No - it does not spontaneously go into transmit more. The problem is that on 
the non-Elecraft radio, placing the KPA into transmit mode (with a button push 
on the KPA) drops the non-Elecraft radio’s receive signal tremendously. See 
Jack’s explanation in an earlier post on what the K3 is doing to the “system” 
when it is powered off.

Jim / K7TXA

> On Apr 1, 2022, at 6:44 PM, Andy Durbin <[email protected]> wrote:
> 
> "Just gave it a try. No joy, same result - lowered rx signal strength on the 
> IC-705.  Jack indicated that the K3 sets the Vcc rail to zero volts on power 
> off, and that is causing the amp to go into Operate mode. "
> 
> Maybe I lost the plot but wasn't the problem that the KPA500 was being keyed, 
> not that it spontaneously went to operate mode.  KPA500 won't be keyed unless 
> one of the two keying inputs is pulled low.
> 
> Take control of KPA keying source and doesn't the problem go away?
> 
> Andy, k3wyc
> 
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