[Elecraft] [KPA500] stuck on TX when AUXBUS attached

[Jim Brown]

On 9/14/2012 3:39 AM, Jack Brindle wrote:
> Yes. It must be disconnected.

FWIW, I've never used an AUXBUS connection to my KPA500, nor have I felt 
the need for one. I have only the AMP KEY line (PTT) between the K3 and 
the KPA500. When I change bands, I hit a dit or tap my mic, the KPA 
reads the frequency, changes bands, and is all set to go by the time 
I've found someone to TX to.  I'm beta-testing a KAT500, and I'm using 
it in the same manner.  With the KAT500, the AMP KEY line is "looped 
through" the KAT500 -- that is, K3 to KAT500, KAT500 to KPA500. There 
are two RCA jacks on the KAT500 that make this easy.

The only thing I use the AUX bus for is to drive a KRC2 that switches 
bandpass filters.

73, Jim K9YC