------                                                        
of Incorporation or through any reorganization, transfer of assets,
consolidation, merger, dissolution, issue or sale of securities or any other
voluntary action, avoid or seek to avoid the observance or performance of the
terms to be observed or performed under this Section 4 by the Company, but will
at all times in good faith assist in carrying out all 

                                     -14-
<PAGE>
 
of the provisions of this Section 4 in order to protect the rights of the
Holders of the Notes against impairment of the conversion rights provided for
herein.

5.   Subordination.
     ------------- 

     5.1  Notes Subordinated to Senior Indebtedness.  The Company, for itself
          -----------------------------------------                          
and its successors, and each Holder of the Notes (whether upon original issuance
or upon transfer or exchange thereof), by his acceptance of the Notes, accepts
and agrees that the payment of the principal of and interest on the Notes is
subordinated and junior in right of payment, to the extent and in the manner
provided in this Section 5, to the prior payment in full of all Senior
Indebtedness.

     5.2  No Payment on Notes in Certain Circumstances.
          -------------------------------------------- 

          (a)    Upon the maturity of any Senior Indebtedness by lapse of time,
     acceleration or otherwise, all principal thereof and interest thereon and
     other amounts due in connection therewith shall first be paid in full, or
     such payment duly provided for in cash or in a manner satisfactory to the
     holders of such Senior Indebtedness, before any payment is made on account
     of principal of or interest on the Notes or to acquire any of the Notes for
     cash or property, other than Capital Stock of the Company, or on account of
     the redemption or repurchase provisions of the Notes.

          (b)    Upon the happening of an event of default (or if an event of
     default would result upon any payment with respect to the Notes) with
     respect to any Senior Indebtedness, as such event of default is defined
     therein or in any instrument under which it is outstanding, permitting the
     holders to accelerate the maturity thereof and, upon written notice thereof
     given to the Company and the Holders by the holders of such Senior
     Indebtedness ("Payment Notice"), then, unless and until such event of
     default shall have been cured or waived or shall have ceased to exist, no
     payment shall be made by the Company or any Subsidiary with respect to the
     principal of or interest on the Notes for cash or property (other than
     pursuant to conversion hereunder) or to acquire any of the Notes or on
     account of the redemption or repurchase and prepayment provisions of the
     Notes; provided, however, that this paragraph (b) shall not prevent the
     making of any payment for the longer of (x) 180 days after a Payment Notice
     shall have been given or (y) any period during which the Senior
     Indebtedness in respect of which such event of default exists has become
     due and payable in its entirety by reason of acceleration and such
     acceleration has not been rescinded or annulled and such Senior
     Indebtedness has not been paid in full. Notwithstanding the foregoing, not
     more than one Payment Notice may be given with respect to the same issue of
     Senior Indebtedness within a period of 360 consecutive days and no event of
     default in respect of any such Senior Indebtedness which existed or was
     continuing on the date of any Payment Notice shall be made the basis for
     the giving of a subsequent Payment Notice 

                                     -15-
<PAGE>
 
     unless all events of default in respect of any such Senior Indebtedness
     existing or continuing on the date of such first Payment Notice shall have
     been cured or waived for 180 consecutive days after such date.

          (c)    In furtherance of the provisions of Section 5.1, if,
     notwithstanding the foregoing provisions of this Section 5.2, any payment
     on or on account of the Notes shall be made by or on behalf of the Company
     and received by any Holder at a time when such payment was prohibited by
     the provisions of this Section 5.2, then unless and until such payment is
     no longer prohibited by this Section 5.2, such payment (subject to the
     provisions of Section 5.6 and 5.7) shall be held in trust for the benefit
     of and shall be immediately paid over to, the holders of Senior
     Indebtedness or the trustee or trustees under any indenture under which any
     instruments evidencing any of the Senior Indebtedness may have been issued,
     ratably according to the aggregate amount remaining unpaid on account of
     the principal of and interest on the Senior Indebtedness held or
     represented by each, for application to the payment of all Senior
     Indebtedness remaining unpaid. The Company shall give prompt written notice
     to each Holder of any event of default under any Senior Indebtedness or
     under any agreement pursuant to which Senior Indebtedness may have been
     issued which has not been cured or waived within any applicable grace
     period. Failure of the Company to give such notice shall not affect the
     subordination of the Notes to the Senior Indebtedness as provided in this
     Section 5.

     5.3  Notes Subordinated to Prior Payment of All Senior Indebtedness on
          ------------------------------------------------------------------
          Dissolution, Liquidation or Reorganization of Company.
          ----------------------------------------------------- 

          (a)    Upon any payment or distribution of assets of the Company as a
     result of any dissolution, winding up, liquidation or reorganization of the
     Company (whether in bankruptcy, insolvency or receivership proceedings or
     upon any assignment for the benefit of creditors or otherwise):

               (i)    the holders of all Senior Indebtedness shall first be
          entitled to receive payment in full, or to have such payment duly
          provided for in a manner satisfactory to them, of the principal and
          interest due thereon and other amounts due in connection therewith
          before the Holders shall be entitled to receive any payment on or on
          account of the Notes;

               (ii)   any payment or distribution of assets of the Company of
          any kind or character, whether in cash, property or securities, to
          which the Holders would be entitled except for the provisions of this
          Section 5 shall be paid by the Company or by any liquidating trustee
          or agent or other Person making such a payment or distribution,
          directly to the holders of Senior Indebtedness or to the trustee under
          any indenture under which Senior Indebtedness may have been issued,
          ratably to the extent necessary to make payment in full of all Senior
          Indebtedness remaining
                                     -16-
<PAGE>
 
          unpaid, after giving effect to any concurrent payment or distribution
          or provision thereof to the holders of such Senior Indebtedness; and

               (iii)  in the event that, notwithstanding the foregoing, any
          payment or distribution of assets of the Company of any kind or
          character, whether in cash, property or securities, shall be received
          by the Holders on or on account of the Notes before all Senior
          Indebtedness is paid in full, or effective provision made for its
          payment, such payment or distribution (subject to the provisions of
          Sections 5.6 and 5.7) shall be received and held in trust for and
          shall be paid over to the holders of the Senior Indebtedness remaining
          unpaid or unprovided for or to the trustee under any indenture under
          which Senior Indebtedness may have been issued, for application to the
          payment of such Senior Indebtedness ratably until all such Senior
          Indebtedness shall have been paid in full, after giving effect to any
          concurrent payment or distribution or provision thereof to the holders
          of such Senior Indebtedness.; provided, however, that no Holder shall
          be obligated to determine whether a payment or distribution received
          by it was appropriately made by the Company.

          (b)    The Company shall give prompt written notice to the Holders of
     any dissolution, winding up, liquidation or reorganization of the Company.
     Failure of the Company to give such notice shall not affect the
     subordination of the Notes to the Senior Indebtedness as provided in this
     Section 5.

     5.4  Holders to Be Subrogated to Rights of Holders of Senior Indebtedness.
          --------------------------------------------------------------------  
Subject to the payment in full of all Senior Indebtedness, the Holders of Notes
shall be subrogated to the rights of the holders of Senior Indebtedness to
receive payments or distributions of assets of the Company applicable to the
Senior Indebtedness until all amounts owing on the Notes shall be paid in full,
and for the purpose of such subrogation no such payments or distributions to the
holders of Senior Indebtedness by or on behalf of the Company or by or on behalf
of the Holders by virtue of this Section 5, which otherwise would have been made
to the Holders, shall, as between the Company and the Holders, be deemed to be
payment by the Company to or on account of the Senior Indebtedness, it being
understood that the provisions of this Section 5 are and are intended solely for
the purpose of defining the relative rights of the Holders, on the one hand, and
the holders of Senior Indebtedness, on the other hand.

          5.5  Obligations of the Company Unconditional; Reliance on Judicial 
               --------------------------------------------------------------
     Order.
     ----- 

          (a)    Nothing contained in this Section 5 or elsewhere in this Note
     is intended to or shall impair, as between the Company and the Holders, the
     obligation of the Company, which is absolute and unconditional, to pay to
     the Holders the principal of and interest on the Notes as and when the same
     shall become due and payable in accordance with their terms, or is intended
     to or

                                     -17-
<PAGE>
 
     shall affect (except to the extent specifically provided above in Section
     5.4) the relative rights of the Holders and creditors of the Company other
     than the holders of the Senior Indebtedness, nor shall anything herein
     prevent any Holder from exercising all remedies otherwise permitted by
     applicable law upon Default under this Note, subject to the rights, if any,
     under this Section 5 of the holders of Senior Indebtedness in respect of
     cash, property or securities of the Company received upon the exercise of
     any such remedy.

          (b)    Upon any payment or distribution of assets of the Company
     referred to in this Section 5, the Holders shall be entitled to rely upon
     any order or decree made by any court of competent jurisdiction in which
     any bankruptcy, dissolution, winding up, liquidation or reorganization
     proceedings are pending, or a certificate of a liquidating trustee or agent
     or of such court making any distribution to the Holders, for the purpose of
     ascertaining the Persons entitled to participate in such payment or
     distribution, the holders of the Senior Indebtedness and other Indebtedness
     of the Company, the amount thereof or payable thereon, the amount or
     amounts paid or distributed thereon and all other facts pertinent thereto
     or to this Section 5.

     5.6  Notice; Holders Entitled to Assume Payments Not Prohibited in Absence
          ---------------------------------------------------------------------
of Notice.  The Company shall give prompt written notice to the Holders of any
- ---------                                                                     
fact known to the Company which would prohibit the making of any payment to the
Holders in respect of the Notes pursuant to this Section 5.  No Holder shall at
any time be charged with knowledge of the existence of any facts which would
prohibit the making of any payment by the Company unless and until such Holder
shall have received written notice thereof from the Company or from one or more
holders of Senior Indebtedness or from any trustee therefor and, prior to the
receipt of any such written notice, the Holder shall be entitled to assume that
no such facts exist.

     5.7  Subordination Rights Not Impaired by Acts or Omissions of Company or
          --------------------------------------------------------------------
Holders of Senior Indebtedness.  No right of any present or future holders of
- ------------------------------                                               
any Senior Indebtedness to enforce subordination as provided herein shall at any
time or in any way be prejudiced or impaired by any act or failure to act on the
part of the Company or by any act or failure to act, in good faith, by any such
holder, or by any noncompliance by the Company with the terms of this Note,
regardless of any knowledge thereof which any such holder may have or be
otherwise charged with.  The holders of Senior Indebtedness may extend, renew,
modify or amend the terms of the Senior Indebtedness or any security therefor
and release, sell or exchange such security and otherwise deal freely with the
Company, all without affecting the liabilities and obligations the Holders of
the Notes.

     5.8  Events of Default.  The failure of the Company to make a payment on or
          -----------------                                                     
on account of the Notes by reason of any provision of this Section 5 shall not
be construed as preventing the occurrence of an Event of Default under Section
8.1.

                                     -18-
<PAGE>
 
     5.9  Reliance by Holders on Final Decree.  Notwithstanding anything in this
          -----------------------------------                                   
Section 5 to the contrary,

          (a)    no cash, property or securities paid or delivered to any Holder
     of this Note shall be required to be paid to the holders of Senior
     Indebtedness if such payment or delivery is authorized by a final non-
     appealable order or decree giving effect to the subordination of the
     indebtedness represented by this Note to Senior Indebtedness and made by a
     court of competent jurisdiction in a liquidation or dissolution of the
     Company or in a bankruptcy, reorganization, insolvency, receivership or
     similar proceedings under any applicable law, and

          (b)    no securities which are subordinate and junior, at least to the
     extent provided in this Section 5, to the payment of all Senior
     Indebtedness then outstanding and to the payment of any securities that are
     issued in exchange or substitution for such Senior Indebtedness and which
     are issued and delivered to the Holder of this Note pursuant to liquidation
     or dissolution of the Company or in a bankruptcy, reorganization,
     insolvency, receivership or similar proceedings, shall be paid or delivered
     to holders of Senior Indebtedness.


     5.10 Rights of Hughes under Stock Purchase Agreement.  Notwithstanding
          -----------------------------------------------                  
anything in this Section 5 to the contrary, so long as Hughes or any of its
Affiliates is the Holder of this Note, it shall have the right to apply this
Note, or any portion hereof, to discharge indemnity obligations of Hughes to the
Company under the Stock Purchase Agreement to the extent an Event of Default
shall have occurred and be continuing hereunder , as provided in Section
12.10(b) thereof; and any such discharge shall not be considered a payment on or
distribution of property of the Company in respect of this Note, for purposes of
this Section 5.

6.   Covenants
     ---------

     6.1  Limitation on Dividends and Other Distributions and Payments.  The
          ------------------------------------------------------------      
Company will not declare or pay any dividend on, or make any distribution to the
holders of any shares of Capital Stock of the Company, other than dividends or
distributions payable in its Capital Stock (other than Redeemable Capital
Stock), and neither the Company nor any Subsidiary will purchase, redeem or
otherwise acquire or retire for value any shares of Capital Stock of the Company
if at the time of such declaration, payment, distribution, purchase, redemption
or other acquisition or retirement a Default shall have occurred and be
continuing, or would exist immediately after giving effect to such transaction,
or if, at the time of such transaction, or after giving effect thereto, the
Tangible Net Worth of the Company is or would be less than Fifteen Million
Dollars ($15,000,000).

     6.2  Investment Company Act.  The Company will not register as, or conduct
          ----------------------                                               
its business or take any action which shall cause it to become or be deemed to
be, an 

                                     -19-
<PAGE>
 
"investment company" as defined under the Investment Company Act unless
exempted from all provisions of the Investment Company Act.  The Company will
deliver to each Holder within 30 days after the date thereof written notice of
any event which, but for the provisions of Rule 3a-2 (or any successor rule)
under the Investment Company Act, would have caused the Company to be deemed an
"investment company" as defined in the Investment Company Act.

     6.3  Liquidation.
          ----------- 

          (a)    Subject to the provisions of Section 7, the Company will not
     convey, transfer or lease, any substantial part of its assets unless, in
     the opinion of the Board of Directors of the Company, such conveyance,
     transfer or lease, considered together with all prior conveyances,
     transfers and leases of assets of the Company, would not materially and
     adversely affect the interest of the Holders of the Notes or the ability of
     the Company to meet its obligations under the Notes as they become due.

          (b)    The Company shall not adopt a plan of liquidation which
     provides for the distribution of all or substantially all of the assets of
     the Company, or the proceeds of any disposition of all or substantially all
     of the assets, to the holders of Capital Stock of the Company, unless the
     Company shall in connection with the adoption of such plan make provision
     for, or agree that prior to making any liquidating distributions it will
     make provision for, the satisfaction of the Company's obligations under the
     Notes as to the payment of principal and interest. Provision for such
     payments shall be deemed to have been made if there is an express
     assumption of the due and punctual payment of the Company's obligations
     under this Note and the performance and observance of all covenants and
     conditions to be performed by the Company hereunder, by the execution and
     delivery of a supplemental instrument in form satisfactory to the Holders
     by a Person which acquires or will acquire (otherwise than pursuant to a
     lease) a portion of the assets of the Company and which Person will have
     Tangible Net Worth (immediately after the effectiveness of the
     distribution) at least equal to the Tangible Net Worth of the Company
     (immediately preceding the effectiveness of the distribution) and which is
     organized and existing under the laws of the United States of America, any
     State thereof or the District of Columbia; provided, however that the
     Company may not make any liquidating distribution until after it shall have
     certified to the Holders with an Officers' Certificate at least fifteen
     days prior to the making of any liquidating distribution that it has
     complied with the provisions of this Section 6.3.

     6.4  Corporate Existence.  Except for any transaction in compliance with
          -------------------                                                
Section 6.3 or Section 7, the Company shall do or cause to be done all things
necessary to preserve and keep in full force and effect its corporate existence
and the corporate, partnership or other existence of each Material Subsidiary in
accordance with the respective organizational documents of each Material
Subsidiary and the rights 

                                     -20-
<PAGE>
 
(charter and statutory) and franchises of the Company and its Material
Subsidiaries; provided, however, that the Company shall not be required to
preserve, with respect to itself, any right or franchise, and with respect to
the Material Subsidiaries any such existence, right or franchise if the Board of
Directors of the Company, or the board of directors or managing partners of the
Material Subsidiary concerned, shall determine that the preservation thereof is
no longer desirable in the conduct of the business of the Company and the
Material Subsidiaries, taken as a whole.

     6.5  Compliance Certificate.  The Company shall deliver to each Holder
          ----------------------                                           
within 90 days after the end of each fiscal year of the Company an Officers'
Certificate stating whether or not the signers know of any Default by the
Company in performing its covenants in this Note.  If such signers do know of
such a Default, the certificate shall describe the Default.

     6.6  Waiver of Stay, Extension or Usury Laws.  The Company covenants that
          ---------------------------------------                             
it will not at any time insist upon, plead, or in any manner whatsoever claim or
take the benefit or advantage of, any stay or extension law or any usury law or
other law which would prohibit or forgive the Company from paying all or any
portion of the principal of and/or interest on the Notes as contemplated herein,
wherever enacted, now or at any time hereafter in force, or which may affect the
covenants or the performance of this Note; and (to the extent that it may
lawfully do so) the Company hereby expressly waives all benefit or advantage of
any such law, and covenants that it will not hinder, delay or impede the
execution of any power herein granted to the Holders but will suffer and permit
the execution of every such power as though no such law had been enacted.

