[net.ham-radio] RF in audio ckt problem with 830

rjr@mgweed.UUCP (11/30/83)

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