THIRD AMENDMENT TO CREDIT AGREEMENT                 EXHIBIT 10.17b

THIS THIRD AMENDMENT TO CREDIT AGREEMENT (this "Amendment") is entered into as 
of April 28, 1995, by and between TCI INTERNATIONAL, INC., a Delaware 
corporation ("TCI"), TECHNOLOGY FOR COMMUNICATIONS INTERNATIONAL, a California 
Corporation ("TCI International"), BR COMMUNICATIONS, a California corporation 
("BRC"), ("Borrower"), and WELLS FARGO BANK, NATIONAL ASSOCIATION ("Bank").

RECITALS

WHEREAS, Borrower is currently indebted to Bank pursuant to the terms and 
conditions of that certain Credit Agreement between Borrower and Bank dated as 
of May 17, 1994, as amended from time to time ("Credit Agreement").

WHEREAS, Bank and Borrower have agreed to certain changes in the terms and 
conditions set forth in the Credit Agreement and have agreed to amend the Credit
Agreement to reflect said changes.

NOW, THEREFORE, the Credit Agreement is hereby amended as follows:
1.  The second paragraph of Section 1.1(b) shall be deleted in its entirety, 
and the following substituted therefore:

Notwithstanding the foregoing, the outstanding principal balance of the Line, 
(including both contingent and liquidated liabilities) to a maximum of the 
principal sum stated above, shall not at any time ,exceed (a) ninety percent 
(90%) of the fair market value of marketable securities pledged to secure the 
Line with fair market value determined by Bank subject to the terms of the 
Addendum to General Pledge Agreement and Third Party Pledge Agreement from time 
to time in its sole discretion, plus (b) up to and including June 1, 1995, 
$1,000,000.00. Should, for any  reason whatsoever, the outstanding principal 
balance of the Line at any time exceed said amount, Borrowers  shall, 
immediately upon demand by Bank, pledge or cause  to be pledged with Bank 
additional marketable securities as security for the Letter of Credit Line,  
of a type and market value satisfactory to Bank.

2. Except as specifically provided herein, all terms and conditions of the 
Credit Agreement remain in full force and  effect, without waiver or 
modification. All terms defined in the Credit Agreement shall have the same 
meaning when used in this  Amendment. This Amendment and the Credit 
Agreement shall be read  together, as one document. 

3. Borrower hereby remakes all representations and  warranties contained in the 
Credit Agreement and reaffirms all  covenants set forth therein. Borrower 
further certifies that as  of the date of this Amendment there exists no Event 
of Default as defined in the Credit Agreement, nor any condition, 
act or event  which with the giving of notice or the passage of time or both 
would constitute any such Event of Default.

IN WITNESS WHEREOF, the parties hereto have caused this  Amendment to be 
executed as of the day and year first written above.

WELLS FARGO BANK, NATIONAL ASSOCIATION

By:  /s/ Sherrill Swan, Vice President


TCI INTERNATIONAL, INC.

By:  /s/ John W. Ballard, III, Vice President


TECHNOLOGY FOR COMMUNICATIONS INTERNATIONAL

By:  /s/ John W. Ballard, III, Vice President and General Manager


BR COMMUNICATIONS

By:  /s/ John W. Ballard, III, President





ADDENDUM TO GENERAL PLEDGE AGREEMENT AND THIRD PARTY PLEDGE 
AGREEMENT

THIS ADDENDUM is attached to and made a part of that  certain General Pledge 
Agreement and Third Party Pledge  ,Agreement (collectively, "Agreement") 
executed by TECHNOLOGY FOR COMMUNICATIONS INTERNATIONAL ("Debtor"), as of 
April 28, 1995,  in favor of WELLS FARGO BANK, NATIONAL ASSOCIATION ("Bank").

Debtor acknowledges and agrees as follows:

1. Collateral. Notwithstanding any reference in the  Agreement to a transfer, 
pledge or delivery to Bank, or a  deposit with Bank, of the Collateral and 
Proceeds defined in  paragraph 1 of the Agreement, and notwithstanding any 
reference  in the Agreement to the possession, custody or control by Bank  of 
the Collateral or Proceeds, said Collateral includes without limitation: 
(a) all securities (whether certificated or  uncertificated), bonds, documents, 
instruments, money, notes; repurchase agreements, general intangibles, and all 
other property of whatever nature or description, whether tangible or 
intangible, now or hereafter held on account of or for Debtor in Debtor's 
Overland Express Money Market Fund Account Number  2300422082 with Bank 
("Account"); (b) the Account itself and all replacements and substitutions 
therefore; and (c) Proceeds of all of the foregoing; provided however, that 
notwithstanding the generality of the foregoing, the term "Collateral" does 
not include any and Bank disclaims a security interest in all  Collective 
Investment Funds (as hereinafter defined) now or hereafter in the Account.

2.  Security Interest.  In accordance with and subject to the provisions of the 
Agreement, and to secure all indebtedness of Debtor, TCI International, Inc. or 
BR Communications, to Bank, Debtor grants and transfers to Bank a security 
interest in all of the Collateral described in the Agreement 
and paragraph 1 of this Addendum.

3.  Account Activity.  So long as no default exists with respect to the 
indebtedness secured hereby, Debtor may sell, exchange, transfer or otherwise 
dispose of assets in and withdraw assets from the Account and, provided however 
that the Collateral Value of the Account, as hereinafter defined, shall at all 
times be equal to or greater than one hundred percent (100%) of the outstanding 
principal balance (including both liquidated and contingent liabilities) of the 
Letter of Credit Line granted by Bank pursuant to Credit Agreement dated 
May 17, 1994, as amended from time to time.  In the event that the Collateral 
Value of the Account should, for any reason and at any time, be less than 
the required amount, Debtor shall promptly either make a principal reduction on 
the indebtedness secured hereby, or deposit additional assets, of a nature 
satisfactory to Bank, in either case, sufficient such that the Collateral Value 
of the Account achieves the required amount, and subject to the possibility 
of providing cash collateral as described in and pursuant to Section 1.1 of 
the Credit Agreement.

4.  Priority.  The terms of this Addendum override and take precedence over any 
provision to the contrary in any other agreement or other documentation relative
to the opening and maintenance of the Account.

5.  Defined Terms.  All terms defined in the Agreement and used herein shall 
have the same meaning when used in this Addendum.  Collective Investment Funds 
means a collective investment fund as described in 12 CFR 9.18 and includes 
without limitation a collective investment fund maintained by Bank's Trust 
Department.  Collateral Value of the Account means the sum of:  ninety 
percent (90%) of the market value of the Account, with market value, in all 
instances, determined by Bank in its sole discretion and excluding from such 
computation all WF Securities, Collective Investment Funds or any other assets 
in which Bank does not have a first priority perfected security 
interest now or hereafter in the Account, plus, up to and including 
June 1, 1995, $1,000,000.00.

IN WITNESS WHEREOF, the Debtor has executed this Addendum, which amends, 
replaces and supersedes the Addendum dated January 10, 1995.


TECHNOLOGY FOR COMMUNICATIONS INTERNATIONAL

By:  /s/ John W. Ballard, III, Vice President and General Manager