     6.7  SEC or other Reports.
          -------------------- 

          (a)    So long as the Notes remain outstanding, the Company shall
     deliver to each Holder, promptly after filing with the SEC, copies of the
     quarterly and annual reports and of the proxy or information statements and
     other periodic or current reports (or copies of such portions of any of the
     foregoing as the SEC may by rules and regulations prescribe) which the
     Company is required to file with the SEC pursuant to Section 13 or 15(d) of
     the Exchange Act.

          (b)    So long as the Notes remain outstanding, the Company shall
     cause its annual reports to stockholders to be mailed to the Holders at
     their addresses appearing in the Note Register maintained by the Company.

     6.8  Notice of Defaults.  If any Indebtedness of the Company or any of its
          ------------------                                                   
Material Subsidiaries is declared due and payable before its maturity because of
the occurrence of any event of default (or any event which, with notice or the
lapse of time, or both, shall constitute such event of default) under such
Indebtedness, the Company will promptly give written notice to the Holders of
such declaration, unless such declaration shall have been withdrawn.

                                     -21-
<PAGE>
 
7.   Successor Corporation
     ---------------------

     7.1  When Company May Merge, Etc.  The Company shall not consolidate with
          ----------------------------                                        
or merge with or into any other corporation or other Person or transfer or lease
in a single transaction or through a series of transactions all or substantially
all of its properties and assets as an entirety or substantially as an entirety
to any Person or group of affiliated Persons, unless:

          (a)    either the Company shall be the continuing Person, or the
     Person (if other than the Company) formed by such consolidation or into
     which the Company is merged or to which the properties and assets of the
     Company as an entirety are transferred shall be a corporation organized and
     existing under the laws of the United States or any State thereof or the
     District of Columbia and shall expressly assume, by an assumption
     instrument supplemental hereto, executed and delivered to the Holder, in
     form satisfactory to the Holder, all the obligations of the Company under
     this Note;

          (b)    the Person formed by such consolidation or surviving such
     merger or to which the properties and assets of the Company as an entirety
     or substantially as an entirety are transferred shall have Tangible Net
     Worth (immediately after giving effect to such transaction), equal to or
     greater than the lesser of (i) the Tangible Net Worth of the Company
     (immediately preceding such transaction) or (ii) Fifteen Million Dollars
     ($15,000,000).

          (c)    immediately before and immediately after giving effect to such
     transaction, no Event of Default shall have occurred and be continuing; and

          (d)    the Company shall have delivered to the Holder an Officers'
     Certificate and an Opinion of Counsel, each stating that such
     consolidation, merger or transfer and such assumption instrument comply
     with this Section 7.1 and that all conditions precedent herein provided
     relating to such transaction have been complied with.

     7.2  Successor Corporation Substituted.  Upon any consolidation or merger,
          ---------------------------------                                    
or any transfer of all or substantially all of the assets of the Company in
accordance with Section 7.1, the successor Person formed by such consolidation
or into which the Company is merged or to which such transfer is made shall
succeed to, and be substituted for, and may exercise every right and power of,
the Company under this Note with the same effect as if such successor Person had
been named as the Company herein.

8.   Default and Remedies
     --------------------

     8.1  Events of Default.  An "Event of Default" shall occur under this Note
          -----------------                                                    
if:

                                     -22-
<PAGE>
 
          (a)    the Company defaults in the payment of interest on any Notes
     when the same becomes due and payable and the default continues for a
     period of five days;

          (b)    the Company defaults in the payment of the principal of this
     Note when the same becomes due and payable (or, if such failure to pay is
     due solely to a failure of the wire transfer payments system and is not
     attributable to a failure of the Company to timely initiate (or attempt to
     initiate) payment, within one Business Day of the due date thereof), at
     maturity, upon redemption (including any redemption or repurchase
     contemplated by Section 3.1 or 3.2 hereof) or otherwise;

          (c)    the Company fails to comply with any of its other agreements
     contained in the Notes and the failure continues without cure for the
     period of sixty (60) days after notice from the Holder to the Company
     specifying the failure in reasonable detail; provided, however, that the
     failure to comply with any of the agreements in Sections 6.1, 6.2, 6.3 or 7
     shall constitute an Event of Default without notice or right to cure;

          (d)    there shall be a default under any Indebtedness or under any
     mortgage, indenture or other instrument under which there may be issued or
     by which there may be secured or evidenced any Indebtedness of the Company
     or any Subsidiary, whether such Indebtedness now exists or shall hereafter
     be created, which default extends beyond any period of grace provided with
     respect thereto and which default relates to (i) the obligation to pay the
     principal of or interest on any such indebtedness or (ii) an obligation
     other than the obligation to pay the principal of or interest on any such
     Indebtedness, and the effect of such default is to cause such Indebtedness
     to become due and payable prior to its stated maturity (unless such default
     has been cured or waived, or any acceleration with respect thereto has been
     rescinded, within 15 days after such acceleration); provided, however, that
     no default under this clause (d) shall exist if all such outstanding
     defaults at any particular time do not relate to such Indebtedness with an
     aggregate principal amount of at least $5,000,000;

          (e)    the Company or any Material Subsidiary, pursuant to or within
     the meaning of any Bankruptcy Law (i) becomes insolvent, (ii) fails
     generally to pay its debt as they become due, (iii) admits in writing its
     inability to pay its debts generally as they become due, (iv) commences a
     voluntary case or proceeding, (v) consents to the entry of a judgment,
     decree or order for relief against it in an involuntary case or proceeding,
     vi) consents to or acquiesces in the institution of bankruptcy or
     insolvency against it, (vii) applies for, consents to or acquiesces in the
     appointment of or taking possession by a Custodian of it or for any
     substantial part of its property, or (viii) makes a general assignment for
     the benefit of its creditors;

                                     -23-
<PAGE>
 
          (f)    a court of competent jurisdiction enters a judgment, decree or
     order for relief in respect of the Company or any Material Subsidiary in an
     involuntary case or proceeding under any Bankruptcy Law which shall (i)
     approve as properly filed a petition seeking reorganization, arrangement,
     adjustment or composition in respect of the Company or any Material
     Subsidiary, (ii) appoint a Custodian of the Company or any Material
     Subsidiary or for any substantial part of its property or (iii) order the
     winding-up or liquidation of the affairs of the Company or any Material
     Subsidiary; and such judgment, decree or order shall remain unstayed and in
     effect for a period of 60 consecutive days; or any bankruptcy or insolvency
     petition or application is filed, or any bankruptcy or insolvency
     proceeding is commenced, against the Company or any Material Subsidiary and
     such petition, application or proceeding is not dismissed within 60 days;
     or any warrant of attachment is issued against any substantial part of the
     property of the Company or any Material Subsidiary which is not released
     within 60 days of service; or

          (g)    final judgments (not covered by insurance) for the payment of
     money which in the aggregate at any time exceed $5,000,000 shall be
     rendered against the Company or any Material Subsidiary by a court of
     competent jurisdiction and shall remain undischarged for a period (during
     which execution shall not be effectively stayed) of 60 days after such
     judgment becomes final and nonappealable.

     8.2  Acceleration.  If an Event of Default (other than an Event of Default
          ------------                                                         
specified in Section 8.1(e) or (f)) occurs and is continuing, the Holder may, by
notice to the Company, declare the entire principal balance and accrued interest
to the date of acceleration on this Note then outstanding (if not then due and
payable) to be due and payable and, upon any such declaration, the same shall
become and be immediately due and payable.  If an Event of Default specified in
Section 8.1(e) or (f) occurs, the entire principal balance of this Note and
accrued interest on this Note then outstanding shall become and be immediately
due and payable without any declaration or other act of the part of the Holder.
A delay or omission by the Holder in exercising any right or remedy accruing
upon a Event of Default shall not impair the right or remedy or constitute a
waiver of or acquiescence in the Event of Default.  No remedy is exclusive of
any other remedy.  All available remedies are cumulative to the extent permitted
by law.

     8.3  Other Remedies.  If an Event of Default occurs and is continuing, the
          --------------                                                       
Holder may pursue any available remedy by proceeding at law or in equity to
collect the payment of principal of or interest on this Note (subject to Section
8.2) or to enforce the performance of any provision of this Note.

                                     -24-
<PAGE>
 
     8.4  Collection Costs.  The Company shall pay on demand all costs and
          ----------------                                                
expenses, including reasonable attorneys' fees and costs, if any, incurred by
the Holder in connection with the enforcement of this Note.

9.   Issuance, Registration, Transfer and Replacement of Notes.
     --------------------------------------------------------- 

     9.1  Issuance of Notes.  This Note, and any Note or Notes issued upon
          -----------------                                               
transfer or exchange hereof, are issuable only in fully registered form, without
coupons, in minimum denominations of $1,000,000 (or such lesser amount as shall
remain outstanding after any partial prepayment, partial conversion or other
discharge of a portion of this Note).

     9.2  Note Register.  The Company shall maintain at its corporate
          -------------                                              
headquarters a register in which it shall register the names, addresses (and, if
different, addresses for delivery of notices and payments of principal and
interest, including the location and account numbers of any bank accounts
designated by the registered Holders to receive payments by wire transfer) and
taxpayer identification numbers of the registered Holders of the Notes and
details with respect to the issuance, transfer and exchange of Notes (the "Note
Register").

     9.3  Restriction on Transfer.
          ----------------------- 

          (a)    This Note has not been registered under the Securities Act or
     any state securities or Blue Sky laws and neither this Note nor any
     interest or participation herein may be sold, transferred, assigned or
     otherwise disposed of or hypothecated in the absence of such registration
     or an exemption therefrom under the Securities Act and such laws and the
     respective rules and regulations thereunder.

          (b)    This Note may not be transferred, assigned or otherwise
     disposed of or hypothecated in aggregate principal amounts less than
     $1,000,000; provided that if due to any partial prepayment, partial
                 --------
     conversion or other discharge of a portion of this Note, the aggregate
     principal amount of this Note shall be less than $1,000,000, this Note may
     be transferred, assigned or otherwise disposed of or hypothecated in its
     entirety.

     9.4  Transfer.  All Notes presented for registration of transfer or
          --------                                                      
exchange shall be duly endorsed or be accompanied by appropriate written
instruments of transfer, and thereupon the Company will issue in the name of the
transferee or transferees, in exchange therefor, a new Note or Notes having
identical terms and provisions and in a like aggregate principal amount in
authorized denominations;  provided, however, that the Company shall not be
                           --------  -------                               
required to register the transfer of any Note (or any part of a Note) which has
been called for redemption or repurchase pursuant to Sections 3.1 or 3.2 during
the period of 15 days before the mailing of notice of such redemption or
repurchase to the Holders and ending at the close of business 

                                     -25-
<PAGE>
 
on the day of such mailing. In addition, in connection with any such proposed
registration of transfer or exchange, the Company shall be entitled, if it shall
reasonably request, to receive an Opinion of Counsel, satisfactory to the
Company, from the Holder requesting such registration to the effect that any
sale, transfer or other disposition giving rise to such request has been
conducted in compliance with, or pursuant to an exemption from, the Securities
Act.

     9.5  Removal of Legend.  Notes no longer subject to the restrictions on
          -----------------                                                 
resale or transfers arising under the Securities  Act with respect to privately
placed securities (whether by virtue of Rule 144 under the Securities Act or
otherwise) may be surrendered to the Company for exchange for new Notes not
bearing a restrictive legend relating to matters under the Securities Act.  The
Company shall be entitled, if it shall reasonably request, to receive an Opinion
of Counsel, satisfactory to the Company, from the registered Holder of any Note
so surrendered to the effect that the restrictions on resale and transfer of
such Note are no longer required under the Securities Act.

     9.6  Charges.  No service charge shall be imposed upon a Holder of a Note
          -------                                                             
in connection with any transfer or exchange of such Note, but the Company may
require payment of a sum sufficient to cover any tax or governmental charge
arising in connection therewith.

     9.7  Persons Deemed Owners.  Prior to due presentment of a Note for
          ---------------------                                         
registration of transfer, the Company may treat the registered Holder of such
Note as the owner of such Note for all purposes, whether or not such Note shall
be overdue, and the Company shall not be affected by any notice to the contrary.

     9.8. Mutilated, Lost, Stolen or Destroyed Notes.  In case any Note shall
          ------------------------------------------                         
become mutilated or destroyed, lost or stolen, and upon the satisfaction by the
registered Holder thereof of the requirements of this Section 9.8 for a
substituted Note, the Company shall execute and deliver a new Note having
identical terms and provisions and in like principal amount, in exchange and
substitution for the mutilated Note or in lieu of and substitution for the Note
destroyed, lost or stolen.  In the case of loss, theft or destruction, the
registered Holder shall furnish to the Company such indemnity as may be required
to save it harmless and shall also furnish to the Company evidence to its
satisfaction of the destruction, loss or theft of such Note and of the ownership
thereof.  In the case of mutilation, the registered Holder shall surrender such
mutilated Note to the Company for cancellation thereof.  Upon the issuance of
any substituted Note, the Company may require the payment of a sum sufficient to
cover any tax or other governmental charge that may be imposed in relation
thereto and any other expenses connected therewith.  In case any Note which has
matured or is about to mature or has been called for redemption or surrendered
by the Holder for repayment shall become mutilated or be destroyed, lost or
stolen, the Company may, instead of issuing a substituted Note, pay or authorize
the payment of the same (without surrender thereof except in the case of a
mutilated Note).

                                     -26-
<PAGE>
 
     9.9  Book Entry.  In the event that The Depository Trust Company or any
          ----------                                                        
similar depository provides for book-entry settlement and clearance for
privately placed securities, the Company may elect, at its option, upon not less
than 30 days prior written notice sent by first-class mail to the registered
Holder of this Note at its address for notices as it appears in the Note
Register, to permit or to cause such Holder to exchange this Note or a Note in
book-entry form.  The manner of such exchange and any related terms of such
book-entry Note will be described in such notice.

     9.10 Information.  The Company agrees (a) to make available upon request
          -----------                                                        
such information required by Rule 144A (d)(4) as may be required to enable
resales of this Note to be made pursuant to Rule 144A  and (b) when requested by
a registered Holder, will use its reasonable best efforts to facilitate any
proposed resales of Notes to "qualified institutional buyers" pursuant to Rule
144A.  Further, the restrictions upon resales and other transfers of this Note,
as set forth in Sections 9.3 and 9.5 of this Note, may be modified from time to
time, with notice to the registered Holder hereof, to reflect any amendment to
Rule 144A or change in the interpretation thereof or practices thereunder.

10.  Miscellaneous.
     ------------- 

     10.1 Interpretation.  The headings in this Note are included for ease of
          --------------                                                     
reference only and shall not control or affect the meaning or construction of
any of the provisions of this Note.  Words used herein, regardless of the gender
and number specifically used, shall be deemed and construed to include any other
gender, masculine, feminine or neuter, and any other number, singular or plural,
as the context requires.

     10.2 Notices.  All notices to the Company under this Note shall be in
          -------                                                         
writing and addressed to the Company at Whittaker Corporation, 10880 Wilshire
Boulevard, Los Angeles, California 90024, Attention:  Chief Financial Officer,
or to such other address as the Company may specify by notice to the registered
Holders of Notes by notice sent by first-class mail to their addresses for
notices as they appear in the Note Register.

     10.3 Binding Effect.  Any action by the registered Holder of this Note
          --------------                                                   
shall bind all future Holders of this Note, and of any Note issued in exchange
or substitution herefor or in place hereof, in respect of anything done or
permitted by the Company in pursuance of such action.

     10.4 Applicable Law.  This Note shall be governed by and construed in
          --------------                                                  
accordance with the laws of the State of California applicable to agreements
made and to be wholly performed in such State.

                                     -27-
<PAGE>
 
     10.5 No Recourse Against Others.  No director, officer, employee,
          --------------------------                                  
stockholder or incorporator, as such, of the Company, shall have any liability
for any obligations of the Company under this Note or for any claim based on, in
respect of, or by reason of such obligations or their creation.  Each Holder by
accepting this Note waives and releases all such liability.  Such waiver and
release are part of the consideration for the issuance of this Note.

     10.6 No Adverse Interpretation of Other Agreements.  This Note may not be
          ---------------------------------------------                       
used to interpret another note or other evidence of Indebtedness or any
indenture, loan or debt agreement of the Company or any of its Subsidiaries.
Any such other note or evidence of Indebtedness, or any such indenture, loan or
debt agreement, may not be used to interpret this Note.

     IN WITNESS WHEREOF, the Company has caused this Note to be duly executed by
its officers thereunto duly authorized and its corporate seal or a facsimile
thereof to be imprinted hereon.

                                   WHITTAKER CORPORATION

                                   By: _______________________________
                                             [Title]

[SEAL]


Attest: _______________________________
              [Title]

Dated:

                                     -28-
<PAGE>
 
                               CONVERSION NOTICE

TO WHITTAKER CORPORATION

     The undersigned registered Holder of this Note hereby irrevocably exercises
the option to convert this Note, or portion hereof (lesser of $1,000,000
principal amount or face amount of Note) below designated, into shares of Common
Stock of WHITTAKER CORPORATION in accordance with the terms of this Note, and
directs that the shares issuable and deliverable upon the conversion, together
with any check in payment for fractional shares and any Note representing any
unconverted principal amount hereof, be issued and delivered to the registered
Holder hereof unless a different name has been indicated below.  If shares are
to be issued in the name of a person other than the undersigned, the undersigned
will pay all transfer taxes payable with respect thereto.

