GABELLI FUNDS INC ET AL
SC 13D/A, 1998-09-22
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               SECURITIES AND EXCHANGE COMMISSION
                     Washington, D.C.  20549
                                
                                                
                          SCHEDULE 13D
                                                
   Under the Securities Exchange Act of 1934 (Amendment No. 1)
                                 
                           Mercom,Inc.         
                        (Name of Issuer)
                                
                        
                 Common Stock $1.00 Par Value    
                 (Title of Class of Securities) 
                                
                                                
                           58935D109                  
                         (CUSIP Number)
                                                
                                                
                                                
               James E. McKee, Gabelli Funds, Inc.,
     One Corporate Center, Rye, NY 10580-1434 (914) 921-5294
    (Name, Address and Telephone Number of Person Authorized
             to Receive Notices and Communications)
                                
                                                
                       September 17, 1998                     
     (Date of Event Which Requires Filing of this Statement)
                                

If the filing person has previously filed a statement on Schedule
13G to report the acquisition that is the subject of this Sched-
ule 13D, and is filing this schedule because of Sections 240.13d-1(e),
240.13d-1(f) or 240.13d-1(g), check the following box [  ].       
                                                                  
   
<PAGE>
________________________________________________________________

CUSIP No. 58935D109                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
      GAMCO Investors, Inc.              I.D. No. 13-2951242
_________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      OO-Funds of investment advisory clients
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          _____
                                                     /  x /
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      New York
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     194,535 (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None 
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     194,535 (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     194,535 (Item 5)
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         ____
                                                     /___/
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      4.07%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      IA, CO
_________________________________________________________________
              *SEE INSTRUCTIONS BEFORE FILLING OUT!   <PAGE>
_________________________________________________________________

CUSIP No. 58935D109                                      13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
      Gabelli Funds, Inc.            I.D. No. 13-3056041
_________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      OO-Funds of investment company clients
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          _____
                                                     /    /
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      New York
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     10,000 (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  (Item 5) 
 OWNED BY EACH REPORTING                :________________________
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     10,000 (Item 5)
                                        :________________________
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  (Item 5)  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     10,000 (Item 5)
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         _____
                                                     /  x /
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      0.21%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      HC, IA, CO
_________________________________________________________________
              *SEE INSTRUCTIONS BEFORE FILLING OUT!  <PAGE>
________________________________________________________________

CUSIP No. 723684106                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
      Gabelli Performance Partnership L.P.   I.D. No. 13-3396569
_________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
     WC     
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ____
                                                     /___/
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      New York 
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     82,000 (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     82,000 (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     82,000 (Item 5)
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         ____
                                                     /___/
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      1.71%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      PN
_________________________________________________________________

              *SEE INSTRUCTIONS BEFORE FILLING OUT!<PAGE>
_________________________________________________________________

CUSIP No. 58935D109                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
      Gabelli & Company, Inc.            I.D. No. 13-2885006
_________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      WC                    
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ______
                                                     /  X  /
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      New York
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     200   (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  (Item 5)
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     200   (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  (Item 5)
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      200  (Item 5)
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         ____
                                                     /___/
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      0.00%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      BD, CO
_________________________________________________________________
              *SEE INSTRUCTIONS BEFORE FILLING OUT!  <PAGE>
_________________________________________________________________

CUSIP No. 58935D109                                        13D
_________________________________________________________________ 
(1)  NAMES OF REPORTING PERSONS 
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
      Gabelli Associates Fund            I.D. No. 13-3246203
_________________________________________________________________ 
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      WC                                     
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ____
                                                     /___/
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      New York 
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     90,000 (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  
 OWNED BY EACH REPORTING                :________________________
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     90,000 (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      90,000 (Item 5)  
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         ____
                                                     /___/
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      1.88%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      PN
_________________________________________________________________

              *SEE INSTRUCTIONS BEFORE FILLING OUT!  <PAGE>
________________________________________________________________

CUSIP No. 58935D109                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
      Gabelli Associates Limited     I.D. No. Foreign Corporation
_________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      WC    
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ____
                                                     /___/
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      British Virgin Islands
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     60,000 (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     60,000 (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      60,000 (Item 5)  
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         ____
                                                     /___/
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      1.25%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      CO
_________________________________________________________________

              *SEE INSTRUCTIONS BEFORE FILLING OUT!  

_________________________________________________________________

CUSIP No. 58935D109                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
      Gabelli International Limited  I.D. No. Foreign Corporation
_________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      WC 
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ____
                                                     /___/
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      British Virgin Islands
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     51,000 (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     51,000 (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      51,000 (Item 5)
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         ____
                                                     /___/
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      1.07%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      CO
_________________________________________________________________

              *SEE INSTRUCTIONS BEFORE FILLING OUT!<PAGE>
_________________________________________________________________

CUSIP No. 58935D109                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
     Gabelli Advisers, Inc.          I.D. No. 13-4008049
_________________________________________________________________ 
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      00-Funds if investment compnay client
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ____
                                                     /    /
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
     Delaware
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     9,000  (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     9,000  (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      9,000  (Item 5)
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         _____
                                                     /    /
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      0.19%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
     IA, CO
_________________________________________________________________

