I have the same problem when using HAMCOMM for RTTY with my Kenwood
TS-850. I solved it by isolating the audio circuits with a transformer
and the digital circuits with an optocoupler. I have a similar problem
when I connect my computer with TRLog to the CW key jack, so I built an
optocoupler interface for it and the problem went away.
When I went to the Kenwood site to research this problem, their first
recommended fix was to power the radio and the TNC/Computer from
DIFFERENT power supplies. I'm not sure why the common ground causes a
problem, but isolating it fixes the symptoms!
73 de KU0KU, Jack, Kansas City
<jack.sippel@nellcorpb.com>
______________________________ Reply Separator _________________________________
Subject: [RFI] Accessory port RFI
Author: <kboswell@aetn.org (Kelly Boswell) > at NPB-INTERNET-MAIL
To: <rfi@contesting.com>
Date: 3/26/98 10:53
Was pleased to see an "Accessory" port on the back on my Icom 737. It works
well with my TNC for packet, rtty, etc. Unfortunately, the microphone audio
is distorted (quite badly, I'm told) when a cable remains connected to this
port. I've tried the Radio Shack chokes which separate in to two C-shaped
sections. No luck. Audio is still so bad I just unplug the cable. Any
suggestions?
Kelly Boswell
KA5MGL
kboswell@aetn.org
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