                                          Dated:

If different from that of 
registered Holder, print name and 
address (including zip code) of 
person in whose name the Common           ______________________________________
Stock will be issued:                             Signature of Holder(s)


________________________________           Social Security      Principal Amount
            (Name)                        or other taxpayer     to be Converted:
                                          identifying number      $
________________________________                  Signature(s) Guaranteed
           (Address)

________________________________

                                  ASSIGNMENT

TO WHITTAKER CORPORATION

     FOR VALUE RECEIVED the undersigned registered Holder hereby sells, assigns
and transfers unto
PLEASE INSERT SOCIAL SECURITY OR OTHER
  IDENTIFYING NUMBER OF ASSIGNEE
________________________________________________________________________________
  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OR ASSIGNEE)

________________________________________________________________________________
the within Note, and all rights thereunder, hereby irrevocably constituting and
appointing

____________________________________________________________________  Attorney
to transfer said Note on the Note Register of the Company, with full power of
substitution in the premises


Dated:
                                              __________________________________
<PAGE>
 
                                                               Exhibit 1.3(c)
                                                               --------------
                    CONTINGENT PAYMENTS BY WHITTAKER
                    --------------------------------
 
1.   Definitions. For purposes of this Exhibit 1.3(c), capitalized terms not
     -----------
otherwise defined herein shall have the meanings given them in the Stock
Purchase Agreement to which this is attached as an Exhibit, and the following
terms shall have the following meanings:

     (a)   "Change in Control" of Whittaker means any of the following:

           (i) a Person or "group" (within the meaning of Sections 13(d) and
           14(d)(2) of the Exchange Act) becoming the "beneficial owner" (as
           defined in Rule 13(d)(3) of the Exchange Act) of the Voting Shares
           entitled to exercise more than 50% of the total voting power of all
           outstanding Voting Shares, unless such beneficial ownership is
           approved by the Board of Directors of Whittaker prior to such
           acquisition; or

           (ii) a change in the Board of Directors of Whittaker in which the
           individuals who constituted the Board of Directors of Whittaker at
           the Closing Date (together with any other director whose election by
           the Board of Directors of Whittaker or whose nomination for election
           by the stockholders of Whittaker is approved by a majority of the
           individuals who constituted the Board of Directors of Whittaker at
           the Closing Date) cease for any reason to constitute a majority of
           the Board of Directors of Whittaker; or

           (iii) any share exchange of Whittaker with, or merger of Whittaker
           with or into, any other Person, or any sale or transfer of all or
           substantially all of the assets of Whittaker to another Person, other
           than (A) a merger which is effected solely to change the jurisdiction
           of incorporation of Whittaker, or (B) any share exchange with, or
           merger with or into, another Person for the purpose of acquisition by
           Whittaker of such other Person, or (C) any merger of the Company with
           or into a wholly-owned subsidiary of the Company; or

           (iv) any other transaction which constitutes a "business
           combination", as defined in Section 203(c)(3) of the Delaware General
           Corporation Law.

     (b)   "Enterprise Hub Products" means any electronic system to support
     structured wiring of local area networks and to support internetworking
     between one local area network and one or more other local or wide area
     networks, including, without limitation, the Enterprise Hub product and its
<PAGE>
 
     interface cards currently offered, or offered in the future, by the Company
     (or any successor to the Company), and enhancements of any of the
     foregoing.


     (c)   "Fiscal Year" means each 12 month period from November 1 through and
     including the immediately succeeding October 31.

     (d)   "Measurement Period" means each six month period from November 1
     through and including the immediately succeeding April 30, and from May 1
     through and including the immediately succeeding October 31, during the
     period of four Fiscal Years of Whittaker and its consolidated subsidiaries,
     commencing on November 1, 1995 and ending on October 31, 1999.

     (e)   "Sales" means gross sales of Enterprise Hub Products by Whittaker or
     its "affiliates" (as defined in Rule 12b-2 of the Exchange Act), or by any
     licensees of Intellectual Property associated with Enterprise Hub Products,
     to any Person (including gross sales of Enterprise Hub Products to
     Whittaker and its Affiliates for use, not resale, by such Persons), less
     the total of (i) ordinary and customary trade, cash and quantity discounts
     and (ii) sales or use taxes, excise taxes and customs duties.

     (f)   "Trigger Event" means any of the following:

           (i)    any acquisition of "control" (as defined in Rule 12b-2 of the
           Exchange Act) of the Company (including any successor to the Company)
           by any Person other than Whittaker or a controlled subsidiary of
           Whittaker; or

           (ii)   any sale or other disposition of Assets or Intellectual
           Property of the Company (including any successor to the Company)
           required for the sale of Enterprise Hub Products, other than (A) any
           sale or other disposition of Assets (but not Intellectual Property)
           in the ordinary course of business of the Company, (B) any sale or
           other disposition of Assets or Intellectual Property to Whittaker or
           a controlled subsidiary of Whittaker, or (C) any license of
           Intellectual Property if the gross sales by the licensee are included
           as Sales under this Exhibit 1.3(c); or

           (iii)  any discontinuance of the sale of Enterprise Hub Products by
           the Company and its affiliates.

     (g)   "Voting Shares" means the Common Stock and any other shares of 
     capital stock of Whittaker which have the right to vote on the election of
     any members of the Board of Directors of Whittaker.

                                      -2-
<PAGE>
 
2.   Contingent Payment Obligation.

2.1  Contingent Payments.  Within 45 days after the end of each Measurement
     -------------------
Period, Whittaker shall pay to Hughes an amount ("Contingent Payment")
determined as provided below:

     (a) If and to the extent that total Sales during the Fiscal Year in which
     such Measurement Period occurs are Fifty Million Dollars ($50,000,000) or
     less, the Contingent Payment shall be equal to seven percent (7%) of total
     Sales for such Measurement Period.

     (b) If and to the extent that total Sales during the Fiscal Year in which
     such Measurement Period occurs are greater than Fifty Million Dollars
     ($50,000,000), the Contingent Payment shall be equal to seven percent (7%)
     on that portion of total Sales for the entire Fiscal Year which are equal
     to or less than $50,000,000 and shall be equal to the percentage specified
     below of total Sales in excess of $50,000,000 for such Fiscal Year, in each
     case with the Contingent Payment to be made by Whittaker following each
     Measurement Period to be based on total Sales for such Measurement Period:

         FISCAL YEAR ENDING                        APPLICABLE PERCENTAGE
         ------------------                        --------------------- 
          October 31, 1996                           Four percent (4%)
          October 31, 1997                          Three percent (3%)
          October 31, 1998                           Two percent (2%) 
          October 31, 1999                           One percent (1%)

     (c)    The aggregate amount of all Contingent Payments made by Whittaker as
     provided herein shall not exceed Twenty Five Million Dollars ($25,000,000)
     (the "Maximum Aggregate Contingent Payment").

2.2  Mandatory Payment.  If, at any time prior to the expiration of the
     -----------------
Measurement Period, either a Change in Control of Whittaker or a Trigger Event
shall occur, then, immediately upon demand by Hughes and at the sole option of
Hughes, Whittaker shall pay to Hughes an amount equal to the positive
difference, if any, obtained by subtracting (a) the aggregate amount of all
Contingent Payments made by Whittaker to Hughes through the date of such demand
by Hughes, from (b) Seventeen Million Five Hundred Thousand Dollars
($17,500,000).  Whittaker shall notify Hughes of the occurrence of any Change in
Control of Whittaker or any Trigger Event no later than ten days after any such
occurrence.

2.3  Default Interest.  If Whittaker shall fail to pay Hughes any amount owing
     ----------------
under this Exhibit 1.3(c) when due (including any payment which is deferred
           -------------
under Section 2.6 hereof), in addition to any other remedies Hughes may have
hereunder 

                                      -3-
<PAGE>
 
or under applicable law, Whittaker shall pay interest on the amount in default
from the due date to the date paid, at the Default Rate.

2.4  Payments.  Whittaker shall pay all amounts owing to Hughes under this
     --------
Exhibit 1.3(c) by wire transfer of immediately available funds to such account
- --------------
as shall be specified by Hughes from time to time by notice to Whittaker,
without setoff, counterclaim or other deduction.

2.5  Treatment of Payments.  Except as otherwise required by law, all payments
     ---------------------
made by Whittaker to Hughes under this Exhibit 1.3(c) shall be treated as
                                       -------------- 
consideration for the Stock for tax purposes and such agreed treatment shall
govern for purposes of the Agreement.

2.6  Suspension of Contingent Payments.  Notwithstanding anything in this
     ---------------------------------
Exhibit 1.3(c) to the contrary, Hughes acknowledges that it is aware that the
Whittaker Credit Agreement provides that Whittaker shall not make Contingent
Payments hereunder if, and during such period as, the fixed charge coverage
ratio of Whittaker and its consolidated subsidiaries (determined as provided in
such Whittaker Credit Agreement) is less than 1.5 to 1 ("Fixed Charge
Deficiency").  Hughes agrees that, for a period of 180 days after receipt of
written notice from Whittaker or the agent for the banks under the Whittaker
Credit Agreement to the effect that a Fixed Charge Deficiency has occurred and
is continuing (or until such Fixed Charge Deficiency is cured or waived within
such 180-day period), Hughes shall not enforce the payment obligations of
Whittaker under this Exhibit 1.3(c).  If, at or prior to the expiration of the
180-day period referred to in the preceding sentence, the obligations of
Whittaker under the Whittaker Credit Agreement shall have been accelerated by
the banks, Hughes shall not enforce the payment obligations of Whittaker under
this Exhibit 1.3(c) until all obligations of Whittaker under the Whittaker
Credit Agreement shall have been paid in full or until the banks shall have
waived the defaults and expressly agreed to permit payments to Hughes hereunder.
If, however, the preceding sentence shall not be applicable then Hughes may, at
the expiration of the 180-day period referred to therein, enforce the payment
obligations of Whittaker under this Exhibit 1.3(c).

3.   Reports and Audit Rights of Hughes.
     ---------------------------------- 

3.1  Reports and Audit Rights.  Each payment by Whittaker pursuant to this
     ------------------------
Exhibit 1.3(c) shall be accompanied by a report from Whittaker showing, in
- --------------
reasonable detail, the Sales for the applicable Measurement Period and Fiscal
Year and the computation of the Contingent Payment.  Whittaker shall keep full
and accurate books and records setting forth the gross sales of Enterprise Hub
Products and all adjustments thereto as provided in the definition of "Sales."
Whittaker shall permit Hughes, or an independent auditor selected by Hughes, to
examine the books and record of Whittaker, the Company or any affiliate which
are relevant to the obligations of Whittaker under this Exhibit 1.3(c), at any
                                                        --------------
time but not more 

                                      -4-
<PAGE>
 
frequently than annually and not later than one year following expiration of
each Fiscal Year.

3.2  Payment Adjustments.  If, as a result of any audit as provided in Section
     -------------------
3.1, Hughes determines that Whittaker has not paid Hughes the amounts owing
under this Exhibit 1.3(c) Hughes shall give Whittaker notice of the amount owed
           --------------
and unless Whittaker disputes such determination, or at such time as the dispute
is resolved in favor of Hughes, Whittaker shall immediately pay to Hughes the
actual amount owed plus interest at the Default Rate.  The costs of the audit
shall be paid pro rata by Hughes and Whittaker, according to the actual amount
owed as compared with the amount claimed by Hughes.

4.   Commitments of Whittaker.
     ------------------------
4.1  Best Efforts.  Whittaker shall use its reasonable best efforts to maximize
     ------------
the Sales of Enterprise Hub Products during the Measurement Period.  Without
limiting the generality of the foregoing, Whittaker shall endeavor in good faith
to cause the Company to implement the enhancement plans proposed by Whittaker
for the Company as described in the letter delivered by Whittaker to Hughes,
subject to commercial considerations applicable to Whittaker and the Company.

4.2  No Impairment.  Whittaker will not, through any voluntary action, avoid or
     -------------
seek to avoid the obligations under this Exhibit 1.3(c) but will at all times in
                                         --------------
good faith assist in carrying out the provisions hereof in order to protect the
rights of Hughes under this Exhibit 1.3(c) against impairment.
                            --------------
<PAGE>
 
                                                                  EXHIBIT 1.4(F)
                                                                  --------------



                                April __, 1995

Whittaker Corporation
10880 Wilshire Boulevard
Los Angeles, California  90024

Gentlemen:

I have acted as counsel to Hughes Aircraft Company, a Delaware corporation
("Hughes"), in connection with the sale by Hughes to Whittaker Corporation, a
Delaware corporation ("Whittaker"), of the stock of Hughes LAN Systems, Inc. a
California corporation (the "Company") pursuant to the Stock Purchase Agreement
dated as of March 23, 1995 (the "Purchase Agreement") by and between Hughes and
Whittaker.  This letter is being delivered to you pursuant to Section 1.4(f) of
the Purchase Agreement.  Capitalized terms defined in the Purchase Agreement and
not otherwise defined herein shall have the meanings given them therein for
purposes of this letter.

As such counsel, I have examined such matters of fact and questions of law as I
have considered appropriate for purposes of rendering the opinions expressed
below.  I have also examined or caused to be examined such corporate records,
agreements, documents and other instruments, and such certificates or comparable
documents of public officials and of officers and representatives of Hughes and
of the Company, and have made such inquiries of such officers and
representatives as I have deemed relevant and necessary as a basis for the
opinions hereinafter set forth.

In my examination, I have assumed the genuineness of all signatures (other than
those provided on behalf of Hughes), the authenticity of all documents submitted
to me as originals, the conformity to original documents of documents submitted
to me as certified or photostatic copies and the authenticity of the originals
of such latter documents.  As to all questions of fact material to this opinion
that have not been independently established, I have relied upon the
representations and warranties of the parties contained in the Purchase
Agreement.

I am opining herein as to the effect on the subject transaction only of the
federal laws of the United States, the internal laws of the State of California
and the General Corporation Law of the State of Delaware as in effect on the
date hereof.  I express no opinion with respect to the applicability thereto, or
the effect on the subject transaction, of the laws of any other jurisdiction, or
as to any matters of municipal law or the laws of any local agencies within any
state. Further, my opinions in paragraph 3 below are based upon my consideration
of only those statutes, rules and regulations which, in my experience, are
normally applicable to transactions of the type provided for in the 
<PAGE>
 
Page 2
April __, 1995


Purchase Agreement and the Related Documents and which are in effect on the date
hereof in the jurisdictions referred to above.

To the extent that the obligations of Hughes may be dependent on such matters, I
assume for purposes of this opinion that the Purchase Agreement and the other
Related Documents have been duly authorized, executed and delivered by Whittaker
and that each such agreement constitutes the legally valid and binding
obligation of Whittaker, enforceable against it in accordance with its terms.

Subject to the foregoing and to the other limitations, qualifications and
exceptions set forth below, I am of the opinion, as of the date hereof, that:

1.     The Company is a corporation duly organized, validly existing, and in
good standing under the laws of the State of California and is qualified to do
business as a foreign corporation in the states listed in the Schedule 3.1 of
                                                              ------------   
the Hughes Disclosure Schedule, which, to the Knowledge of Hughes, are the only
states where such qualification is necessary under applicable Governmental
Regulations and where the failure to be so qualified would cause a Material
Adverse Effect.  The Company has full corporate power and authority to own its
Assets and to carry on its Business.  Hughes has full corporate power and
authority to enter into the Purchase Agreement and the Related Documents and to
carry out the transactions contemplated thereby.

2.     The Board of Directors of Hughes has taken all action required by law to
authorize the execution and delivery of the Purchase Agreement and the Related
Documents and the transactions contemplated thereby.  The Purchase Agreement and
the Related Documents are each a valid and binding obligation of Hughes
enforceable against it in accordance with its terms, except as may be limited by
applicable bankruptcy, insolvency, reorganization, moratorium or similar laws
relating to or limiting creditors' rights generally and subject to general
principles of equity (regardless of whether considered in a proceeding at law or
in equity), including, without limitation (i) the possible unavailability of
specific performance, injunctive relief or any other equitable remedy, and (ii)
concepts of materiality, reasonableness, good faith and fair dealing.

3.     Neither the execution and delivery of the Purchase Agreement and the
Related Documents nor the consummation of the transactions contemplated thereby
will (a) violate any provisions of the Certificate of Incorporation or Bylaws of
Hughes or the Articles of Incorporation or Bylaws of the Company, (b) violate,
or be in conflict with, or constitute a material default under or cause the
acceleration of the maturity of any debt or obligation pursuant to, any material
agreement or commitment to which Hughes or, to my knowledge, the Company, is a
party or by which Hughes or, to my knowledge, the Company, is bound, or (c)
violate any Governmental Regulation applicable to Hughes or, to the Knowledge of
Hughes, the Company.  No consent, approval or authorization of, or declaration,
filing or registration with, any Governmental Authority is required in
connection with the execution, delivery and performance of this Agreement or the
Related Documents by Hughes and the consummation of the transactions
<PAGE>
 
Page 3
April __, 1995


contemplated hereby and thereby, except as set forth in Schedule 3.3 of the
                                                        ------------       
Hughes Disclosure Schedule.

4.     The authorized capital stock of the Company consists of 1,000 shares of
common stock, no par value, all of which are presently issued and outstanding
and owned beneficially and of record by Hughes, free and clear of all Liens
(except the rights of Whittaker under the Purchase Agreement).  The Stock is
duly authorized, fully paid, nonassessable and validly issued.  To my knowledge,
no options, warrants, conversion privileges, preemptive rights, rights of first
refusal or other rights, agreements or commitments are presently outstanding to
purchase any of the capital stock of the Company except as provided in the
Purchase Agreement.