              *SEE INSTRUCTIONS BEFORE FILLING OUT!<PAGE>
_________________________________________________________________

CUSIP No. 58935D109                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
      Gabelli International II Limited  I.D. No. Foreign         
                                                 Corporation
_________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      WC 
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ____
                                                     /___/
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      British Virgin Islands
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     23,000 (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     23,000 (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      23,000 (Item 5)
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         ____
                                                     /___/
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      0.48%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      CO
_________________________________________________________________

              *SEE INSTRUCTIONS BEFORE FILLING OUT!<PAGE>
________________________________________________________________

CUSIP No. 58935D109                                     13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
      Gabelli Fund, LDC         I.D. No. Foreign Corporation
_________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      WC 
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ____
                                                     /___/
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      British Virgin Islands
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     1,000 (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     1,000 (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      1,000 (Item 5)
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         ____
                                                     /___/
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      0.02%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      CO
_________________________________________________________________

              *SEE INSTRUCTIONS BEFORE FILLING OUT!<PAGE>
_________________________________________________________________

CUSIP No. 58935D109                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
     Marc J. Gabelli                  
________________________________________________________________ 
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      None
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ____
                                                     /    /
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      USA 
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     None   (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     None   (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     None   (Item 5)
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         _____
                                                     /  x /
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      0.00%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      IN
_________________________________________________________________

              *SEE INSTRUCTIONS BEFORE FILLING OUT!

_________________________________________________________________

CUSIP No. 58935D109                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
     Mario J. Gabelli                  
________________________________________________________________ 

(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      None 
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ____
                                                     /    /
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      USA 
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     None   (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  
 OWNED BY EACH REPORTING                :________________________ 
      PERSON WITH                       : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     None   (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     None   (Item 5)
_________________________________________________________________

(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         _____
                                                     /  x /
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      0.0%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      IN
_______________________________________________________________   
          *SEE INSTRUCTIONS BEFORE FILLING OUT!<PAGE>
Item 1.   Security and Issuer
          This Amendment No. 1 to Schedule 13D on Mercom, Inc.
(the "Issuer") is being filed on behalf of the undersigned to
amend the Schedule 13D, as amended (the "Schedule 13D") which was
originally filed on July 1, 1998.  Unless otherwise indicated,
all capitalized terms used herein but not defined herein shall
have the same meaning as set forth in the Schedule 13D.

