On 8/1/2021 12:15 PM, Andy Durbin wrote: > KPA500 only needs to know the band but KAT500 needs to know the actual frequency within the band. Both are VERY quick to sense TX frequency. All it takes ia a dit or a tap on the mic. All they NEED from the rig are RF and a KEY or PTT voltage or closure. 73, Jim K9YC