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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!whuxl!whuxlm!akgua!akguc!mtunh!ky2d-2!ka2ugq
From: ka2ugq@ky2d-2.UUCP (Tom)
Newsgroups: net.ham-radio,net.ham-radio.packet
Subject: Correction to Icom HT to TNC schematic
Message-ID: <118@ky2d-2.UUCP>
Date: Sun, 26-Jan-86 14:08:20 EST
Article-I.D.: ky2d-2.118
Posted: Sun Jan 26 14:08:20 1986
Date-Received: Tue, 28-Jan-86 06:29:55 EST
Distribution: net
Organization: KY2D-2 Packet Radio Gateway, Little Silver, NJ
Lines: 31
Xref: watmath net.ham-radio:3790 net.ham-radio.packet:215

I made a big mistake in the previously-posted schematic of
the connection between an Icom IC-2A, 2AT, or 02AT and a
packet radio TNC, RTTY afsk unit, or another microphone.
The resistor and capacitor were backwards.  The correct
schematic follows:

                         Audio
                       from TNC*        PTT     Ground
                           |             |         |
                          ---            /         |
                     (C1) ---       (R1) \         |
                           |             /         |
                           |             |         |
          Icom HT          |             |         |
            mic input------+-------------+         |
                                                   |
             ground--------------------------------+

C1 - 0.47 uf capacitor
R1 - 25K resistor

* TNC or RTTY afsk or another microphone or whatever you are
  interfacing to your Icom HT.

-Tom KA2UGQ

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