Item 2.   Identity and Background
          This statement is being filed by Mario J. Gabelli ("Mario
Gabelli"), Marc J. Gabelli ("Marc Gabelli") and various entities which
either one directly or indirectly controls or for which either one
acts as chief investment officer.  These entities, except for Lynch
Corporation ("Lynch"), Spinnaker Industries, Incorporated
("Spinnaker"), Western New Mexico Telephone Company ("Western New
Mexico"), Entoleter, Inc. ("Entoleter"),  Lynch Telecommunications
Corporation ("Lynch Telecom"), Lynch Telephone Corporation ("Lynch
Telephone") and Inter-Community Telephone Company ("Inter-Community")
(collectively, "Lynch and its affiliates"), engage in various aspects
of the securities business, primarily as investment adviser to various
institutional and individual clients, including registered investment
companies and pension plans, as broker/dealer and as general partner
of various private investment partnerships.  Certain of these entities
may also make investments for their own accounts. 
          The foregoing persons in the aggregate often own
beneficially more than 5% of a class of equity securities of a
particular issuer.  Although several of the foregoing persons are
treated as institutional investors for purposes of reporting their
beneficial ownership on the short-form Schedule 13G, the holdings of
those who do not qualify as institutional investors may exceed the 1%
threshold presented for filing on Schedule 13G or implementation of
their investment philosophy may from time to time require action which
could be viewed as not completely passive.  In order to avoid any
question as to whether their beneficial ownership is being reported on
the proper form and in order to provide greater investment flexibility
and administrative uniformity, these persons have decided to file
their beneficial ownership reports on the more detailed Schedule 13D
form rather than on the short-form Schedule 13G and thereby to provide
more expansive disclosure than may be necessary. 
          (a), (b) and (c) - This statement is being filed by one or
more of the following persons: Gabelli Funds, Inc. ("GFI"), GAMCO
Investors, Inc. ("GAMCO"), Gabelli Securities, Inc. ("GSI"), Gabelli &
Company, Inc. ("Gabelli & Company"), Gabelli Performance Partnership
L.P. ("GPP"), GLI, Inc. ("GLI"), Gabelli Associates Fund ("Gabelli As-
sociates"), Gabelli Associates Limited ("GAL"), Gabelli & Company,
Inc. Profit Sharing Plan (the "Plan"), Gabelli International Limited
("GIL"), Gabelli International II Limited ("GIL II"), Gabelli
International Gold Fund Limited ("GIGFL"), ALCE Partners, L.P.
("ALCE"), Gabelli Multimedia Partners, L.P. ("Multimedia Partners"),
MJG Associates, Inc. ("MJG Assocciates"), 
Gemini Capital Management Ltd. ("Gemini"), Gabelli Fund, LDC ("LDC"),
Gabelli Foundation, Inc. ("Foundation"), Mario Gabelli, Marc Gabelli,
Lynch, Spinnaker, Western New Mexico, Entoleter, Lynch Telecom, Lynch
Telephone and Inter-Community. Those of the foregoing persons signing
this Schedule 13D are hereafter referred to as the "Reporting Per-
sons".    
          GAMCO, a wholly-owned subsidiary of GFI, is an investment
adviser registered under the Investment Advisers Act of 1940, as
amended ("Advisers Act").  GAMCO is an investment manager providing
discretionary managed account services for employee benefit plans,
private investors, endowments, foundations and others. 
          Gabelli & Company, a wholly-owned subsidiary of GSI, is a
broker-dealer registered under the Securities Exchange Act of 1934, as
amended ("l934 Act"), which as a part of its business regularly
purchases and sells securities for its own account.  
          GLI, wholly-owned subsidiary of GSI, is a corporation which
currently has no active operations. 
          Gabelli Associates is a New York limited partnership whose
primary business purpose is risk arbitrage investments.  GSI and Mario
Gabelli are the general partners of Gabelli Associates. 
          GAL is a corporation whose primary business purpose is risk
arbitrage investments.  Shares of GAL's common stock are offered to
persons who are neither citizens nor residents of the United States
and may be offered to a limited number of U.S. investors.  GSI is the
investment manager of GAL.
          GSI, a majority-owned subsidiary of GFI, is a Delaware
corporation which as a part of its business regularly purchases and
sells securities for its own account.  It is the immediate parent of
Gabelli & Company.  
          GFI is the ultimate parent company for a variety of
companies engaged in the securities business, each of which is named
above.  In addition, GFI is an investment adviser registered under the
Advisers Act.  GFI is an investment adviser which presently provides
discretionary advisory services to The Gabelli Equity Trust Inc., The
Gabelli Asset Fund, The Gabelli Growth Fund, The Gabelli Convertible
Securities Fund, Inc., The Gabelli Value Fund Inc., The Gabelli Small
Cap Growth Fund, The Gabelli Equity Income Fund, The Gabelli ABC Fund,
The Gabelli Global Telecommunications Fund, Gabelli Gold Fund, Inc.,
The Gabelli Global Multimedia Trust Inc., The Gabelli Global
Convertible Securities Fund, Gabelli Capital Asset Fund, Gabelli
International Growth Fund, Inc. and The Gabelli Global Interactive
Couch Potato Fund (collectively, the "Funds"), which are registered
investment companies.
          Gabelli Advisers, Inc. ("Gabelli Advisers"), a Delaware
corporation, is an investment adviser which provides discretionary
advisory services to The Gabelli Westwood Mighty Mitessm Fund.
          The Plan, a qualified employee profit sharing plan, covers
substantially all employees of GFI and its affiliates. 
          GPP, a New York limited partnership, is a limited
partnership whose primary business purpose is investing in securities. 
MJG Associates is the general partner of GPP, and Mario Gabelli is a
portfolio manager for GPP.  
          GIL is a corporation whose primary business purpose is
investing in a portfolio of equity securities and securities
convertible into, or exchangeable for, equity securities in order to
achieve its investment objective of significant long-term growth of
capital.  Shares of GIL's common stock are offered to persons who are
neither citizens nor residents of the United States and may be offered
to a limited number of U.S. investors.  MJG Associates is the
Investment Manager of GIL.  Mario Gabelli is a portfolio manager for
GIL and Chairman of the Board of Directors of GIL.
          GIL II is a corporation whose business purpose is investing
primarily in a portfolio of equity securities and securities
convertible into, or exchangeable for, equity securities in order to
