[Elecraft] KPA 500 Attenuated Receive Signals

[Barry Simpson]

My KPA 500, which is several years old, has just developed an issue which
so far I have been unable to resolve.

What has happened is that when I put the amplifier into OPER, the received
signal strength drops by several S units. It transmits normally and also
receives normally in STBY.

The issue occurred when I was changing rigs to use with the KPA500.
Specifically I connected a Ten Tec Omni 6 but I cannot see how that could
have caused the issue. However, the KPA500 now exhibits the same issue with
my TS990 which it never has before.

I believe that some considerable time ago, I did experience a similar
situation and after reading all the manuals etc I found a way to resolve
it. However, I have read the manual until I am blue in the face but I
cannot find an answer this time.

Of course I may have initiated a fault in the KPA500 but I would be
surprised as it has taken all the mistakes I have thrown at it over the
years and it has not so much as blinked.

Any suggestions on how to sort the issue out, or what damage I might have
caused to the switching circuitry, would be appreciated.

Thanks in advance.

Barry Simpson  VK2BJ