I have just received my K3 factory built and been playing with it for the
last two days. I immediately discovered RF feedback problem which was cured
by connecting pin 7 of the mike plug to the shell of the connector. I do
plan to use rear mike and audio connectors as well but I am getting a bit
confused with what exactly needs to be modified to avoid RF feedback. I would
really like to get inside only once. May be Elecraft can officially issue
recommendations for the mod regarding this RF feedback issue. Hopefully the
one that would require minimum surgery on the radio.
73, Igor UA9CDC
L5 - Line In (J21);
L3- Line Out (J22);
These are transformer isolated and not returned to frame or chassis ground
specifically to avoid ground loop problems. The inductors are there to
help keep RF out. These "commons" are notational - they are not common
with anything.
73,
Lyle KK7P
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