achieve its investment objective of significant long-term growth of
capital.  Shares of GIL II's common stock are offered to persons who
are neither citizens nor residents of the United States and may be
offered to a limited number of U.S. investors.   MJG Associates is the
Investment Manager of GIL II. 
Mario Gabelli is a director and Chairman of the Board of Directors of
GIL II. Marc Gabelli is a portfolio manager for GIL II.  
       ALCE is a Delaware investment limited partnership that seeks
long-term capital appreciation primarily through investments in public
and private equity securities.  GSI is a general partner of ALCE.
       Multimedia Partners is a Delaware investment limited
partnership whose objective is to provide long-term capital
appreciation by investing primarily in public and private multimedia
communications companies.  GSI is a general partner of Multimedia
Partners.
       LDC is a corporation whose business purpose is investing
primarily in a portfolio of equity securities and securities
convertible into, or exchangeable for, equity securities in order to
achieve its investment objective of significant long-term growth of
capital.  Interests are offered to insurance companies which do not
conduct any business in the United States and which are licensed where
they do business.  MJG Associates is the Investment Manager of LDC. 
Marc Gabelli is a portfolio manager for LDC.  
       MJG Associates, a Connecticut corporation, provides advisory
services to private investment partnerships and offshore funds.  Mario 
Gabelli is the sole shareholder, director and employee of MJG
Associates.
       Gemini is a corporation whose primary business purpose is to
provide advisory services to offshore funds.  Marc Gabelli is the
President and Chief Investment Officer of Gemini.
       The Foundation is a private foundation. Mario Gabelli is the
President, a Trustee and the Investment Manager of the Foundation.
       Lynch, an Indiana corporation, is a diversified public company
traded on the American Stock Exchange.  Its subsidiaries are engaged
in communications, services, and manufactured products.  Spinnaker, a
Delaware subsidiary of Lynch, is also a public company and its stock
is traded through the NASDAQ System.  Spinnaker is a diversified
manufacturing firm with major subsidiaries in specialty adhesive-
backed materials business.  Another of Lynch's subsidiaries, Western
New Mexico, provides telephone services in a service area in
Southwestern New Mexico.  Inter-Community, which is also a subsidiary
of Lynch, provides local telephone services in an area 40 miles west
of Fargo, North Dakota.   Lynch and Spinnaker actively pursue new
business ventures and acquisitions.  Lynch and its affiliates make
investments in marketable securities to preserve capital and maintain
liquidity for financing their business activities and acquisitions
(not in the case of Western New Mexico) and are not engaged in the
business of investing, reinvesting, or trading in securities.  Mario
Gabelli is Chairman of Lynch and beneficially owns approximately 23%
of the shares of common stock of Lynch. 
          Mario Gabelli is the majority stockholder and Chairman of
the Board of Directors and Chief Executive Officer of GFI and the
Chief Investment Officer for each of the Reporting Persons other than
Gemini, LDC and GIL II.  GFI, in turn, is the sole stockholder of
GAMCO.  GFI is also the majority stockholder of GSI and the largest
shareholders of Gabelli Advisers.  Gabelli & Company is a wholly-owned
subsidiary of GSI.  GLI is a wholly-owned subsidiary of GSI.  Marc
Gabelli is the majority stockholder of Gemini.
          The Reporting Persons do not admit that they constitute a
group. 
          GFI, GAMCO, Gabelli & Company and GLI are New York
corporations and GSI and Gabelli Advisers are Delaware corporations,
each having its principal business office at One Corporate Center,
Rye, New York 10580-1434.  GPP is a New York limited partnership
having its principal business office at 401 Theodore Fremd Ane., Rye,
New York 10580.  Gabelli Associates is a New York limited partnership
having its principal business office at One Corporate Center, Rye, New
York 10580-1434. GAL and GIL are corporations organized under the laws
of the British Virgin Islands having their principal business office
at c/o MeesPierson (Cayman) Limited, British American Centre, Dr.
Roy's Drive-Phase 3, George Town, Grand Cayman, British West Indies. 
GIL II is a corporation organized under the laws of the British Virgin
Islands having their principal business office at c/o Coutts & Company
(Cayman) Limited, West Bay Road, Grand Cayman, British West Indies. 
Gemini is a Bermuda corporation with its principal business office at
c/o Appleby, Spurling & Kempe, Cedar House, 41 Cedar Avenue, Hamilton
HM12, Bermuda.  LDC is a corporation organized under the laws of the
British Virgin Islands having its pricipal business office at c/o
Tremont (Bermuda) Limited, Tremont House, 4 Park Road, Hamilton HM II,
Bermuda. The Foundation is a private foundation having its principal
offices at 165 West Liberty Street, Reno, Nevada 89501. Lynch is an
Indiana corporation having its principal business office at 401
Theodore Fremd Avenue, Rye, NY 10580.  Spinnaker is a Delaware
corporation having its principal business office at 251 Welton Street,
Hamden, CT 06511. 
          For information required by instruction C to Schedule 13D
with respect to the executive officers and directors of the foregoing
entities and other related persons (collectively, "Covered Persons"),
reference is made to Schedule I annexed hereto and incorporated herein
by reference. 
          (d) and (e) -  On December 8, 1994, the SEC instituted and
simultaneously accepted offers for the settlement of an administrative
proceeding against Gabelli & Company and GAMCO.  The order instituting
the proceeding included a finding, which Gabelli & Company and GAMCO
neither admitted nor denied, that they failed to implement and
maintain policies and procedures reasonably designed to prevent the
misuse of material, nonpublic information by not specifically
addressing the special circumstances that arose from their affiliation
with Lynch Corporation, a public company.  To resolve this matter,
Gabelli & Company and GAMCO agreed to cease and desist from violating
Section 15(f) of the 1934 Act and Section 204A of the Advisers Act,
respectively.  They further agreed to each pay a civil penalty in the
amount of $50,000, and to retain, and adopt the recommendations of, an
independant consultant regarding their Section 15(f) and Section 204A
policies and procedures.  
     (f) - Reference is made to Schedule I hereto.  

