Tom, Did you connect the KX3 Keyout signal into the KXPA100 PA KEY input? That is necessary for 'Basic Operation' - see page 18 of the manual. 73, Don W3FPR On 10/27/2017 3:24 PM, Tom wrote: > Hi, > Just to be sure, I disconnected all control signal, only RF into the amp > at 10W.... > No output, but no errors in the KXPA100 utility.