5.     Except as disclosed in Schedule 3.13 of the Hughes Disclosure Schedule,
                              -------------                                   
there is no claim, legal action, counterclaim, suit, arbitration, governmental
investigation, or other legal, administrative or tax proceeding, nor any order,
decree or judgment, in progress or pending, or, to my knowledge, threatened,
against or relating to the Company that, if adversely determined, would have a
Material Adverse Effect.

6.     The delivery of the certificate representing the Stock in the manner
provided in Section 1.4(a) of the Purchase Agreement will transfer to Whittaker
good and valid title to the Stock, free and clear of all Liens other than Liens
created or suffered to exist by Whittaker.

The opinions expressed above are subject  to the following limitations,
qualifications and exceptions:

          (a)   In rendering the opinion in paragraph 3 with respect to the sale
     of the Stock to Whittaker as contemplated by the Purchase Agreement, I have
     relied upon the representations of Whittaker in Section 4.10 of the
     Purchase Agreement.

          (b)   Certain remedial or procedural provisions contained in the
     Purchase Agreement or the Related Documents may be limited or rendered
     unenforceable by applicable law, but such limitations do not, in my
     opinion, make the remedies and procedures that are available to Whittaker
     inadequate for the practical realization of the benefits purported to be
     provided to it.

          (c)   The enforceability of provisions in the Purchase Agreement or
     the Related Documents to the effect that terms may not be waived or
     modified except in writing may be limited under certain circumstances.

          (d)   California law may limit the amount of attorneys' fees that can
     be recovered under certain circumstances and provides that, where a
     contract permits one party to the contract to recover attorneys' fees, the
     prevailing party in any action to enforce any provision of the contract
     shall be entitled to recover its reasonable attorneys' fees.
<PAGE>
 
Page 4
April __, 1995


This opinion is rendered only to Whittaker and is solely for its benefit in
connection with the transactions covered hereby.  No other Person shall be
entitled to rely on the opinions expressed herein without my express written
consent.  This opinion may not be relied upon for any other purpose, or quoted
to any other Person for any purpose, without my express written consent.

                                            Very truly yours,



                                            Larry D. Hunter        
                                            Senior Corporate Counsel
                                            Hughes Aircraft Company 
<PAGE>
 
                                                                EXHIBIT 1.5(B)
                                                                --------------

                         REGISTRATION RIGHTS AGREEMENT
                         -----------------------------


     REGISTRATION RIGHTS AGREEMENT (this "Agreement"), dated as of this _____
day of April, 1995, by and between HUGHES AIRCRAFT COMPANY, a Delaware
corporation ("Hughes"), and WHITTAKER CORPORATION, a Delaware corporation
("Whittaker").

                                   Recitals
                                   --------

     A.   Whittaker and Hughes are parties to that certain Stock Purchase
Agreement dated as of March 23, 1995 ("Purchase Agreement"), pursuant to which
                                       ------------------                     
Hughes has agreed to sell to Whittaker, and Whittaker has agreed to purchase
from Hughes, all of the outstanding capital stock ("HLS Shares") of Hughes LAN
Systems, Inc., a California corporation ("HLS").

     B.   As partial consideration for the HLS Shares, Whittaker has agreed to
issue and deliver to Hughes $15,000,000 in original principal amount of
indebtedness denominated as Whittaker's 7% Convertible Subordinated Note (the
"Note", which includes any replacement Note or Note issued upon subdivision or
in exchange for the original Note, all as provided therein).  Subject to the
terms and conditions contained therein, the Note is convertible into shares of
common stock, par value $.01 per share, of Whittaker ("Common Stock").

     C.   As further inducement to Hughes to enter into the Purchase
Agreement, Whittaker has agreed to grant to Hughes, on the terms and subject to
the conditions hereinafter set forth, the right to cause Whittaker to register
the Registrable Securities (as defined below) under the Securities Act of 1933,
as amended, or any successor statute thereto (the "1933 Act").

     D.   This Agreement is executed and delivered at the Closing,
concurrently with the execution and delivery of the Note by Whittaker to Hughes.

     THEREFORE, the parties hereto hereby agree as follows:

     1.   Certain Additional Definitions.  As used in this Agreement,
          ------------------------------                             
capitalized terms not otherwise defined herein shall have the meanings given
them in the Purchase Agreement and the following capitalized terms shall have
the following respective meanings:

                                       
<PAGE>
 
     "Conversion Date" means the date on which Hughes shall have elected to
      ---------------                                                      
convert the Note into Registrable Securities, in accordance with the terms of
the Note.

     "Registrable Securities" means any shares of Common Stock or other security
      ----------------------                                           
which may be issued upon conversion of the Note in accordance with the terms
thereof or which may thereafter be issued or distributed in respect thereof by
way of stock dividend or stock split or other distribution, recapitalization or
reclassification. Registrable Securities shall cease to be such (and rights
relating to such Registrable Securities hereunder shall terminate) when (i) a
registration statement with respect to the sale of such securities shall have
become effective under the 1933 Act and such securities shall have been disposed
of in accordance with such registration statement, (ii) such securities shall
have been transferred, sold or otherwise disposed of by Hughes pursuant to Rule
144 (or any successor provision) under the 1933 Act, (iii) [they shall have been
otherwise transferred and new certificates for such securities not bearing a
legend restricting further transfer shall have been delivered by Whittaker
pursuant to Section 9 hereof and the subsequent disposition of such securities
shall not require registration or qualification of them under the 1933 Act or
any state securities or blue sky law then in force, or (iv) such securities
shall have ceased to be outstanding.

     "Registration Expenses" means any and all expenses incident to
      ---------------------                                        
performance of or compliance with this Agreement, including, without limitation,
(i) all Securities and Exchange Commission (the "SEC") and stock exchange or
National Association of Securities Dealers, Inc. (the "NASD") registration and
filing fees (including, if applicable, the fees and expenses of any "qualified
independent underwriter" as such term is defined in Schedule E to the By-laws of
the NASD, and of its counsel), (ii) all fees and expenses of complying with
securities or blue sky laws of state securities regulatory authorities
(including fees and disbursements of counsel for the underwriters in connection
with blue sky qualifications of the Registrable Securities), (iii) all printing,
messenger and delivery expenses, (iv) all fees and expenses incurred in
connection with the listing of the Registrable Securities on any securities
exchange or quotation system pursuant to clause (viii) of Section 4 hereof and
(v) the fees and disbursements of counsel for Whittaker and of its independent
public accountants, including the expenses of any "cold comfort" letters
required by or incident to such performance and compliance, but shall not
include (x) underwriting discounts, selling commissions and stock transfer
taxes, if any, applicable to the sale of the Registrable Securities, or (y) the
fees and disbursements of counsel for Hughes.

     2.   Incidental Registration. (a) Right to Include Registrable
          -----------------------      ----------------------------
Securities.  If, at any time after the Conversion Date, Whittaker proposes to
- ----------                                                                   
register shares of Common Stock under the 1933 Act (other than a registration on
Form S-4 or S-8, or any successor or other forms promulgated for similar
purposes), whether or not for sale for its own account, in a manner which would
permit registration of Registrable 

                                       2
<PAGE>
 
Securities for sale to the public under the 1933 Act, it will, at each such
time, give prompt written notice to Hughes of its intention to do so and of the
rights of Hughes under this Section 2. Upon the written request of Hughes made
within 20 days after the receipt of any such notice (which request shall specify
the Registrable Securities intended to be disposed), Whittaker will use its best
efforts to effect the registration under the 1933 Act of all Registrable
Securities which Whittaker has been so requested to register by Hughes, to the
extent requisite to permit the disposition of the Registrable Securities so to
be registered; provided, however, that (i) if, at any time after giving written
               --------  -------                 
notice of its intention to register any securities and prior to the effective
date of the registration statement filed in connection with such registration,
Whittaker shall determine for any reason not to proceed with the proposed
registration of the securities to be sold by it, Whittaker may, at its election,
give written notice of such determination to Hughes and, thereupon, shall be
relieved of its obligation to register any Registrable Securities in connection
with such registration (except as set forth in paragraph (b) of this Section 2),
and (ii) if such registration involves an underwritten offering, Hughes must
sell its Registrable Securities that it has requested be included in such
registration to the underwriters selected by Whittaker on the same terms and
conditions as apply to Whittaker, with such differences, including with respect
to indemnification, as may be customary or appropriate in combined primary and
secondary offerings at the time of such registration. If a registration
requested pursuant to this Section 2 involves an underwritten public offering,
Hughes may elect, in writing at least five days prior to the effective date of
the registration statement filed in connection with such registration, not to
register the Registrable Securities in connection with such registration.

     (b)  Expenses. Whittaker, Hughes and each other Person, if any,
          --------                                                   
registering securities will share all Registration Expenses incurred in
connection with each registration of Registrable Securities requested pursuant
to this Section 2 pro rata based on the percentage that the respective gross
proceeds received by Hughes, Whittaker or such other Person bear to the total
gross proceeds from such registration; provided, that in the event Whittaker
                                       --------                             
shall for any reason decide not to proceed with such registration, as described
in clause (i) of the proviso in the immediately preceding paragraph, then Hughes
shall have no liability for Registration Expenses incurred in connection with
such abandoned registration.

     (c)  Priority in Incidental Registration.  If a registration pursuant to
          -----------------------------------                                
this Section 2 involves an underwritten offering and the managing underwriter
advises Whittaker that, in its opinion, the number of securities requested to be
included in such registration exceeds the number which can be sold in such
offering, so as to be likely to have an adverse effect on the price, timing or
distribution of the securities offered in such offering as contemplated by
Whittaker (other than the Registrable Securities), then Whittaker will include
in such registration (i) first, 100% of the securities Whittaker proposes to
sell for its own account, (ii) second, the number of Registrable Securities
requested by Hughes which, in the opinion of 

                                       3
<PAGE>
 
such managing underwriter, can be sold without having the adverse effect
referred to above and (iii) third, the number of securities requested by any
other Persons to be included in such registration which, in the opinion of such
managing underwriter, can be sold without having the adverse effect referred to
above on either the securities to be offered by Whittaker or Hughes in such
registration.

     3.   Registration on Demand.  (a)  Demand.  If, at any time after the
          ----------------------        ------
Conversion Date, Hughes shall deliver a written notice (a "Demand Notice") to
Whittaker demanding that Whittaker effect the registration (a "Demand
Registration") under the 1933 Act of all or part of the Registrable Securities
and specifying the amount and intended method of disposition thereof, Whittaker
will, as expeditiously as possible, use its best efforts to effect the
registration under the 1933 Act of all such Registrable Securities which
Whittaker has been so requested to register by Hughes, all to the extent
necessary to permit the disposition (in accordance with the intended method
thereof as aforesaid) of the Registrable Securities to be so registered;
provided, that, Whittaker shall be entitled to postpone, on only one occasion,
the filing of a registration statement requested under this Section 3 for up to
90 days if the Board of Directors of Whittaker shall determine in good faith, in
a duly adopted resolution, that such filing would require public disclosure of
matters which would be materially detrimental to Whittaker if publicly disclosed
at such time.  Except as contemplated by the last sentence of paragraph (b) of
this Section 3 or in paragraph (f) of this Section 3, Hughes shall be entitled
to deliver only one Demand Notice pursuant to this paragraph (a).  Subject to
paragraph (f) of this Section 3, Whittaker may include securities other than the
Registrable Securities, for its account or the account of other Persons, in a
Demand Registration effected pursuant to this Section 3(a).

     (b)  Effective Registration Statement.  A registration requested pursuant
          --------------------------------
to this Section 3 will not be deemed to have been effected unless it has been
declared effective by an order of the SEC; provided, that if, within the 90 day
period referred to in clause (ii) of Section 4 hereof, the offering of
Registrable Securities pursuant to such registration is not completed due to any
stop order, injunction or other order or requirement of the SEC or other
government agency or court, such registration will be deemed not to have been
effected.  If Hughes shall demand registration of the Registrable Securities as
provided in Section 3(a), but the registration is deemed not to have been
effected as provided in the preceding sentence, then, each such time this
occurs, Hughes will be entitled to one additional Demand Registration hereunder;
provided that under no circumstances shall Whittaker be required to undertake
any Demand Registration (i) more than once in any 12-month period, or (ii) in
respect of less than 300,000 shares of Common Stock (such number and
classification of shares to be appropriately adjusted by the parties in the
event of any reclassification, stock dividend, stock split or other change in
the Common Stock for which such adjustment is appropriate) at any particular
time.

     (c)  Registration Statement Form.  If any registration requested pursuant
          --------------------------- 
to this Section 3, which is proposed by Whittaker to be effected by the filing
of a 

                                       4
<PAGE>
 
registration statement on Form S-3 (or any successor or similar short-form
registration statement) shall be in connection with an underwritten public
offering, and if the managing underwriter shall advise Whittaker in writing
that, in its opinion, the use of another form of registration statement is of
material importance to the success of such proposed offering, then such
registration shall be effected on such other form.

     (d)  Expenses.  Whittaker will pay all Registration Expenses in
          --------
connection with a Demand Registration of Registrable Securities pursuant to this
Section 3.

     (e)  Selection of Underwriters.  If a Demand Registration pursuant to
          -------------------------
this Section 3 involves an underwritten offering, Whittaker shall have the right
to select the investment banker or bankers and managers to administer the
offering;  provided, however, that such investment banker or bankers or managers
           --------  -------
shall be nationally recognized and reasonably satisfactory to Hughes.

     (f)  Priority in Demand Registrations.  If a Demand Registration involves
          --------------------------------
an underwritten offering and the managing underwriter advises Whittaker in
writing that, in its opinion, the number of securities requested to be included
in such registration (including securities of Whittaker or any other Person(s)
which are not Registrable Securities) exceeds the number which can be sold in
such offering, without having an adverse effect on the pricing, timing or
distribution of the Registrable Securities offered in such offering, Whittaker
will include (i) first, 100% of the Registrable Securities requested by Hughes
to be included in such registration, and (ii) second, the number of securities
to be offered on account of Whittaker or any other Person(s) requesting to be
included in such registration, which, in the opinion of such managing
underwriter, will not have the adverse effect referred to in this paragraph (f).
If, as a result of the advice of the underwriters as provided above, less than
all the Registrable Securities requested by Hughes to be included in such
registration are so included then, each such time this occurs, Hughes will be
entitled to one additional Demand Registration hereunder; provided that under no
circumstances shall Whittaker be required to undertake any Demand Registration
(i) more than once in any 12-month period, or (ii) in respect of less than
300,000 shares of Common Stock (such number and classification of shares to be
appropriately adjusted by the parties in the event of any reclassification,
stock dividend, stock split or other change in the Common Stock for which such
adjustment is appropriate) at any particular time.

     (g)  Additional Rights.  If Whittaker at any time grants to any other
          -----------------
holders of Common Stock any rights to demand or otherwise require Whittaker to
effect the registration under the 1933 Act of any such shares of Common Stock on
terms more favorable to such holders than the terms set forth in this Section 3,
the terms of this Section 3 shall be deemed amended or supplemented to the
extent necessary to provide Hughes such more favorable rights and benefits.

