To the last question - Yes. The KAT500 and KPA500 do not communicate through 
the AUX bus. Further, KAT500 is listen only, KPA500 is talk only, and KAT500 
cannot listen to the KPA500 data.

Jack, W6FB

> On Jun 21, 2018, at 6:19 AM, ANDY DURBIN <[email protected]> wrote:
> 
> My KPA500 receives serial data (listen only) from my TS-590 and follows 
> TS-590 band changes without needing RF input.   If I connect the KPA500 and 
> KAT500 with an AUX cable will the KAT500 be selected to the same band as the 
> KPA500 before receiving RF input? If so, what minimum pin connection set is 
> required?
> 
> 
> Asked another way - Is a K3 required for the AUX bus to have any 
> functionality?
> 
> 
> Thanks and 73,
> 
> Andy k3wyc
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