AFSK A and DATA A both transmit the same on mine. Using HRD here. I don't have the solution, but you are correct in that your K3 is not operating properly. 73 Bob -- View this message in context: http://n2.nabble.com/AFSK-A-not-working-while-DATA-A-is-tp4549740p4550024.html Sent from the Elecraft mailing list archive at Nabble.com.