                                       5
<PAGE>
 
     4.   Registration Procedures.  If and whenever Whittaker is required to
          -----------------------
use its best efforts to effect or cause the registration of any Registrable
Securities under the 1933 Act as provided in this Agreement, Whittaker will, as
expeditiously as possible:

          (i) prepare and, in any event within 60 days after a Demand Notice
     for registration has been given to Whittaker, file with the SEC a
     registration statement with respect to such Registrable Securities and use
     its best efforts to cause such registration statement to become effective:

          (ii) prepare and file with the SEC such amendments and supplements
     to such registration statement and the prospectus used in connection
     therewith as may be necessary to keep such registration statement effective
     (A) in the case of an incidental registration under Section 2 hereof, for
     such period as Whittaker elects, or (B) in the case of a Demand
     Registration under Section 3 hereof, for a period of at least of 90
     consecutive days or until such earlier date as all of the Registrable
     Securities included in such registration statement have been sold, and to
     comply in all material respects with the provisions of the 1933 Act, the
     Securities Exchange Act of 1934, as amended, or any successor statute
     thereto (the "1934 Act"), and the rules and regulations of the SEC
     thereunder with respect to the disposition of the Registrable Securities
     covered by such registration statement during such period in accordance
     with the intended methods of disposition thereof set forth in such
     registration statement; provided, that before filing a registration
     statement or prospectus, or any amendments or supplements thereto,
     Whittaker will furnish to counsel selected pursuant to Section 7 hereof by
     Hughes, copies of all documents proposed to be filed, which documents will
     be subject to the review of such counsel;

          (iii) furnish to Hughes such number of copies of such registration
     statement and of each amendment and supplement thereto (in each case
     including all exhibits filed therewith, including any documents
     incorporated by reference), such number of copies of the prospectus
     included in such registration statement (including each preliminary
     prospectus and summary prospectus) and such other documents as Hughes may
     reasonably request in order to facilitate the disposition of the
     Registrable Securities;

          (iv) use its best efforts to register or qualify such Registrable
     Securities covered by such registration in such jurisdictions in the United
     States as Hughes shall reasonably request, in the case of a Demand
     Registration, and do any and all other acts and things which may be
     reasonably necessary or advisable to enable Hughes to consummate the
     disposition in such jurisdictions of the Registrable Securities, except
     that Whittaker shall not for any such purpose be required to qualify
     generally to do business as a foreign corporation in any jurisdiction
     where, but for the

                                       6
<PAGE>
 
     requirements of this clause (iv), it would not be obligated to be so
     qualified, to subject itself to taxation in any such jurisdiction, or to
     consent to general service of process in any such jurisdiction;

          (v) use its best efforts to cause such Registrable Securities covered
     by such registration statement to be registered with or approved by such
     other governmental agencies or authorities as may be necessary to enable
     Hughes to consummate the disposition of such Registrable Securities;

          (vi) notify Hughes at any time when a prospectus relating to such
     registration statement is required to be delivered under the 1933 Act
     within the appropriate period mentioned in clause (ii) of this Section 4 of
     Whittaker's becoming aware that the prospectus included in such
     registration statement, as then in effect, includes an untrue statement of
     a material fact or omits to state a material fact required to be stated
     therein or necessary to make the statements therein not misleading in the
     light of the circumstances then existing, and at the demand of Hughes,
     prepare and furnish to Hughes a reasonable number of copies of an amended
     or supplemental prospectus as may be necessary so that, as thereafter
     delivered to the purchasers of such Registrable Securities, such prospectus
     shall not include an untrue statement of a material fact or omit to state a
     material fact required to be stated therein or necessary to make the
     statements therein not misleading in the light of the circumstances then
     existing;

          (vii) otherwise use its best efforts to comply in all material
     respects with all applicable rules and regulations of the SEC, and make
     available to its security holders, as soon as reasonably practicable (but
     not more than eighteen months) after the effective date of the registration
     statement, an earnings statement which shall satisfy the provisions of
     Section 11(a) of the 1933 Act and the rules and regulations promulgated
     thereunder (including Rule 158 or any successor rule thereto);

          (viii) use its best effort to list such Registrable Securities on any
     securities exchange or quotation system on which the Common Stock is then
     listed or quoted, if such Registrable Securities are not already so listed
     and if such listing is then permitted under the rules of such exchange or
     quotation system, and to provide a transfer agent and registrar for such
     Registrable Securities covered by such registration statement not later
     than the effective date of such registration statement;

          (ix) enter into such customary agreements (including an underwriting
     agreement in customary form) and take such other actions as Hughes and the
     underwriters, if any, reasonably request in order to expedite or facilitate
     the disposition of such Registrable Securities;

                                       7
<PAGE>
 
          (x)   obtain a "cold comfort" letter or letters from Whittaker's
     independent public accountants in customary form and covering matters of
     the type customarily covered by "cold comfort" letters as Hughes and the
     underwriters, if any, shall reasonably request;

          (xi)  make available for inspection by Hughes, by any underwriter
     participating in any disposition to be effected pursuant to such
     registration statement and by any attorney, accountant or other agent
     retained by Hughes or any such underwriter, all pertinent financial and
     other records, pertinent corporate documents and properties of Whittaker,
     and cause all of Whittaker's officers, directors and employees to supply
     all information reasonably requested by Hughes, or any such underwriter, or
     any such attorney, accountant or agent in connection with such registration
     statement provided that Whittaker may require, as a condition to such
     inspection, that any such person agrees to maintain the confidentiality of
     such information as contemplated by Section 8 of this Agreement;

          (xii) notify counsel (selected pursuant to Section 7 hereof) for
     Hughes and the managing underwriter, if any, immediately, and confirm the
     notice in writing (A) when the registration statement, or any post-effect
     amendment to the registration statement, shall have become effective, or
     any supplement to the prospectus or any amendment prospectus shall have
     been filed, (B) of the receipt of any comments from the SEC, (C) of any
     request of the SEC to amend the registration statement or amend or
     supplement the prospectus or for additional information, and (D) if the
     issuance by the SEC of any stop order suspending the effectiveness of the
     registration statement or of any order preventing or suspending the use of
     any preliminary prospectus, or of the suspension of the qualification of
     the registration statement for offering or sale in any jurisdiction, or of
     the institution or threatening of any proceedings for any of such purposes;

          (xiii) make every reasonable effort to prevent the issuance of any
     stop order suspending the effectiveness of the registration statement or of
     any order preventing or suspending the use of any preliminary prospectus
     and, if any such order is issued, to obtain the withdrawal of any such
     order at the earliest possible moment;

          (xiv) if requested by the managing underwriter, if any, or by Hughes,
     promptly incorporate in a prospectus supplement or post-effective amendment
     such information as such managing underwriter or Hughes reasonably requests
     to be included therein, including, without limitation, with respect to the
     number of Registrable Securities being sold to such underwriter, the
     purchase price being paid therefor by such underwriter and other terms of
     the underwritten offering of the Registrable Securities; and make all
     required filings of such prospectus supplement or post-effective amendment
     as soon as practicable after being notified of the matters incorporated in
     such prospectus supplement or post-effective 

                                       8
<PAGE>
 
     amendment as soon as practicable after being notified of the matters 
     incorporated in such prospectus supplement or post-effective amendment

          (xv)  cooperate with Hughes and the managing underwriter, if any, to
     facilitate the timely preparation and delivery of certificates (not bearing
     any restrictive legends) representing securities to be sold under the
     registration statement, and enable such securities to be in such
     denominations and registered in such names as the managing underwriter, if
     any, or Hughes may request;

          (xvi) use its best efforts to obtain for delivery to Hughes and to
     the managing underwriter, if any, an opinion or opinions from counsel for
     Whittaker which shall be in customary form for comparable transactions and
     in form, substance and scope reasonably satisfactory to Hughes, the
     underwriters and their counsel; and

          (xvii) cooperate with Hughes and each managing underwriter
     participating in the disposition of such Registrable Securities and their
     respective counsel in connection with any filings required to be made with
     the NASD.

     Whenever in the process of effecting the registration of Registrable
Securities pursuant to this Agreement, Whittaker may require Hughes to furnish
Whittaker with such information regarding Hughes and pertinent to the disclosure
requirements relating to the registration and the distribution of such
securities as Whittaker may from time to time reasonably request in writing.

     Hughes agrees that, upon receipt of any notice from Whittaker of the
happening of any event of the kind described in clause (vi) of this Section 4,
Hughes will forthwith discontinue disposition of Registrable Securities pursuant
to the registration statement covering such Registrable Securities until receipt
of the copies of the supplemented or amended prospectus contemplated by clause
(vi) of this Section 4, and, if so directed by Whittaker, Hughes will deliver to
Whittaker (at Whittaker's expense) all copies, other than permanent file copies
then in Hughes' possession, of the prospectus covering such Registrable
Securities current at the time of receipt of such notice. In the event Whittaker
shall have given any such notice, the period mentioned in clause (ii) of this
Section 4 shall be extended by the number of days during the period from and
including the date of the giving of such notice pursuant to clause (vi) of this
Section 4 and including the date when Hughes shall have received the copies of
the supplemented or amended prospectus contemplated by clause (vi) of this
Section 4.

     5.   Indemnification.  (a)  Indemnification by Whittaker.  In the event
          ---------------        ----------------------------
of any registration of any Registrable Securities under the 1933 Act pursuant to
Section 2 or 3 hereof, Whittaker will, and hereby does, agree to indemnify and
hold harmless, 

                                       9
<PAGE>
 
to the extent permitted by law, Hughes, each affiliate of Hughes and their
respective directors and officers (including any director, officer, affiliate,
employee, agent and controlling Person of any of the foregoing), each other
Person who participates as an underwriter in the offering or sale of such
Registrable Securities and each other Person, if any, who controls Hughes or any
such underwriter within the meaning of the 1933 Act (collectively, the
"Indemnified Parties" and individually, an "Indemnified Party"), against any and
all losses, claims, damages or liabilities, joint or several, and expenses
(including reasonable attorney's fees and reasonable expenses of investigation)
to which such Indemnified Party may become subject under the 1933 Act, common
law or otherwise, insofar as such losses, claims, damages or liabilities (or
actions or proceedings in respect thereof, whether or not such Indemnified Party
is a party thereto) arise out of or are based upon (i) any untrue statement or
alleged untrue statement of any material fact contained in any registration
statement under which such securities were registered under the 1933 Act, any
preliminary, final or summary prospectus contained therein, or any amendment or
supplement thereto, or (ii) any omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein (in the case of a prospectus, in light of the circumstances under which
they were made) not misleading, and Whittaker will reimburse such Indemnified
Party for any legal or any other expenses reasonably incurred by it in
connection with investigating or defending any such loss, claim, liability,
action or proceeding; provided, that Whittaker shall not be liable to any
Indemnified Party in any such case to the extent that any such loss, claim,
damage, liability (or action or proceeding in respect thereof) or expense arises
out of or is based upon any untrue statement or alleged untrue statement or
omission or alleged omission made in such registration statement or amendment or
supplement thereto or in any such preliminary, final or summary prospectus in
reliance upon and in conformity with written information furnished to Whittaker
through an instrument duly executed by Hughes or any underwriter specifically
stating that it is for use in the preparation thereof; and further provided,
that Whittaker will not be liable to any Person who participates as an
underwriter in the offering or sale of Registrable Securities or any other
Person, if any, who controls such underwriter within the meaning of the 1933
Act, under the indemnity agreement in this Section 5(a) with respect to any
preliminary prospectus or the final prospectus or the final prospectus as
amended or supplemented, as the case may be, to the extent that any such loss,
claim, damage or liability of such underwriter or controlling Person results
from the fact that such underwriter sold Registrable Securities to a Person to
whom there was not sent or given, at or prior to the written confirmation of
such sale, a copy of the final prospectus (including any documents incorporated
by reference therein) or of the final prospectus as then amended or supplemented
(including any documents incorporated by reference therein), whichever is most
recent, if Whittaker has previously furnished copies thereof to such
underwriter. Such indemnity shall remain in full force and effect regardless of
any investigation made by or on behalf of Hughes or any Indemnified Party and
shall survive the transfer of such securities by Hughes.

                                      10
<PAGE>
 
     (b)  Indemnification by Hughes.  In the event of any registration of any
          -------------------------
Registrable Securities under the 1933 Act pursuant to Section 2 or 3 hereof,
Hughes will, and hereby does, agree to indemnify and hold harmless (in the same
manner and to the same extent as set forth in paragraph (a) of this Section 5)
Whittaker, each affiliate of Whittaker and their respective directors and
officers (including any director, officer, affiliate, employee, agent and
controlling Person of any of the foregoing), with respect to any statement or
alleged statement in or omission or alleged omission from such registration
statement, any preliminary, final or summary prospectus contained therein, or
any amendment or supplement, if such statement or alleged statement or omission
or alleged omission was made in reliance upon and in conformity with written
information furnished to Whittaker through an instrument duly executed by Hughes
specifically stating that it is for use in the preparation of such registration
statement, preliminary, final or summary prospectus or amendment or supplement,
or a document incorporated by reference into any of the foregoing.  Such
indemnity shall remain in full force and effect regardless of any investigation
made by or on behalf of Whittaker or any of its respective affiliates,
directors, officers or controlling Persons and shall survive the transfer of
such securities by Hughes.  In no event shall the liability of Hughes hereunder
be greater in amount than the net proceeds received by Hughes upon the sale of
the Registrable Securities giving rise to such indemnification obligation.

     (c)  Notices of Claims, Etc.  Promptly after receipt by an indemnified
          ----------------------
party hereunder of written notice of the commencement of any action or
proceeding with respect to which a claim for indemnification may be made
pursuant to this Section 5, such indemnified party will, if a claim in respect
thereof is to be made against an indemnifying party, give written notice to the
latter of the commencement of such action; provided, that the failure of the
indemnified party to give notice as provided herein shall not relieve the
indemnifying party of its obligations under the preceding subdivisions of this
Section 5, except and only to the extent that the indemnifying party is actually
prejudiced by such failure to give notice.  In case any such action is brought
against an indemnified party, unless in such indemnified party's reasonable
judgment a conflict of interest between such indemnified party and the
indemnifying party may exist in respect of such claim, the indemnifying party
will be entitled to participate in and to assume the defense thereof, jointly
with any other indemnifying party similarly notified to the extent that it may
wish, with counsel reasonably satisfactory to such indemnified party, and after
notice from the indemnifying party to such indemnified party of its election so
to assume the defense thereof, the indemnifying party will not be liable to such
indemnified party for any legal or other expenses subsequently incurred by the
latter in connection with the defense thereof other than reasonable costs of
investigation.  No indemnifying party will consent to entry of any judgment or
enter into any settlement which does not include as an unconditional term
thereof the giving by the claimant or plaintiff to such indemnified party of a
release from all liability in respect to such claim or litigation.

                                      11
<PAGE>
 
     (d)  Other Indemnification.  Indemnification similar to that specified in
          ---------------------
the preceding subdivisions of this Section 5 (with appropriate modifications)
shall be given by Whittaker and Hughes with respect to any required registration
or other qualification of securities under any United States federal or state
law or regulation or governmental authority other than the 1933 Act.

     (e)  Contribution.  If the indemnification provided for in this Section 5
          ------------
is unavailable to an indemnified party, then each applicable indemnifying party,
in lieu of indemnifying such indemnified party, shall contribute to the amount
paid or payable by such indemnified party as a result of such losses, claim,
damages or liabilities in such proportion as is appropriate to reflect the
relative fault of Whittaker on the one hand and Hughes on the other in
connection with the statements or omissions which resulted in such losses,
claims, damages or liabilities, as well as any other relevant equitable
considerations.  The relative fault of Whittaker on the one hand and of Hughes
on the other shall be determined by reference to, among other things, whether
the untrue or alleged untrue statement of a material fact or the omission, or
alleged omission, to state a material fact relates to information supplied by
Whittaker or by Hughes and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission.
The amount paid or payable by a party as a result of the losses, claims, damages
and liabilities referred to above shall be deemed to include any legal or other
fees or expenses reasonably incurred by such party in connection with
investigating or defending such action or claim.
 
     Whittaker and Hughes agree that it would not be just and equitable if
contribution pursuant to this Section 5 were determined by prorata allocation or
by any other method of allocation which does not take account of the equitable
considerations referred to in the immediately preceding paragraph.  No person
guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of
the 1933 Act) shall be entitled to contribution from any person who was not
guilty of such fraudulent misrepresentation.

     (f)  Non-Exclusivity.  The obligations of the parties under this Section 
          ---------------
5 shall be in addition to any liability which any party may otherwise have to
any other party.

     6.     Rule 144.  Whittaker covenants that, so long as Hughes holds the 
            --------
Note or any Registrable Securities, Whittaker will file the reports required to
be filed by it under the 1933 Act and the 1934 Act and the rules and regulations
adopted by the SEC thereunder (or, if Whittaker is not required to file such
reports, it will, upon the request of Hughes, make publicly available such
information), and it will take such further action as Hughes may reasonably
request, all to the extent required from time to time to enable Hughes to sell
the Note or Registrable Securities without registration under the 1933 Act
within the limitation of the exemptions provided by (i) Rule 144 under the 1933
Act, as such rule may be amended from time to time, or (ii) any similar rule or
regulation hereafter adopted by the SEC. Upon the request of 

                                      12
<PAGE>
 
Hughes, Whittaker will deliver to Hughes a written statement as to whether it
has complied with the public disclosure requirements of any such rule or
regulation.

     7.     Selection of Counsel.  In connection with any registration of 
            --------------------
Registrable Securities pursuant to Section 2 or 3 hereof, Hughes may select
counsel to represent it in connection with such registration and such counsel
shall be permitted to be present during all stages of the preparation of any
registration statement and prospectus in which the Registrable Securities are to
be included and to have access to such information and individuals as is
specified in clause (xi) of Section 4 hereof. Except as otherwise provided in
Section 5 hereof, Hughes will pay all fees and disbursements of such counsel.

     8.     Confidentiality.  Hughes shall treat, and shall cause its 
            ---------------
representatives to treat, as confidential all information ("Confidential
Information") provided to it or its representatives pursuant to paragraph (xi)
of Section 4 hereof; provided, however, that Confidential Information shall not
include information which (i) is or becomes generally available to the public
other than as a result of a disclosure by Hughes or such representatives, (ii)
was available to Hughes or such representatives on a nonconfidential basis prior
to its disclosure pursuant to such paragraph (xi), or (iii) becomes available to
Hughes or its representatives on a nonconfidential basis from a Person other
than Whittaker or any affiliate of Whittaker who is not otherwise bound by a
confidentiality agreement with Whittaker or any such affiliate.

     9.     Restrictions on Transfer of Registrable Securities.  (a)  
            --------------------------------------------------
Restrictive Legend.  Whittaker and Hughes agree that from and after the
- ------------------
Conversion Date:

     (i)    except as otherwise provided in clause (ii), each certificate
            representing Registrable Securities, other than Registrable
            Securities issued upon conversion of a Note which does not, in
            accordance with the terms of the Note, bear a legend restricting
            transfer, shall be stamped or otherwise imprinted with a legend
            substantially similar to the following (in addition to any legend
            required under applicable state securities laws): "

            THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE
            SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD OR
            TRANSFERRED, ASSIGNED, PLEDGED OR HYPOTHECATED UNLESS AND UNTIL
            REGISTERED UNDER SUCH ACT OR UNLESS THE COMPANY HAS RECEIVED AN
            OPINION OF COUNSEL OR OTHER EVIDENCE, REASONABLY SATISFACTORY TO THE
            COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED."

                                      13
<PAGE>
 
     (ii)   certificates representing Registrable Securities bearing the
            foregoing legend may be exchanged from time to time for unlegended
            certificates upon receipt by Whittaker of a written request for such
            exchange accompanied by an opinion of counsel, or other evidence,
            reasonably satisfactory to Whittaker, to the effect that such
            securities no longer represent "restricted securities" within the
            meaning of Rule 144(a)(3) under the 1933 Act.

