For a long time I have been plagued with RFI getting into my audio
whenever I used my Heil Sound foot switch on the microphone connector
PTT input of my Flex-5000A. That is the only band I had this problem on.
It was observable by using the monitor function. I tried chokes and such
to correct and none did.
For a long time, I simply made a point of not plugging in the foot
switch when on 17M. Since 17M isn't a contest band, not that big of a
deal; but I would forget to disconnect occasionally.
Today, it occurred to me why not try the rear panel PTT input instead.
That resolved the problem on 17M. No RFI on 17M now.
I will see how it does on the other bands. It makes sense that the RF
coupled onto the PTT microphone input could in turn couple into the
microphone audio input due to proximity, (internal cable, etc). This
possible coupling is removed by using the back panel PTT, or front as
the joke goes ;^) .
I have discussed this problem with other Flex-5000A users who have had a
similar problem. Perhaps this will be of benefit to them and others.
73,
Bill
NJ1H
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