I am hearing a rapid relay-type rattling noise from my K3 whenever I transmit 
over 30W barefoot and the PR6 with the ACC option is connected. This wasn't 
happening before I added a KPA500 into the mix. I don't hear the noise when 
power is below 30W barefoot, nor when the KPA500 is inline.
 
I am using the KPA500 AUX cable, and the Elecraft Y cable from the K3 so I can 
connect both the ACC option for the PR6 and the KPA500 to the K3 ACC port.
 
I have searched the reflector for insights on this behavior and why it is 
happening, but not sure anything I've found applies--expept the possibility of 
needing to remove pin 10 from the KPA500 AUX cable--?
 
Guidance, wisdom and other assists are most appreciated. Thanks.
 
73 Paula k9ir
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