[Elecraft] KPA500 Aux Cable Pin 11 Problem with Preamp

[Mike K2MK]

I had a problem that I remembered reading about on the reflector when I
hooked up my new KPA500 to my K3 with PR6/10 preamp using the Elecraft Aux
cable and the companion Y cable. I searched the archive and discovered that
users found it necessary to remove pin 11 from the cable to the KPA500. The
problem I experienced was that the preamp was powered up on all bands not
just 6/10/12 meters. I only noticed it when I tried to use my separate
receive antenna on 80 and 40 meters. Since the preamp was powered up the RX
ANT bypass in the preamp did not function so the K3 never saw my receive
only antenna. Removing pin 11 from the Aux cable to the KPA500 solved the
problem.

I'm surprised there is no mention of this problem and its solution in the
KPA500 manual. I think an alert should be added. 

73,
Mike K2MK



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