I had the KPA500 PIN diode problem in 2015, and it started on one band
only. And it did not happen all the time. After a while it became worse
and more bands were affected.
So based on my experience with my KPA500 #1497, I suggested the PIN
diode problem as a possiblity.
I wonder what the serial number is of the KPA500 we are talking about,
and whether it is produced before or after a change in the design(?).
Anyway, when I presented this problem (how it presented itself on my
KPA500) in the group and to elecraft support, I never got the right answer.
After basic faultfinding I found that the PIN diode circuit was causing
the strange behaviour of the linear and then... presto... there was a
elecraft-mod that I never heard of before.
It contained a few new switching components and some capactiors for one
of the LP-filters.
After putting those in, problem was solved. My K3 line and me lived
happy ever after :-).
73
Arie PA3A
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