     (b)  Transfer Restriction. Hughes (or any subsequent transferee) agrees
          --------------------
that it will not make any sale, transfer or other disposition of Registrable
Securities which bear the legend referred to in paragraph (a) of this Section 9,
except in compliance with the terms of such legend.

     10.  Miscellaneous.  (a)  Holdback Agreement.  If any registration 
          -------------        ------------------
effected in accordance with this Agreement shall be in connection with an
underwritten public offering, Hughes agrees not to effect any public sale or
distribution, including any sale pursuant to Rule 144 under the 1933 Act, of any
equity securities of Whittaker, or of any security convertible into or
exchangeable or exerciseable for any equity securities of Whittaker (in each
case, other than as part of such underwritten public offering), within 7 days
before or 180 days (or such lesser period as the managing underwriters may
permit) after the effective date of such registration (except as part of such
registration).

     (b)  Amendments and Waivers.  This Agreement may not be amended, and no
          ----------------------
provision hereof shall be waived, except by writing signed by the parties hereto
or, in the case of a waiver, by the party waiving compliance therewith, which
states that it is intended to amend or waive a provision of this Agreement.  Any
waiver of any rights or failure to act in a specific instance shall relate only
to such instance and shall not be construed as an agreement to waive any rights
or failure to act in any other instance, whether or not similar.

     (c)  Successors, Assigns and Transferees.  This Agreement shall be binding
          -----------------------------------
upon and shall inure to the benefit of the parties hereto and their respective
successors and assigns.  The rights and obligations of Hughes arising hereunder
may be transferred or assigned by Hughes (or any subsequent proposed transferor)
as an entirety or in part to one non-affiliated transferee (with such transferee
having the similar right of transfer or assignment), or may be transferred or
assigned by Hughes to any one or more affiliated companies (with Hughes and all
its affiliates to be treated as one Person for purposes of this Agreement);
provided that (i) such transferee shall have been issued a Note, in accordance
with the terms of the Note originally issued to Hughes or shall have acquired
not less than 300,000 shares of Common Stock (subject to adjustment as provided
in paragraph (b) of Section 3 hereof), and (ii) such proposed transferee has
agreed to be bound by the terms of this Agreement, including the transfer
restrictions in Section 9, if and to the extent applicable to such transferee as
if it were Hughes.

                                      14
<PAGE>
 
     (d)  Notices.  All notices and other communications provided for hereunder
          -------
 shall be in writing and shall be sent by mail, postage-prepaid, return receipt
requested, or by telex, telecopier, hand delivery or Federal Express courier, to
the addresses set forth in the Purchase Agreement and shall be effective as
provided therein.

     (e)  Descriptive Headings.  The headings in this Agreement are for 
          --------------------
convenience of reference only and shall not limit or otherwise affect the
meaning of terms contained herein.

     (f)  Severability.  If any one or more of the provisions, paragraphs, 
          ------------
words, clauses, phrases or sentences contained herein, or the application
thereof in any circumstances, is held invalid, illegal or unenforceable in any
respect for any reason, the validity, legality and enforceability of any such
provision, paragraph, word, clause, phrase or sentence in every other respect
and of the remaining provisions, paragraphs, words, clauses, phrases or
sentences hereof shall not be in any way impaired, it being intended that all
rights, powers and privileges of the parties hereto shall be enforceable to the
fullest extent permitted by law.

     (g)  Counterparts.  This Agreement may be executed in two or more 
          ------------
counterparts, and by different parties on separate counterparts, each of which
shall be deemed an original, but all such counterparts shall together constitute
one and the same instrument.

     (h)  GOVERNING LAW.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED AND
          -------------
ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF CALIFORNIA APPLICABLE TO
CONTRACTS MADE AND TO BE WHOLLY PERFORMED IN SUCH STATE (WITHOUT REGARD TO THE
CHOICE OF LAW PROVISIONS THEREOF).

     (i)  Specific Performance.  The parties hereto acknowledge and agree that
          --------------------
irreparable damage would occur in the event that any of the provisions of this
Agreement were not performed in accordance with their specific terms or were
otherwise breached.  Accordingly, it is agreed that they shall be entitled to an
injunction or injunctions to prevent the breach of any provision of this
Agreement and to enforce specifically the terms and provisions hereof in any
court of competent jurisdiction in the United States or any state thereof, in
addition to any other remedy to which they may be entitled at law or equity.

     (j)  Entire Agreement.  This Agreement constitutes the entire agreement 
          ----------------
between the parties hereto in respect of the subject matter hereof, and
supersedes any and all prior or contemporaneous oral or written agreements in
respect of such subject matter.

                                      15
<PAGE>
 
     IN WITNESS WHEREOF, each of the undersigned has executed this Agreement or
causes this Agreement to be executed on its behalf as of the date first written
above.

                                           WHITTAKER CORPORATION
                         
                                           By:  _________________________
                         
                                           ______________________________
                                           Title
                         
                                           HUGHES AIRCRAFT COMPANY
                         
                                           By:  _________________________
                         
                                           ______________________________
                                           Title

                                                                               
                                                                            
                                                                               
                                                                               
                                                                            
                                                                               
                                      16 








                                                                               
<PAGE>
 
[WHITTAKER LOGO                                           [WHITTAKER CORPORATION
APPEARS HERE]                                              LETTERHEAD APPEARS 
                                                           HERE]


APRIL ______, 1995



Hughes Aircraft Company
7200 Hughes Terrace
Los Angeles, CA  90045



Gentlemen:

I have acted as counsel for Whittaker Corporation, a Delaware corporation
("Whittaker"), in connection with the purchase by Whittaker of the outstanding
capital stock of Hughes LAN Systems, Inc. (the "Company") pursuant to that
certain Stock Purchase Agreement dated as of march 23, 1995 (the "Purchase
Agreement") by and between Whittaker and Hughes Aircraft Company, a Delaware
corporation ("Hughes").  Capitalized terms defined in the Purchase Agreement and
not otherwise defined herein shall have the meanings given them therein for
purposes of this letter.

In connection with this transaction, and as the basis for the opinion stated
below, I have examined and relied upon the originals or copies certified to my
satisfaction of such corporate records, documents, certificates, and other
instruments as are in my judgment necessary and appropriate, and have made such
inquiries of such officers and representatives as i have deemed relevant and
necessary in order to render the opinion expressed below.

For purposes of this opinion, I have assumed the genuineness of all signatures,
the authenticity of all documents submitted to me as original, the conformity to
original documents of documents submitted to me as certified or photostatic
copies, and the authenticity of the originals of such latter documents.  As to
all questions of fact material to this opinion that have not been independently
established, I have relied upon the representations and warranties of the
parties as contained in the purchase agreement.




                                 EXHIBIT 1.5D
<PAGE>
 
Hughes Aircraft Company
April ______, 1995
Page 2





To the extent that the obligations of Whittaker may be dependent on such
matters, I assume for purposes of this opinion that the Purchase Agreement and
the other Related Documents have been duly authorized, executed, and delivered
by Hughes and that each such agreement constitutes the legally valid and binding
obligation of Hughes, enforceable against it in accordance with its terms. Where
reference is made in this opinion to "my knowledge," it means my actual
knowledge.

Subject to the foregoing and to the other limitations, qualifications, and
exceptions set forth below, i am of the opinion, as of the date hereof, that:

1.   Organization and Authority.  Whittaker is a corporation duly organized,
     --------------------------                                             
validly existing, and in good standing under the laws of the State of Delaware
and is qualified to do business as a foreign corporation in all states where
such qualification is necessary under applicable Governmental Regulations and
where the failure to be so qualified would cause a Material Adverse Effect.
Whittaker has full corporate power and authority to own its assets and to carry
on its business as now being conducted.  Whittaker has full corporate power and
authority to enter into this Agreement and the Related Documents and to carry
out the transactions contemplated hereby and thereby.

2.   Authorization and Binding Obligation.  The Board of Directors of Whittaker
     ------------------------------------                                      
has taken all action required by law to authorize the execution and delivery of
the Purchase Agreement and the Related Documents and the transactions
contemplated hereby and thereby; and the Purchase Agreement is, and when
executed by Whittaker, each Related Document will be, a valid and binding
obligation of Whittaker enforceable against it in accordance with its terms,
except as may be limited by bankruptcy, insolvency, moratorium, or other laws
affecting creditors' rights generally and general principles of equity.

3.   Absence of Conflicting Agreements or Consents.  Neither the execution and
     ---------------------------------------------                            
delivery of the Purchase Agreement and the Related Documents nor the
consummation of the transactions contemplated hereby and thereby will (a)
violate any provisions of the Certificate of Incorporation or Bylaws of
Whittaker, (B) Subject to Section 9.9 of the Purchase Agreement, Violate, or be
in conflict with, or constitute a material default under, or cause the
acceleration of the maturity of any debt or obligation pursuant to, any material
agreement or commitment to which Whittaker is a party or by which Whittaker is
bound, or (c) violate any Governmental Regulation applicable to Whittaker.  No


                                 EXHIBIT 1.5D
<PAGE>
 
Hughes Aircraft Company
April ______, 1995
Page 3


consent, approval, or authorization of, or declaration, filing, or registration
with, any Governmental Authority is required in connection with the execution,
delivery, and performance of this Agreement or the Related Documents by
Whittaker and the consummation of the transactions contemplated hereby and
thereby, except as set forth in Schedule 4.3 of the Whittaker Disclosure
Schedule.

4.   Capitalization.  The authorized capital stock of Whittaker consists of
     --------------                                                        
40,000,000 shares of common stock, par value $.01 per share ("Whittaker Common
Stock") and 5,000,000 shares of preferred stock, par value $1 per share
("Whittaker Preferred Stock").  Schedule 4.4 of the Whittaker Disclosure
Schedule accurately sets forth, as of the date hereof, all of the issued and
outstanding shares of Whittaker Common Stock and of Whittaker Preferred Stock,
as well as all options, warrants, conversion privileges, preemptive rights,
rights of first refusal or other rights, agreements or commitments which are
presently outstanding to purchase any of the capital stock of Whittaker.  Upon
issuance of the Note to Hughes in accordance with the Purchase Agreement, the
Note will be duly authorized and validly issued and the requisite number of
shares of Whittaker Common Stock will have been reserved for issuance upon
conversion of the note in accordance with such Note, and upon conversion of all
or part of the Note into Whittaker Common Stock in accordance with the Note, if
such conversion occurs, the shares of Whittaker Common Stock issued to Hughes
will be duly authorized, validly issued, fully paid, and nonassessable, and will
be free of preemptive or other similar rights.

5.   Legal Claims and Action.  Except as disclosed in Schedule 4.6 of the
     -----------------------                                             
Whittaker Disclosure Schedule, there is no claim, legal action, counterclaim,
suit, arbitration, governmental investigation, or other legal, administrative,
or tax proceeding, neither is there any order, decree, or judgment, in progress
or pending, or, to my knowledge, threatened, against or relating to whittaker or
any of its subsidiaries that, if adversely determined, would have a Material
Adverse Effect.

I am qualified to practice law only in the State of California, and I express no
opinion as to the laws of other jurisdictions other than the federal laws of the
United States and the General Corporation Law of the State of Delaware.  Insofar
as the laws of any other jurisdiction are relevant to the opinion expressed
herein, I have either relied upon the opinion of counsel qualified to practice
in such jurisdictions or have assumed that such laws are not materially
different from the corresponding 
<PAGE>
 
Hughes Aircraft Company
April ______, 1995
Page 4




laws of the state of California.

This opinion is solely for the information of the addressee hereof, and is not
to be quoted in whole or in part or otherwise referred to, neither is it to be
filed with any governmental agency or other person without my prior written
consent.  Other than the addressee hereof, no one is entitled to rely on this
opinion.

Very truly yours,



Gordon J. Louttit
GJL:dva
<PAGE>
 
                              HUGHES LAN SYSTEMS
                   Statement of Working Captial (Unaudited)
                               December 25, 1994
                               Schedule 1.6 (A)
                               ---------------- 

<TABLE>
<CAPTION>
Current Assets:
<S>                                                                  <C>       
    Cash                                                                 $25.0 
    Receivables                                                        9,246.0 
    Unbilled Receivables                                               1,013.0 
    Inventories                                                        8,423.0 
    Prepaid Expenses                                                     702.0 
                                                                     ---------- 
    Total Current Assets                                              19,409.0 
                                                                     ----------

 
LESS

 
Current Liabilities
    Accounts Payable                                                 $ 5,945.0 
    Accrued Liabilities                                                2,202.0 
    Accrued Benefits/Payroll                                           2,016.0 
                                                                     ----------
    Total Current Liabilities                                         10,163.0 
                                                                     ---------- 

                                                                     ----------
WORKING CAPITAL                                                      $ 9,246.0 
                                                                     ========== 
</TABLE>
<PAGE>
 
                                                                  EXHIBIT 1.6(B)
                                                                  --------------

                             EXCLUDED ADJUSTMENTS
                             --------------------


The Proposed Statement of Working Capital (and any proposed adjustments thereto)
shall be prepared so as to remove the effects, if any resulting from any change
in Working Capital, or the components thereof, caused by any of the following,
which shall be separately reflected as an exhibit to such Proposed Statement of
Working Capital:  (a)  a change in GAAP, including accounting pronouncements,
promulgated or implemented by Hughes or the Company after December 25, 1994,
regardless of whether or not such change is otherwise required to be adopted,
except as otherwise agreed by Hughes and Whittaker;  (b)  a change of an
accounting policy, practice, procedure, allocation method or estimation
technique from that following in the preparation of the December 25 Statement;
(c)  any corrections relating to mathematical mistakes, mistakes in the
application of accounting principles, or oversight or misuse of facts that
existed at December 25, 1994 and affected the determination of any amounts in
the December 25 Statement;  (d)  any write-ups or write-downs or similar
revaluations in the book value of any of the assets or liabilities included in
the determination of Working Capital in the December 25 Statement, and also
included in the Proposed Statement of Working Capital, which has not resulted
directly from changes, after December 25, 1994, in facts and circumstances that
are objective and verifiable and not solely within the discretion of either
party;  (e)  the inclusion in the Proposed Statement of Working Capital of any
asset or liability which was not, but could have been, reflected in the December
25 Statement;  and (f) any change in the amount, or method of determining,
reserves and allowances, except for any change resulting directly from any
change after December 25, 1994 in facts and circumstances that are objective and
verifiable and not solely within the discretion of either party.
<PAGE>
 
                                                                  Exhibit 8.3(b)
                                                                  --------------
                           Non-Competition Agreement
                           ------------------------- 

     THIS NON-COMPETITION AGREEMENT ("Agreement") is made as of April ___, 1995,
by and between Hughes Aircraft Company, a Delaware corporation ("Hughes"),
Hughes Network Systems, Inc., a Delaware corporation ("HNS"), and Whittaker
Corporation, a Delaware corporation ("Whittaker").

                                   Recitals
                                   --------

     A.   Hughes and Whittaker have entered into a Stock Purchase Agreement
dated as of March 23, 1995 (the "Purchase Agreement"), relating to the sale of
all the issued and outstanding capital stock of Hughes LAN Systems, Inc., a
California corporation (the "Company"), by Hughes to Whittaker.

     B.   It is a condition to the consummation of the transactions provided for
in the Purchase Agreement that the parties enter into this Agreement in order,
among other things, to assure Whittaker that Hughes and its subsidiaries, in
particular HNS and its subsidiaries, will not engage in certain business
activities which could reasonably be expected to impair the goodwill of the
Company.

     C.   This Agreement is entered into at the Closing under the Purchase
Agreement.

     THEREFORE, Hughes agrees with Whittaker as follows:

     1.   Effect of Agreement.  This Agreement is a "Related Document" as
          -------------------
defined in the Purchase Agreement. For purposes of this Agreement, capitalized
terms not otherwise defined herein shall have the meanings given them in the
Purchase Agreement.

     2.   Non-Compete.
          -----------

          (a)  In consideration of the benefits to Hughes under the Purchase
     Agreement and the Related Documents and to induce Whittaker to consummate
     the transactions provided for in the Purchase Agreement, (i) Hughes agrees
     that, except as otherwise provided in Section 3 of this Agreement, for a
     period of three years after the Closing Date neither Hughes nor any
     subsidiary of Hughes (collectively, the "Hughes Companies"), will (A)
     engage in the sale of products in competition with the Company Products, as
     defined in paragraph (b) of this Section 2, or (B) otherwise compete with
     the Company's Business, as defined in
<PAGE>
 
     paragraph (c) of this Section 2, in any country in which the Company
     engages in the Company's Business as of the Closing Date and (ii) in
     addition to the limitations imposed under clause (i), but without the
     exceptions in Section 3(a) of this Agreement, HNS agrees that, for a period
     of three years after the Closing Date, neither HNS nor any subsidiary of
     HNS will engage in the sale of the following Company Products: (x)
     Enterprise Hub Products (as such term is defined in Exhibit 1.3(c) of the
     Purchase Agreement; (y) standalone (stackable) concentrators; and (z)
     standalone terminal servers.

          (b)  For purposes of this Agreement, "Company Products" shall mean any
     of the products of the Company as they exist at the Closing Date, as
     described in the attached product data sheets, and any enhancements of any
     of such products for use in non-severe environments.

          (c)  For purposes of this Agreement, "Company's Business" means the
     development, production and sale of intelligent hubs which are targeted at
     the high end of the intelligent networking market.