Item 3.   Source and Amount of Funds or Other Consideration
          Item 3 to Schedule 13D is amended, in pertinent part, as
follows:
          All Reporting Persons used an aggregate of approximately
$538,020 to purchase the Securities reported as beneficially owned in
Item 5 below since the most recent filing on Schedule 13D.  GAMCO, GFI
and Gabelli Advisers used approximately $38,544, $57,700 and $57,700,
respectively, of funds that were provided through the accounts of
certain of their investment advisory clients (and, in the case of some
of such accounts at GAMCO, may be through borrowings from client
margin accounts) in order to purchase the additional Securities for
such clients.  Gabelli Associates used approximately $257,827 of the
investment funds of the partnership to purchase the additional
Securities reported by it.  GAL used approximately $115,000, of
working capital to purchase the additional Securities reported by it.
Gabelli & Company used approximately $1,964 of working capital to
purchase the additional Securities reported by it. LDC used
approximately $11,250, of working capital to purchase the additional
Securities reported by it.

Item 5.   Interest In Securities Of The Issuer
          Item 5 to Schedule 13D is amended, in pertinent part, as
follows:
          (a)  The aggregate number and percentage of Securities to
which this Schedule 13D relates is 520,735 shares, representing 10.88%
of the 4,787,060 shares outstanding as reported in the Issuer's most
recently filed Form 10-Q for the quarter ended June 30, 1998. The
Reporting Persons beneficially own those Securities as follows:
                              Shares of           % of
                              Common              Class of
Name                          Stock               Common Stock  

GFI:
  As Principal                       0                0.00%
  As Agent                      10,000                0.21%

GAMCO:                                                 
  As Principal                       0                0.00%
  As Agent                     194,535                4.07%

Gabelli & Company                  200                0.00%

GPP                             82,000                1.71%

Gabelli Associates              90,000                1.88%

GAL                             60,000                1.25%

GIL                             51,000                1.07%

GIL II                          23,000                0.48%

Gabelli Advisers                 9,000                0.19%

Gabelli Fund, LDC                1,000                0.02%

Marc Gabelli                         0                0.00%
                                                       
Mario Gabelli                        0                0.00%


          Mario Gabelli is deemed to have beneficial ownership of the
Securities owned beneficially by each of the foregoing persons other
than Marc Gabelli.  Marc Gabelli is deemed to have beneficial owner-
ship of the Securities beneficially owned by GIL II and LDC.  GFI is
deemed to have beneficial ownership of the Securities beneficially
owned by each of the foregoing persons other than Mario Gabelli and
Marc Gabelli.
          (b) Each of the Reporting Persons and Covered Persons has the
sole power to vote or direct the vote and sole power to dispose or to
direct the disposition of the Securities reported for it, either for its
own benefit or for the benefit of its investment clients or its
partners, as the case may be, except that GFI has sole dispositive and
voting power with respect to the shares of the Issuer held by the Funds
so long as the aggregate voting interest of all joint filers does not
exceed 25% of their total voting interest in the Issuer and, in that
event, the Proxy Voting Committee of each Fund shall respectively vote
that Fund's shares, at any time, the Proxy Voting Committee of each such
Fund may take and exercise in its sole discretion the entire voting
power with respect to the shares held by such fund under special
circumstances such as regulatory considerations, and the power of Mr.
Gabelli and GFI is indirect with respect to Securities beneficially
owned directly by other Reporting Persons. 
          (c) Information with respect to all transactions in the
Securities which were effected during the past sixty days or since the
most recent filing on Schedule 13D, whichever is less, by each of the
Reporting Persons and Covered Persons is set forth on Schedule II
annexed hereto and incorporated herein by reference.
          (e)  Not applicable.  

<PAGE>
Signature
          After reasonable inquiry and to the best of my knowledge and
belief, I certify that the information set forth in this statement is
true, complete and correct. 
Dated:    September 22, 1998
                                   MARIO J. GABELLI




                                  By: ____________________________
                                      James E. McKee
                                      Attorney-in-Fact

 
                                   GABELLI FUNDS, INC.  
                                   


                                   By:_________________________
                                      James E. McKee
                                      General Counsel


                                   GAMCO INVESTORS, INC.  
                                   

                                   By:_________________________
                                      James E. McKee                   
                                      General Counsel



                                   GABELLI PERFORMANCE 
                                   PARTNERSHIP, L.P.




                                   By:_______________________
                                      MJG Associates, Inc.,
                                      General Partner
                                      by: Mario J. Gabelli
                                          President
                                      by: James E. McKee
                                          Attorney-in-Fact 
                                      







                                   GABELLI & COMPANY, INC.




                                   By:________________________
                                      James E. McKee
                                      Secretary

                                   GABELLI ASSOCIATES FUND



                                   By:________________________
                                      Gabelli Securities, Inc.,
                                      General Partner
                                      by: James E. McKee
                                          Secretary

                                   GABELLI ASSOCIATES LIMITED


                                   
                                   By:________________________
                                      Gabelli Securities, Inc.,
                                      Investment Manager
                                      by: James E. McKee
                                          Secretary

                                   GABELLI INTERNATIONAL LIMITED



                                   By:__________________________
                                      Mario J. Gabelli, Chairman
                                      by: James E. McKee
                                          Attorney-in-Fact

                                   GABELLI INTERNATIONAL II LIMITED



                                   By:__________________________
                                      Mario J. Gabelli, Chairman
                                      by: James E. McKee
                                          Attorney-in-Fact


                                   GABELLI ADVISERS, INC.



                                   By:_________________________
                                      James E. McKee
                                      Secretary




                                   MARC J. GABELLI




                                   By:_________________________
                                      James E. McKee
                                      Attorney-in-Fact


                                   GABELLI FUND, LDC




                                   By:_________________________
                                      James E. McKee
                                      Attorney-in-Fact<PAGE>
Schedule I


              Information with Respect to Executive
            Officers and Directors of the Undersigned 

          Schedule I to Schedule 13D is amended, in pertinent part, as
follows:
          The following sets forth as to each of the executive officers
and directors of the undersigned: his name; his business address; and
his present principal occupation or employment and the name, principal
business and address of any corporation or other organization in which
such employment is conducted.  Unless otherwise specified, the principal
employer of each such individual is Gabelli Funds, Inc., Gabelli &
Company, Inc., or GAMCO Investors, Inc., the business address of each of
which is One Corporate Center, Rye, New York 10580, and each such
individual identified below is a citizen of the United States.  To the
knowledge of the undersigned, during the last five years, no such person
has been convicted in a criminal proceeding (excluding traffic
violations or similar misdemeanors), and no such person was a party to
a civil proceeding of a judicial or administrative body of competent
jurisdiction as a result of which he was or is subject to a judgment,
decree or final order enjoining future violations of, or prohibiting or
mandating activities subject to, federal or state securities law or
finding any violation with respect to such laws except as reported in
Item 2(d) of this Schedule 13D. 

