[Elecraft] K3 Receive Attenuation with KPA500 in Operate

[Brian F. Wruble]

Hi all:

I am running a newly assembled "K-Line" --- K3/100, KPA500 and KAT500.  The
K3 is pretty "loaded" with KRX3, KAT3, KXV3A, etc.

I just noticed that received signals are down 4 S-units when the KPA500 is
in Operate.  In Standby, signals pop right up.

Reading past reflector emails on the topic, I found one thread that
suggested this may have to do with the state of the KPA500 PTT.  I found
that pulling the PTT RCA plug out ended the problem.

Then I replaced the PTT plug, and still had no problem.  However, once I
actually transmitted, and the PTT acted to key the KPA500, the problem
recurred >>> Low sigs when the amp is in Operate, Full sigs when in Standby.

Has anyone figured out a fix for this?

73 de Brian W3BW


*Brian F. Wruble, C.F.A.

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