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From: rjr@mgweed.UUCP
Newsgroups: net.ham-radio
Subject: RF in audio ckt problem with 830
Message-ID: <5013@mgweed.UUCP>
Date: Wed, 30-Nov-83 11:11:30 EST
Article-I.D.: mgweed.5013
Posted: Wed Nov 30 11:11:30 1983
Date-Received: Fri, 2-Dec-83 00:16:05 EST
Organization: AT&T Western Electric - Montgomery Illinois
Lines: 22


Has anyone out there experienced any audio problems with Kenwood
HF transcievers? A specific case I ran into recently was with
a 830 that a friend of mine has. The problem is RF getting into
the processor via the mic cord. The rig performs well with the
processor off but only when connected to a dummy load, will it
work with the processor on. His shack is about 40 feet immediately
below the 15 meter beam. We solved the problem by adding a .01 cap
between the mic lead and chassis ground (not the mic shield).

The problem occured with both the MC-50 desk mic as well as the
Kenwood mobile mic.

I also wonder why, if the mic shield and chassis ground are supposed
to be "separate", they put a cap between those 2 grounds (I forget
the pinout). This is the only problem like this I have ever hear of
with a piece of Kenwood gear.  I could perhaps understand it if he were
using a long wire or something with lotsa RF in the shack and getting
RF burns off the equipment......

K9EUI