<PAGE>
Gabelli Funds, Inc. 

Directors: 

     Mario J. Gabelli*

     Richard B. Black              Chairman ECRM; Director of 
                                   Oak Technology, Inc.; Director
                                   of The Morgan Group, Inc.;
                                   General Partner of KBA Part-  
                                   ners, Parker Plaza
                                   400 Kelby Street,
                                   Fort Lee, NJ 07029

     Charles C. Baum               Chairman, Director and Chief
                                   Executive Officer of The Morgan
                                   Group, Inc.; Secretary & Treasurer
                                   United Holdings              
                                   2545 Wilkens Avenue
                                   Baltimore, MD  21223

     Dr. Eamon M. Kelly            President
                                   Tulane University
                                   218 Gibson Hall
                                   6823 St. Charles Avenue
                                   New Orleans, LA  70118

     Marc J. Gabelli               Managing Director

     Matthew R. Gabelli            Vice President-Trading             
                                   Gabelli & Company
                                   One Corporate Center
                                   Rye, New York 10580
Officers:

     Mario J. Gabelli              Chairman, Chief Executive
                                   Officer and Chief Investment
                                   Officer

     
     Stephen G. Bondi              Executive Vice President-Finance
                                   and Adminstration

     Robert S. Zuccaro             Chief Financial Officer
                         
     James E. McKee                Vice President, General 
                                   Counsel and Secretary
_____________________

     *    Mr. Gabelli is the Chief Executive Officer and Chief
Investment Officer of Gabelli Funds, Inc. and of GAMCO Investors, Inc.;
Director/Trustee of all registered investment companies advised by
Gabelli Funds, Inc.; Chairman and Chief Executive Officer of Lynch
Corporation; Director of East/West Communications, Inc. <PAGE>
GAMCO Investors, Inc.

Directors:
     
     Mario J. Gabelli
     Douglas R. Jamieson
     Joseph R. Rindler, Jr.
     Regina M. Pitaro
     F. William Scholz, II

Officers:
     
     Mario J. Gabelli              Chief Executive Officer 
                                   and Chief Investment Officer

     Joseph R. Rindler, Jr.        Chairman

     Douglas R. Jamieson           Executive Vice President 

     Stephen G. Bondi              Vice President

     James E. McKee                Vice President, General Counsel
                                   and Secretary

Gabelli Advisers, Inc.

Directors:
     
     Bruce N. Alpert
     John D. Gabelli
     Joseph R. Rindler, Jr.

Officers:

     Bruce N. Alpert               Chief Operating Officer

     Stephen G. Bondi              Vice President

     James E. Mckee                Secretary


Gabelli Securities, Inc.

Directors:

     Robert W. Blake               President of W.R. Blake
                                   & Sons, Inc.
                                   196-20 Northern Boulevard
                                   Flushing, NY  11358

     Douglas G. DeVivo             General Partner of ALCE
                                   Partners, L.P.
                                   One First Street, Suite 16
                                   Los Altos, CA  94022


     Joseph R. Rindler, Jr.        See above


Officers:
     

     Stephen G. Bondi              Vice President

     James E. McKee                Secretary




Gabelli & Company, Inc.

Directors:

     James G. Webster, III         Chairman 
     
     Stephen G. Bondi              See above

     Donald C. Jenkins             Director of Research

Officers:

     James G. Webster, III         Chairman 

     Stephen G. Bondi              Vice President 

     Bruce N. Alpert               Vice President-Mutual Funds

     Walter K. Walsh               Compliance Officer

     James E. McKee                Secretary


GLI, Inc.
Directors:

     Mario J. Gabelli              See above-Gabelli Funds, Inc.


Officers:

     Mario J. Gabelli              Chairman and Chief Investment
                                   Officer

     Stephen G. Bondi              Vice President


Gabelli Associates Limited

Directors:

     Mario J. Gabelli              See above-Gabelli Funds, Inc.
     
     MeesPierson  (Cayman)         British American Centre   
     Limited                       Dr. Roy's Drive- Phase 3
                                   Georgetown, Grand Cayman   
                                   Cayman Islands, British             
                                   WestIndies

Officers:

     Mario J. Gabelli              Chief Investment Officer

     Kevin Bromley                 Vice President, Treasurer and
                                   Assistant Secretary

     Sandra Wight                  Secretary and Assistant Treasurer



Gabelli International Limited

Directors:

     Mario J. Gabelli              See above-Gabelli Funds, Inc.
   