     3.   Exclusions and Limitations.
          --------------------------  
 
          (a)  Notwithstanding anything in Section 2 to the contrary, the
     following activities of any of the Hughes Companies shall not be subject to
     the restrictions in paragraph (a) of Section 2 and shall not be considered
     either "Company Products" or in competion with the "Company's Business" for
     purposes of this Agreement, except, as to HNS and its subsidiaries, as
     otherwise provided in Section 2(a)(ii):

                (i)  the development, production or sale of any product
          (including enhancements of any product) which, at the Closing Date,
          has been produced or sold by, or has been under development for more
          than six months by, any of the Hughes Companies other than the Company
          (collectively, "Hughes Products");

               (ii)  the development, production or sale of any product which is
          otherwise included in the definition of "Company Product" but which is
          sold by any of the Hughes Companies as part of a larger system in
          which Hughes Products constitute the primary products or which is sold
          as a spare or replacement part of or for such larger system; and

              (iii)  activities within the core businesses of Hughes as
          conducted by the Hughes Companies as of the Closing Date not
<PAGE>
 
          directly competitive with the Company's Business, including defense
          and automotive electronics, systems design and engineering, satellite
          design, construction and services, VSAT networks, digital cellular
          telephony and direct broadcast satellite television or other similar
          services.

          (b)  The restrictions in Section 2 shall not apply to any business
     activity, product line or Affiliated Company which is acquired by any of
     the Hughes Companies (an "Acquired Business"), subject to the following
     restrictions which shall apply during the three year period after the
     Closing Date:

                (i)  the primary business activity of the Acquired Business
          shall not be competitive with the Company's Business nor shall such
          Acquired Business engage primarily in the sale of Company Products;

               (ii)  promptly after the completion of the acquisition of the
          Acquired Business, Hughes shall offer to Whittaker an option at fair
          market value to acquire the portion of the Acquired Business which
          competes with the Company's Business or engages in the sale of Company
          Products (collectively, the "Restricted Portion"), subject to
          applicable legal restrictions, in accordance with paragraph (c) of
          this Section 3; and

              (iii)  until expiration of the three year period after the Closing
          Date, Hughes shall maintain the Restricted Portion as a separate
          operation, not using the Hughes name, and shall not integrate such
          Restricted Portion into the other operations of the Hughes Companies
          (that is, shall continue to operate the Restricted Portion as part of
          the Acquired Business in a manner substantially consistent with the
          operation of such Restricted Portion prior to the acquisition by
          Hughes), except and only to the extent that these limitations would
          not be appropriate taking into consideration the provisions of
          paragraph (a) of this Section 3.

          (c)  The option provided for in clause (ii) of paragraph (b) of this
     Section 3 shall be subject to the following procedures:

                (i)  Hughes shall notify Whittaker promptly (the "Hughes
          Notice") after the completion of the acquisition by Hughes, which
          Hughes Notice shall identify the Restricted Portion in reasonable
          detail. Whittaker shall have 60 days from the date of the Hughes
          Notice to conduct reasonable due diligence with regard to the
          Restricted Portion and to advise Hughes of its interest in exercising
<PAGE>
 
          the option hereunder, by notice to Hughes within such 60-day period
          ("Whittaker Notice").

               (ii)  For a period of 30 days after the date of the Whittaker
          Notice, Hughes and Whittaker shall endeavor in good faith to negotiate
          the terms of the proposed purchase by Whittaker of the Restricted
          Portion. If Hughes and Whittaker are unable to agree on the terms of
          the purchase within such period, the fair market value for the
          Restricted Portion, and the other material terms of the transaction,
          shall be established by arbitration in accordance with the Purchase
          Agreement. In determining fair market value, the arbitrators shall be
          bound to value the Acquired Business at the price paid by Hughes, but
          shall be free to determine the appropriate allocation of that price
          between the Restricted Portion and the remainder of the Acquired
          Business. The arbitrators shall perform the valuation and determine
          any other material terms of the transaction that are in dispute as
          promptly as possible, but shall not revise the terms of the
          transaction that are not in dispute.

              (iii)  Except as otherwise provided below, Hughes and Whittaker
          shall execute a purchase agreement, and consummate the transaction, on
          the terms agreed by the parties or established by arbitration, as soon
          as possible after final determination of the terms. Notwithstanding
          the foregoing, if the terms are established by arbitration, Whittaker,
          in its sole discretion, may elect to withdraw the Whittaker Notice, in
          which case the parties shall not be obligated to execute the purchase
          agreement or consummate the transaction as provided above by written
          notice delivered to Hughes within ten days after final determination
          of the terms by arbitration.

     4.   Remedies.  Notwithstanding anything in the Purchase Agreement to the
          --------
contrary, Whittaker's sole remedy for breach of this Agreement by Hughes or any
of the Hughes Companies shall be specific performance, injunctive and other
equitable relief to prevent or restrain a breach of this Agreement or to enforce
the provisions of this Agreement.  In addition, if there is a dispute between
Hughes and Whittaker regarding the meaning of "Company Products", "Company's
Business" or any exceptions thereto as provided in this Agreement, Whittaker
shall not be entitled to any remedy until arbitration of such dispute is
completed and a decision in Whittaker's favor is entered by the arbitrators, who
shall be technically qualified to evaluate the respective businesses and
products involved.  In no event shall Hughes be obligated to indemnify Whittaker
for any actual or alleged Damages arising from any actual or alleged breach of
this Agreement.
<PAGE>
 
     5.   Miscellaneous.
          -------------   

          (a)  If any portion of the restrictive covenants set forth in Section
     2 is held to be unreasonable, arbitrary or against public policy, then each
     such covenant shall be considered divisible both as to time, geographical
     area and any other relevant feature, it being the intention of the parties
     that a lesser period of time, geographical area or other relevant feature
     shall be enforced so long as the same is not unreasonable, arbitrary or
     against public policy. If any provision in this Agreement is held illegal,
     void or invalid, the remaining provisions of this Agreement shall not be
     affected or impaired but shall remain binding in accordance with their
     terms.

          (b)  The relevant provisions in Article XIII of the Purchase Agreement
     shall apply to this Agreement and are incorporated herein by this
     reference.

IN WITNESS WHEREOF, this Agreement has been executed by the duly authorized
officers of Whittaker and Hughes as of the date first written above.

HUGHES AIRCRAFT COMPANY       WHITTAKER CORPORATION



By:____________________       By:__________________
Its:                          Its:                     

 
HUGHES NETWORK SYSTEMS, INC.



By:____________________
Its:
<PAGE>
 
                                                                  Exhibit 8.4(C)
                                                                  --------------

                        Hughes Aircraft Company
                        -----------------------

     RETENTION PLAN FOR KEY EMPLOYEES OF HUGHES LAN SYSTEMS, INC.
     ------------------------------------------------------------


1.   PURPOSE

     The Hughes Aircraft Company ("Hughes") Retention Plan ("Plan") for Key
     Employees of Hughes LAN Systems, Inc. ("HLS") is adopted by Hughes in
     connection with the proposed sale of HLS to Whittaker Corporation
     ("Whittaker") pursuant to the Stock Purchase Agreement dated as of March
     23, 1995 ("Agreement").

     In consultation with Whittaker, Hughes has determined that it is desirable
     to provide certain incentives to specified key employees of HLS, to induce
     such employees to remain in the employ of HLS for a sufficient period to
     assure continuity of the operations of HLS following the sale to Whittaker,
     thereby maximizing the value of HLS to Hughes and, following the completion
     of the sale pursuant to the Agreement, to Whittaker.

2.   PARTICIPANTS

     Participation in the Plan shall be limited to those HLS employees listed in
     the attached Appendix 1 ("Participants") who shall have executed and
     delivered to Hughes, on or before the Closing Date under the Agreement,
     such legal documents as are required by Hughes to evidence his or her
     acceptance of this Plan and release of Hughes and its parent corporations,
     subsidiaries and affiliates (and their respective officers and directors)
     from any claims associated with their employment by Hughes or HLS through
     the Closing Date, including any claims relating to or arising out of any
     bonus or incentive compensation plans or severance arrangements
     ("Release"). If a person listed in the attached Appendix 1 fails or refuses
     to sign such a Release on or before the Closing Date, such person shall not
     be considered a "Participant" and shall not be eligible to participate in
     this Plan.

3.   ELIGIBILITY

     A Participant shall be eligible to receive a Retention Payment under this
     Plan if on the Closing Date under the Agreement, such Participant is an
     active, full-time employee of HLS and has signed the Release. To continue
     to be eligible to receive the applicable Retention Payment or installment
     thereof, each Participant must remain in the employ of HLS or 
<PAGE>
 
     Whittaker on the payment date specified in Section 4.1 of this Plan, unless
     the Participant is terminated by HLS or Whittaker after the Closing Date
     without cause and through no fault of such Participant or such Participant
     dies or is disabled and unable to continue employment (a "Permitted
     Termination"). A Participant shall not be eligible to receive any unpaid
     Retention Payment if such Participant voluntarily ceases employment with
     HLS or Whittaker prior to the applicable payment date specified in Section
     4.1 of this Plan or if the employment of such Participant by HLS or
     Whittaker is terminated prior to such payment date for cause (a
     "Nonpermitted Termination").

4.   AWARDS

     4.1  PAYMENT DATES

          For eligible Participants who meet the requirements in Sections 2 and
          3 of this Plan, payments of the Retention Award shall be made as
          follows:

          (a)    100% of the Retention Award shall be paid to each eligible
                 Participant as to whom a Permitted Termination occurs within
                 six months after the Closing Date, such payment to be made no
                 later than ten days after the date of such Permitted
                 Termination;

          (b)    as to any eligible Participant who shall not have received
                 payment as provided in (a) above, (i) 25% of the Retention
                 Award shall be paid to such eligible Participant on the date
                 which is six months after the Closing Date under the Agreement;
                 and (ii) the remaining 75% of the Retention Award shall be paid
                 to such eligible Participant on the date which is the first to
                 occur of (A) 12 months after the Closing Date under the
                 Agreement or (B) within ten days after the date of a Permitted
                 Termination of such eligible Participant.

          Notwithstanding the foregoing, if a Nonpermitted Termination shall
          occur as to any eligible Participant prior to the applicable date on
          which such eligible Participant is entitled to be paid the Retention
          Award, or portion thereof, as provided above, such Participant shall
          cease to be an eligible Participant on the date of such Nonpermitted
          Termination and shall have no further rights under this Plan.

     4.2  AMOUNT OF RETENTION AWARD
<PAGE>
 
          Individual Retention Awards for each Participant shall be as specified
          opposite such Participant's name in Appendix 1. Any Retention Award
          which is not paid to a Participant shall not be reallocated to other
          Participants.

     4.3  TAX WITHHOLDING

          Retention Awards under this Plan will be reduced by any amounts
          required to be withheld under federal, state and local laws.

     4.4  PAYMENT BY WHITTAKER OR HLS

          In accordance with the Agreement, Hughes has appointed Whittaker as
          agent for Hughes to make the payments of Retention Awards to each
          Participant under this Plan. Such payments may be made by Whittaker or
          by HLS, but if Whittaker or HLS fails or refuses to make the payments
          of Retention Awards in accordance with this Plan, then Hughes shall
          make such payments directly to the eligible Participants as provided
          herein but shall have no further liability to any Participant under
          this Plan. This Plan shall be an unfunded, general obligation and
          payments shall be made in cash. Payments under this Plan shall not be
          included in compensation for purposes of determining benefits under
          any retirement plan or other company benefit plan of HLS, Whittaker or
          Hughes.

5.   EMPLOYMENT

     5.1  NO GUARANTEE OF CONTINUED EMPLOYMENT

          Nothing in this Plan shall be construed as a contract of employment or
          as a right of any Participant to be continued in the employment of
          Hughes, HLS or Whittaker, or as a limitation of the right of any of
          them to discharge any Participant at any time, with or without notice
          and with or without cause.

     5.2  RESTRICTION ON REEMPLOYMENT BY HUGHES

          For a period of two years after the Closing Date, no Participant may
          return to Hughes or any of its subsidiaries except as otherwise
          approved by Whittaker.

6.   ARBITRATION
<PAGE>
 
          All disputes, claims or controversies that arise under or with respect
          to this Plan shall, to the extent not resolved by amicable negotiation
          between the affected parties, be settled and finally determined by
          binding arbitration in accordance with the Commercial Arbitration
          Rules of the American Arbitration Association. The arbitration shall
          be conducted within 50 miles of the principal office of HLS or such
          other place in the United States as the parties may determine.
          Judgment upon the arbitral award may be entered in any court having
          jurisdiction.
<PAGE>
 
                                  APPENDIX 1

     This Appendix 1 consists of the attached eight pages, which list, on each 
page, one Participant and the amount of such Participant's Retention Award.

<PAGE>
 
<TABLE> 
<CAPTION> 
                  Name of Participant         Retention Award
                  -------------------         ---------------
                  <S>                         <C> 
                    Edward Barrera                $60,000
</TABLE> 

<PAGE>
 

<TABLE> 
<CAPTION> 
                  Name of Participant         Retention Award
                  -------------------         ---------------
                  <S>                         <C> 
                       M. Bosse                   $50,000
</TABLE> 

<PAGE>
 
<TABLE> 
<CAPTION> 
                  Name of Participant         Retention Award
                  -------------------         ---------------
                  <S>                         <C> 
                      J. Cameron                  $60,000
</TABLE> 
<PAGE>
 
<TABLE> 
<CAPTION> 
                  Name of Participant         Retention Award
                  -------------------         ---------------
                  <S>                         <C> 
                      W. Hubbard                  $60,000
</TABLE> 
<PAGE>
 
<TABLE> 
<CAPTION> 
                  Name of Participant         Retention Award
                  -------------------         ---------------
                  <S>                         <C> 
                      Dan Keller                  $60,000
</TABLE> 
<PAGE>
 
<TABLE> 
<CAPTION> 
                  Name of Participant         Retention Award
                  -------------------         ---------------
                  <S>                         <C> 
                    Joseph Kennedy               $250,000
</TABLE> 

<PAGE>
 
<TABLE> 
<CAPTION> 
                  Name of Participant         Retention Award
                  -------------------         ---------------
                  <S>                         <C> 
                        D. Wick                   $50,000
</TABLE> 
<PAGE>
 
<TABLE> 
<CAPTION> 
                  Name of Participant         Retention Award
                  -------------------         ---------------
                  <S>                         <C> 
                       T. Zimmer                  $90,000
</TABLE> 
<PAGE>
 
                                                                  EXHIBIT 8.5(A)
                                                                  --------------

                        TRANSITIONAL SERVICES AGREEMENT
                        -------------------------------


       THIS AGREEMENT is made as of April__, 1995, by and between Hughes
Aircraft Company, a Delaware corporation ("Hughes"), and Whittaker Corporation,
a Delaware corporation ("Whittaker").

                                   Recitals

       A.   Hughes and Whittaker have entered into a Stock Purchase Agreement
dated as of March 23, 1995 (the "Purchase Agreement"), relating to the sale of
all the issued and outstanding capital stock of Hughes LAN Systems, Inc., a
California Corporation (the ("Company");

       B.   The Purchase Agreement contemplates that Hughes and Whittaker shall
enter into an agreement relating to certain services to be provided by Hughes to
Whittaker or the Company, and by the Company to Hughes, with respect to certain
activities after the Closing Date under the Purchase Agreement.

       C.   This Agreement is executed and delivered at the Closing as provided
in the Purchase Agreement.

       THEREFORE, the parties agree as follows:

       1.   Effect of Agreement.  This Agreement is a "Related Document" as
            -------------------                                            
defined in the Purchase Agreement.  For purposes of this Agreement, (a)
references to Hughes or Whittaker include references to affected subsidiaries of
each, unless the context otherwise requires, and (b) capitalized terms not
otherwise defined herein shall have the meanings given them in the Purchase
Agreement.

       2.   Services.
            -------- 

            (a)    Hughes agrees to provide, or to cause its subsidiaries to
provide, to the Company during the term provided in Section 5, those
administrative and other services with respect to the Company described in
Exhibit A (the "Hughes Services"), on the terms specified in  Exhibit A and 
- ---------                                                     ---------  
Section 4.

            (b)    Whittaker agrees to cause the Company to provide to Hughes, 
during the term provided in Section 5, those services listed and described in 
Exhibit B (the "Company Services"), on the terms specified in Exhibit B and 
- ---------                                                     ---------    
Section 4.

            (c)    The Hughes Services and Company Services listed and 
described in Exhibits A and B (collectively, the "Services") are based on the 
             ----------------      
parties' understanding of the support, administrative and other services
reasonably required by each party at the date of this Agreement. If, following
the Closing, either party reasonably determines that additional services should
be provided by either party
<PAGE>
 
to the other party, the parties agree to negotiate in good faith to
appropriately modify this Agreement with respect to such additional services;
provided, however, that any such additional services shall be provided on a
basis substantially consistent with the recent historical practice of the
affected party; and provided, further, that neither party shall be obligated
under this sentence to agree to the provision of such additional services. Each
party to whom services are provided under this Agreement agrees to hold harmless
the individuals providing such services and their employers with respect to any
damage or loss arising from the conduct of such individuals in the course and
scope of their employment, except for gross negligence or willful misconduct.

