The K3S does transmit in Test mode. I've seen 50W of output from my KPA500, while in Test mode. I mentioned this on the reflector on 7/25/2017, topic "Test Mode Garbage." Wes N7WS On 11/17/2021 7:56 PM, Frank O'Donnell wrote: > If the K3S is placed in TEST mode for the purpose of CW practice without > transmitting ...