     MeesPierson  (Cayman)         British American Centre   
     Limited                       Dr. Roy's Drive- Phase 3
                                   Georgetown, Grand Cayman   
                                   Cayman Islands, British West Indies

Officers:

     Kevin Bromley                 Vice President, Treasurer, and 
                                   Assistant Secretary 
                                   MeesPierson (Cayman) Limited
                                   British American Centre  
                                   Dr. Roy's Drive- Phase 3   
                                   Georgetown, Grand Cayman    
                                   Cayman Islands, British West Indies

     Sandra Wight                  Secretary and Assistant Treasurer
                                   Assistant Secretary
                                   MeesPierson (Cayman) Limited
                                   British American Centre  
                                   Dr. Roy's Drive- Phase 3   
                                   Georgetown, Grand Cayman    
                                   Cayman Islands, British West Indies



Gemini Capitial Management Ltd.

Directors:

     Marc J. Gabelli               See above-Gabelli Funds, Inc.

     Stephen G. Bondi              See Above-Gabelli Funds, Inc.

     Michael A. Salatto            Controller, Gabelli Securities, Inc.

     Michael J. Burns              Appleby, Spurling & Kempe
                                   Cedar House
                                   41 Cedar Avenue
                                   Hamilton, HM12
                                   Bermuda             


     Douglas Molyneux              Appleby, Spurling & Kempe
                                   Cedar House
                                   41 Cedar Avenue
                                   Hamilton, HM12
                                   Bermuda        



Gabelli Fund, LDC

Directors:

     Johann S. Wong                c/o Tremont (Bermuda)
                                   Limited
                                   Tremont House
                                   4 Park Road
                                   Hamilton HM 11, Bermuda

     Peter D. Anderson             Givens Hall Bank & Trust
                                   Genesis Building
                                   P.O. Box 2097
                                   Grand Cayman, Cayman Islands
                                   BWI3459498141

     Karl Otto Pohl                Sal Oppenheim Jr. & Cie
                                   Bockenheimer Landstrasse 20
                                   D-6000 FRANKFURT AM MAIN
                                   Germany

     Anthonie C. van Ekris         See below


Lynch Corporation
401 Theodore Fremd Avenue
Rye, NY  10580

Directors:

     Paul J. Evanson               President               
                                   Florida Light & Power Co.
                                   P.O Box 14000
                                   700 Universe Blvd.
                                   Juno Beach, Fl 33408

     Mario J. Gabelli              See above-Gabelli Funds, Inc.


     E. Val Cerutti                Business Consultant          
                                   Cerutti Consultants 
                                   227 McLain Street
                                   Mount Kisco, NY   10540


     Ralph R. Papitto              Chairman of the Board
                                   AFC Cable Systems, Inc.
                                   50 Kennedy Plaza
                                   Suite 1250
                                   Providence, RI  02903

     Salvatore Muoio               Principal
                                   S. Muoio & Co., LLC
                                   655 Third Avenue
                                   New York, NY 10017       


     John C. Ferrara               Chief Financial Officer
                                   Golden Books Family Entertainment
                                   888 Seventh Avenue  
                                   New York, NY 10106


     David C. Mitchell             Business Consultant
                                   c/o Lynch Corporation
                                   401 Theodore Fremd Ave
                                   Rye, NY 10580


Officers:

     Mario J. Gabelli              Chairman and Chief Executive Officer

     Robert E. Dolan               Chief Financial Officer 

     Carmine Ceraolo               Assistant Controller

     Robert A. Hurwich             Vice President-Administration,
                                   Secretary and General Counsel

Spinnaker Industries, Inc.
600 N. Pearl Street 
Suite 2160
Dallas, TX  75201

Directors:

     Joseph P. Rhein               5003 Central Avenue     
                                   Ocean City, NJ  08226
                                   
     Richard J. Boyle              The Boyle Group, Inc.             
                                   6110 Blue Circle Drive
                                   Suite 250           
                                   Minnetonka, MN  55343

     Ned N. Fleming, III           Boyle, Fleming, 
                                   & Co., Inc.              
                                   600 N. Pearl Street
                                   Suite 2160
                                   Dallas, TX  75201


     Robert E. Dolan               See above Lynch Corporation






     Anthonie C. van Ekris         Chairman and Chief 
                                   Executive Officer
                                   Balmac International, Inc.
                                   61 Broadway
                                   Suite 1900
                                   New York, NY  10006


     Frank E. Grzelecki            President
                                   Saugatuck
                                   1 Canterbury Green
                                   Stamford, CT 06901




     Philip W. Colburn             Chairman of the Board
                                   Allen Telecom, Inc.
                                   11611 San Vincente Blvd.
                                   Suite 505
                                   Los Angeles, CA 90049
Officers:

     Ned N. Fleming, III           President

     Richard J. Boyle              Chairman and Chief Executive Officer

     Robert A. Hurwich             Secretary

     Mark A. Matteson              Vice President, Corporate
                                   Development

     Craig Jennings                Controller


Entoleter, Inc.
251 Welton Street
Hamden, CT  06517

Directors:

     Ned N. Fleming, III           See above-Spinnaker

     Mark A. Matteson              See above-Spinnaker

     Robert Hladick                See above Entoleter   

     Robert P. Wentzel             See above Entoleter


     James Fleming                 230 Saugatuck Avenue, Unit 8
                                   Westport, CT  06880

