That make no sense to me. On 6/21/2018 6:54 AM, Jack Brindle wrote: > 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 >