I hook my TS-850 to the IF-output, it works fine. Make sure your "panorama-radio" is not able to transmit into your K3, e.g. use a RX-only input or modify it. I set the TS-850 to USB when listening to LSB-sigs on 80m. Why is this the case? Have not yet verified if that changes when listening to higher bands. Martin -- 73, DM4iM