Officers:

     Robert P. Wentzel             President


     Mark R. Matteson              Vice President

     Robert Hladick                Controller & Secretary


Western New Mexico Telephone Company
314 Yankee Street
Silver City, NM  88062

Directors:

     Jack C. Keen                  Chairman and President

     Dr. Brian E. Gordon           Vice President

     Mary Beth Baxter              Secretary & Treasurer



     John Clay Keen                Route 6
                                   Box 270
                                   Greenville, TX 75401

     Robert E. Dolan               See above-Lynch Corporation

     Robert A. Hurwich             See above-Lynch Corporation

     Carmine Ceraolo               See above-Lynch Corporation

     Mary J. Carroll               See above-Lynch Corporation

     Eugene P. Connell             See above-Lynch Corporation

Officers:

     Jack C. Keen                  Chairman and President

     Jack L. Bentley               Executive Vice President

     Dr. Brian E. Gordon           Vice President

     Charles M. Baxter             Sr. Vice President-Operations
     
     Mary Beth Baxter              Secretary & Treasurer

     Robert A. Hurwich             Assistant Treasurer


Inter-Community Telephone Company
P.O. Box A
Nome, ND  58062

Directors:

     Mary J. Carroll               See above-Lynch Corporation

     Robert E. Dolan               See above-Lynch Corporation

     Joseph H. Epel                See above-Lynch Corporation

     Robert A. Hurwich             See above-Lynch Corporation

     Eugene P. Connell             See above-Lynch Corporation

     Harry B. Snyder               P.O. Box 131
                                   Buffalo, ND  58011
                                   
     Robert Snyder                 200 Broadway South
                                   Buffalo, ND  58011

     Keith S. Anderson             See above-Inter-Community Telephone
                                   Company

     Robert Reff                   See above-Inter-Community Telephone
                                   Company

Officers:

     Leone A. Nilsen               President
     
     Robert Snyder                 President 

     Robert  Reff                  Vice President
     
     Keith S. Anderson             Secretary
     
     Harry B. Snyder               Treasurer

     Joseph H. Epel                Assistant Treasurer

     Robert A. Hurwich             Assistant Secretary


Lynch Telecommunications Corporation
401 Theodore Fremd Avenue
Rye, NY 10580

Directors:

     Richard A. Kiesling           2801 International Lane
                                   Suite 207
                                   Madison, WI  53740           

     Robert E. Dolan               See above-Lynch Corporation



     Robert A. Snyder              See above-Inter-Community
                                   Telephone Company

     Eugene P. Connell             See above-Lynch Corporation

Officers:

     Robert A. Hurwich             Secretary

     Joseph H. Epel                Treasurer and 
                                   Assistant Secretary

     Robert E. Dolan               President, Controller, Assistant
                                   Treasurer, and Assistant Secretary


Lynch Telephone Corporation
401 Theodore Fremd Avenue
Rye, NY 10580  

Directors:

     Robert E. Dolan               Controller

     Jack W. Keen                  President

     Robert A. Hurwich             See above-Lynch Corporation

     Eugene P. Connell             See above-Lynch Corporation



Officers:

     Jack C. Keen                  Chairman

     Jack W. Keen                  President

     Robert A. Hurwich             Secretary

     Mary Beth Baxter              Treasurer and 
                                   Assistant Secretary

     Robert E. Dolan               Controller

SCHEDULE II
INFORMATION WITH RESPECT TO
TRANSACTIONS EFFECTED DURING THE PAST SIXTY DAYS OR
SINCE THE MOST RECENT FILING ON SCHEDULE 13D (1)

                                             SHARES PURCHASED        AVERAGE    
                                  DATE            SOLD(-)             PRICE(2)  
                                                                                
COMMON STOCK-MERCOM INC                                              
                                                                                
          GABELLI FUNDS, INC.                                                   
               THE GABELLI GLOBAL MULTI MEDIA TRUST                             
                                 8/18/98            5,000            11.5400    
          GAMCO INVESTORS, INC.                                                 
                                 9/15/98            3,000            11.1458    
                                 7/29/98              475            10.7500    
          GABELLI ASSOCIATES LTD                                                
                                 8/13/98            1,000-           11.5000    
                                 8/13/98           11,000            11.5000    
          GABELLI FUND, LDC                                                
                                 9/02/98            1,000            11.2500    
          GABELLI ASSOCIATES FUND                                               
                                 9/15/98            1,300            11.1250    
                                 8/12/98            4,700            11.7128    
                                 8/05/98            2,500            10.7500    
                                 7/16/98           15,000            10.7500    
          GABELLI ADVISERS, INC.                                               
                                 8/18/98            5,000            11.5400    
          GABELLI & COMPANY MARKET MAKING ACCOUNT                               
                                 9/17/98              200            11.1250    
                                 8/28/98              179-           11.3750    
                                                                                
                                                                                
(1) UNLESS OTHERWISE INDICATED, ALL TRANSACTIONS WERE EFFECTED        
    ON THE NY STOCK EXCHANGE.                                         
                                                                      
(2) PRICE EXCLUDES COMMISSION.                                        
                                                                      
(*) RESULTS IN CHANGE OF DISPOSITIVE POWER AND BENEFICIAL OWNERSHIP.  


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