Hi Bob,
I had similar problems with the TPA setting changing , and it
appeared to be caused mainly by my transmitting into a high SWR ( like
changing bands and not tuning for it on a manual ATU) I have never had the
problem again since I got the KAT100 ATU.
However, I *did* reduce the problem before getting the KAT100, by grounding
the shield of the KPA100 amp securely to the side panels, and filling in
the gap that was in the shield around the SO239 socket and grounding the
SO239 base solidly to the shield with a short bracket.
These alterations are incorporated in later issue KPA100's and may not be
an issue for you.
Cheers.......Ron ZL1TW
K2/100 #2204
K1 #575
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