       3.   Access to Facility/Relocation.
            ----------------------------- 

            (a)    As contemplated by the Purchase Agreement, the Company shall
have the right following the Closing to continue to have access to, and to
occupy and use, the portions of the offices of Hughes Aircraft Company or its
subsidiaries in the locations specified in Exhibit C (the "Hughes Offices")
                                           ---------   
presently occupied and used by the Company, on a basis substantially consistent
with the recent historical practice of the Company at the Hughes Offices, for
the term of this Agreement as provided in Section 5.  Attached as Exhibit D is 
                                                                  ---------   
Whittaker's proposed transition schedule for removing the Company's personnel
from the Hughes Offices. Any material deviations from such schedule (other than
with respect to the extension of the term of this Agreement with respect to the
Hughes Offices, which shall be governed by Section 5) which might adversely
affect Hughes shall be subject to the consent of Hughes, which consent shall not
be unreasonably withheld; however, deviations from the transition schedule which
accelerate the time schedule for completion of the removal shall not be subject
to Hughes' consent. Whittaker agrees to use reasonable efforts to complete the
transfer of the Company's personnel from the Hughes Offices as promptly as
possible.

            (b)    The access, occupancy and use of the Hughes Offices following
the Closing Date shall be at the expense and risk of the Whittaker, and the
Whittaker shall indemnify and hold harmless Hughes from and against any loss,
expense, damage, liability or claim (including reasonable attorneys' fees)
arising from the Company's negligence or misconduct during such access,
occupancy or use in accordance with Article XII of the Purchase Agreement.

            (c)    Whittaker covenants and agrees with Hughes and Hughes
covenants and agrees with Whittaker that it will not (and will accordingly
instruct all of its or the Company's employees, agents and representatives who
have access to the Hughes Offices) (i) interfere with the business of the other
party hereto, or (ii) disclose any confidential information which was made
available to it as a result of its joint access, occupancy and use of the Hughes
Offices pursuant to this Agreement. For purposes of this Section 3(c),
"confidential information" shall have the meaning give such term in the
Confidentiality Agreement. Hughes or Whittaker will be entitled to an
injunction, restraining order or other equitable relief from any court or



                                      -2-
                                      
<PAGE>
 
competent jurisdiction in the event of any breach by the other party of this
Section 3(c). Rights and remedies provided by this Section 3(c) are cumulative
and in addition to any other rights and remedies which Hughes or Whittaker may
have at law or equity.

       4.   Charges.
            ------- 

            (a)    With respect to those Hughes Services which Hughes has agreed
to provide the Company as indicated in Exhibit A hereto, Whittaker shall cause
                                       ---------
the Company to pay to Hughes on a monthly basis the amounts as determined by the
billing algorithm i n Exhibit A hereto, unless otherwise indicated in Exhibit A.
                      ---------                                       --------- 

            (b)    With respect to those Company Services which Whittaker has
agreed to cause the Company to provide to Hughes as indicated in Exhibit B
                                                                 --------- 
hereto, Hughes shall pay to Whittaker on a monthly basis the amounts as
determined by the billing algorithm in Exhibit B hereto, unless otherwise
indicated in Exhibit B.
             ---------

            (c)    For those Services for which no amount or billing methodology
is set forth on Exhibit A or Exhibit B, the party receiving the Service shall
                ---------    ---------
pay to the party providing the Service the Total Cost of the Service. For
purpose of this Agreement, the "Total Cost" of any Service provided shall be the
reasonable out of pocket cost incurred by the Service provider for labor,
material, expenses, overhead and general and administrative charges and
excluding fee or profit in connection with providing the Service in question.

            (d)    Charges for Services to be performed by Hughes or Whittaker
under this Agreement shall be invoiced on or about the twentieth business day of
the calendar month next following the calendar month in which such Services have
been performed, and such invoice shall be payable net 30 days following receipt
thereof.

       5.   Effectiveness; Term.  This Agreement shall become effective as of
            -------------------
the Closing Date.  The initial term of this Agreement shall commence on the
Closing Date and continue through ____________ , 1995.  Hughes or Whittaker
shall have the option of extending the term of this Agreement applicable to the
Services for additional period of three full calendar months by written notice
given to the other party not less than 60 days prior to the expiration of the
applicable initial term, subject to the written consent of the other party
(which consent will not be withheld without good cause).  If the term of this
Agreement is extended as provided above, all applicable terms and conditions of
this Agreement shall remain in effect during such extended term.

       6.   Standard of Performance.  The Services shall be performed in a
            ----------------------- 
timely, efficient and workmanlike manner.  Each party will use reasonable
efforts to make available the services which it is obliged to provide under this
Agreement in substantially the same manner as it makes the same services
available for its own operations, provided that a party shall not be liable to
the other party or any other

                                      -3-
<PAGE>
 
person as a result of the first party changing its manner of rendering the
services if the first party reasonably considers the same necessary or desirable
in the conduct of its own operations.

       7.   Proprietary and Confidential Information.  Each party agrees to
            ---------------------------------------- 
comply with the Confidentiality Agreement with respect to confidential
information obtained in the performance of Services.

       8.   Termination.
            ------------

            8.1    Termination Without Prior Notice.  Either party may
                   --------------------------------
immediately terminate this Agreement by written notice to the other party (a) in
the event of the other party's voluntary bankruptcy or insolvency, (b) in the
event that the other party shall make as assignment for the benefit of
creditors, or (c) in the event that a petition shall have been filed against the
other party under a bankruptcy law, a corporate reorganization law or any other
law for relief of debtors (or other law similar in purpose of effect), which
causes such other party to have its business effectively discontinued in its
then present form.

            8.2    Termination With Notice.  If either party (the "Defaulting
                   -----------------------
Party") shall fail adequately to perform in any material respect any of its
material obligations under this Agreement, whether voluntarily or involuntarily
or as a result of any law or regulation or otherwise, the other party may,
without prejudice to any other right which it may have, terminate this Agreement
upon 30 days' written notice (which shall be reduced to ten days' written notice
in the event of failure of a party to make payment in accordance with Section 4)
to the Defaulting Party specifying the respects in which the Defaulting Party
has so failed to perform its obligations under this Agreement, unless during
such period the Defaulting Party shall have remedied the specified default.

            8.3    Termination of Services.  Unless otherwise provided in 
                   -----------------------
Exhibit A or Exhibit B, Hughes or Whittaker may terminate any of the Services
being provided by the other party at any time during the term of the Agreement
by written notice sixty (60) days prior to requested termination date of such
Services.

       9.   Limitation of Liability.  Neither party shall be liable for any
            -----------------------
Consequential Damages in connection with, or arising out of, this Agreement or
the Services provided under this Agreement.

       10.  Disclaimer of Warranties.  EXCEPT AS EXPRESSLY SET FORTH IN THIS
            ------------------------
AGREEMENT, NEITHER HUGHES NOR WHITTAKER MAKES ANY REPRESENTATION OR WARRANTY
WHATSOEVER, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY
REPRESENTATION OR WARRANTY AS TO MERCHANTABILITY OF FITNESS FOR A PARTICULAR
PURPOSE, ARISING OUT OF THIS AGREEMENT OR THE SERVICES PROVIDED UNDER THIS
AGREEMENT.

                                      -4-
<PAGE>
 
       11.  Notices.  All notices, requests, demands and other communications
            -------
under this Agreement shall be given in accordance with the Purchase Agreement.

       12.  General.
            --------

            (a)    Hughes, Whittaker and the Company are independent contractors
and each shall be free to exercise its discretion and independent judgment as to
the method and means of performance of the Services contained in this Agreement.

            (b)    Each of Hughes and Whittaker agrees that it shall take
appropriate action by instruction of or agreement with its personnel to ensure
that all personnel performing Services under this Agreement shall be bound by
and comply with all of the terms and conditions of this Agreement, including,
but not limited to, the terms and conditions of Section 7.

            (c)    Either Hughes or Whittaker may subcontract or assign to any
subsidiary or affiliate the performance of any Services.  Except as provided in
the preceding sentence, neither Hughes nor Whittaker may subcontract or assign
the performance of any of the Services without prior written consent from the
other party, which consent shall not be unreasonably withheld.  Hughes or
Whittaker, as applicable, shall secure from each such third party performing
subcontracted Services hereof such third party's consent and agreement to comply
with the terms and conditions of this Agreement, including, but not limited to,
the terms and conditions of Section 7.

            (d)    Except as otherwise provided in this Agreement, neither party
hereto shall assign this Agreement or any rights or obligations hereunder
without the prior written consent of the other party hereto and any such
attempted assignment without such prior written consent shall be void and have
no force or effect.  This Agreement shall inure to the benefit of, and shall be
binding upon, the successors and permitted assigns of the parties hereto.

            (e)    Neither party shall be liable for any failure of, or delay in
the performance of, Services under this Agreement for the period that such
failure or delay is due to acts of God, public enemy, civil war, strikes or
labor disputes, or any other cause beyond such party's reasonable control.  Each
party agrees to notify the other party promptly of the occurrence of any such
cause and to carry out this Agreement as promptly as practicable after such
cause is terminated.

            (f)    This Agreement constitutes the entire agreement of the
parties with respect to the Services. This Agreement may be amended or modified
and any of the terms or conditions hereof may be waived, only by a written
instrument executed by the parties, or in the case of a waiver, by the party
waiving compliance. Any waiver by either party of any condition, or of the
breach of any provision or term in any one or more instances, shall not be
deemed to be nor construed as further or

                                      -5-
<PAGE>
 
continuing waiver of any such condition, or of the breach of any provision or
term of this Agreement.

            (g)    Nothing in this Agreement is intended to confer any rights or
remedies under or by reason of this Agreement on any persons other than Hughes
or Whittaker and their respective successors and permitted assigns.  Nothing in
this Agreement is intended to relieve or discharge the obligations or liability
of any third persons to Hughes or Whittaker.  No provision of this Agreement
shall give any third persons any right of subrogation or action over or against
Hughes or Whittaker.

            (h)    This Agreement shall be governed by, and construed and
enforced in accordance with, the internal laws of California.

            (i)    The section headings in this Agreement are for reference
purposes only and shall not affect the meaning or interpretation of this
Agreement.

            (j)    This Agreement may be executed in counterparts, each of which
shall be deemed an original, but all of which shall constitute the same
instrument.

            (k)    The relevant provisions in Article XIII of the Purchase
Agreement shall apply to this Agreement and are incorporated herein by this
reference.

       Executed on April __, 1995.
       
                                       HUGHES AIRCRAFT COMPANY


                                       By:_________________________

                                       Title:______________________


                                       WHITTAKER CORPORATION

                                       By:_________________________

                                       Title:______________________

                                      -6-
<PAGE>
 
                                                              EXHIBIT A
                                                              ---------
 
                               HUGHES SERVICES
                               ---------------

                    To be establised prior to Closing Cate

<PAGE>
 
                                                                EXHIBIT B
                                                                ---------

                               COMPANY SERVICES
                               ----------------

                    To be established prior to Closing Date








                                      -2-

<PAGE>
 
                                                                EXHIBIT C
                                                                ---------

                                HUGHES OFFICES
                                --------------

                    To be established prior to closing Date











                                      -3-


<PAGE>
 
                                                                 EXHIBIT D
                                                                 ---------


                              TRANSITION SCHEDULE
                              -------------------

                    To be established prior to Closing Date








                                      -4-

<PAGE>
 
                                  EXHIBIT 8.7



                        INTELLECTUAL PROPERTY AGREEMENT

                                    BETWEEN

                         HUGHES NETWORK SYSTEMS, INC.

                                      AND

                           HUGHES LAN SYSTEMS, INC.
<PAGE>
 
                                  EXHIBIT 8.7

                        INTELLECTUAL PROPERTY AGREEMENT
                        -------------------------------


       This INTELLECTUAL PROPERTY AGREEMENT is made as of the ______ day of
________, 1995 ("Effective Date") by and between Hughes Network Systems, Inc., a
Delaware corporation ("HNS"), and Hughes LAN Systems, Inc. ("HLS") soon to be
known as Whittaker Communications, Inc.

                                   RECITALS
                                   --------

       WHEREAS, Hughes Aircraft Company ("Hughes") has agreed to sell HLS under
a Stock Purchase Agreement dated March __, 1995 ("Stock Purchase Agreement") to
Whittaker Corporation ("WC");

       WHEREAS, HNS and HLS have developed certain technology and intellectual
property related to asynchronous transfer mode ("ATM") cell based high speed
switching and related interfaces, some of which may have been incorporated into
products of HNS, its subsidiaries and affiliates, and HLS;

       WHEREAS, HLS has developed certain technology and intellectual property
related to network management software, which has been incorporated into
products of HNS;

       WHEREAS, HNS and HLS wish to obtain license rights from the other in said
technology and intellectual property for their respective products;

       WHEREAS, this agreement is entered into by the parties at the Closing
under the Stock Purchase Agreement;

       NOW, THEREFORE, for good and valuable consideration, the parties hereto
agree as follows:


DEFINITIONS
- -----------

1.1    ATMI Technology" means the technology and intellectual property developed
       ---------------        
       prior to the Effective Date relating to the ATM interface card and
       chipset used by HLS in its Enterprise Hub.
<PAGE>
 
LICENSES AND AGREEMENTS
- -----------------------

2.1    HNS and HLS hereby agree that the ATMI Technology is owned jointly by HNS
       and HLS as tenants in common with no obligation to report or account to
       the other party.

2.2    HLS hereby grants to HNS a non-exclusive, royalty-free, paid-up,
       worldwide license under HLS 20/20 DOS-based network management software
       to reproduce, adapt, modify and prepare derivative works and to make,
       have made, use and sell network hardware products incorporating object
       code versions of such reproductions, adaptations, modifications and
       derivations

2.3    In the event that HLS discovers an infringement of any HLS intellectual
       property by HNS, then HLS agrees to negotiate in good faith toward a
       license of the affected intellectual property

2.4    In the event that HNS discovers an infringement of any HNS intellectual
       property by HLS, then HNS agrees to negotiate in good faith toward a
       license of the affected intellectual property .

2.5    HLS shall reasonably cooperate with HNS in evaluation of HLS' 20/20 UNIX-
       based software in any and all versions to be developed and offer licenses
       to HNS to such 20/20 UNIX-based software including source code in any and
       all versions on reasonable terms and conditions at least as favorable as
       those under which licenses of such versions of HLS' 20/20 UNIX-based
       software are made available generally.

2.6    In the event that HLS abandons further licensing or further development
       of its 20/20 UNIX-based software, then, upon written request from HNS,
       HLS shall offer licenses to HNS to such 20/20 UNIX-based software as it
       exists at such time including source code in any and all versions on
       reasonable terms and conditions .
DISCLAIMERS
- -----------

3.1    HNS AND ITS SUBSIDIARIES AND AFFILIATES EXPRESSLY DISCLAIM ALL
       WARRANTIES, EXPRESS OR IMPLIED, IN CONNECTION WITH THE ATMI TECHNOLOGY
       AND THIS AGREEMENT, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES
       OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND AGAINST
       PATENT, COPYRIGHT, SEMICONDUCTOR MASK WORK OR TRADEMARK INFRINGEMENT.

3.2    HLS AND ITS SUBSIDIARIES AND AFFILIATES EXPRESSLY DISCLAIM ALL
       WARRANTIES, EXPRESS OR IMPLIED, IN CONNECTION WITH THE ATMI TECHNOLOGY,
       THE 20/20 DOS-BASED NETWORK MANAGEMENT

                                       3
<PAGE>
 
       SOFTWARE AND THIS AGREEMENT, INCLUDING BUT NOT LIMITED TO THE IMPLIED
       WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND
       AGAINST PATENT, COPYRIGHT, SEMICONDUCTOR MASK WORK OR TRADEMARK
       INFRINGEMENT.

3.3    HNS and its subsidiaries and affiliates shall have no liability arising
       directly or indirectly from the manufacture, use or sale of products by
       HLS.

3.4    HLS and its subsidiaries and affiliates shall have no liability arising
       directly or indirectly from the manufacture, use or sale of products by
       HNS.


GENERAL PROVISIONS
- ------------------

4.1    This agreement is deemed to be executed and delivered within the State of
       California and shall be construed, interpreted and applied in accordance
       with the laws of the State of California.

4.2    This agreement sets forth the entire agreement and understanding between
       the parties as to the subject matter of this agreement and merges and
       supersedes all prior discussions between them, and none of the parties
       shall be bound by any conditions, definitions, warranties or
       representations other than as expressly provided in this agreement or as
       duly set forth or subsequent to the date hereof in writing and signed by
       a proper and duly authorized officer of the party to be bound thereby.

4.3    This agreement inures to the benefit of and is binding upon subsidiaries
       and affiliates of the parties.

                                       4
<PAGE>
 
4.4    Neither party hereto may assign this Agreement without the prior written
       consent of the other party hereto. This Agreement shall be binding upon
       and inure to the benefit of the parties hereto and their respective
       successors and permitted assigns.

4.5    In the event that the parties cannot reasonably agree on the terms of any
       licenses to be negotiated under Section 2 hereof, then the dispute
       resolution procedures as set forth in Section 13.3 of the Stock Purchase
       Agreement, in their entirety, shall apply to determine the terms of such
       license, except that for this purpose, the arbitrators shall be persons
       who are technically qualified to evaluate the respective businesses and
       products involved for purposes of determining appropriate license terms.


       IN WITNESS WHEREOF, the parties have caused two (2) copies of this
agreement to be executed by their duly authorized officers as of the date first
specified above.


HUGHES NETWORK SYSTEMS, INC.                  HUGHES LAN SYSTEMS, INC.


By:_____________________________              By:_____________________________

Its:____________________________              Its:____________________________



APPROVED BY:
- ------------

WHITTAKER CORPORATION



By:_____________________________

Its:____________________________

                                       5


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