> I can only figure one possible how someone is exactly on PTOS Fx and > repeated keep calling directly on the DX Transmit frequency and that > is that they have their radio set split and then reversed it while > still listening to both frequencies simultaneously. This way they > would hear the DX call but not know they were actually transmitting > on the calling frequency. Gents, Some radios, like the IC775, have a nasty surprise when the radio is operated in the split mode. As I remember it, when the "receive" VFO is set on the DX freq, it supposed to be turned off/attenuated while transmitting. True, it's down about 50db. The surprise is when the attenuated signal is run through a KW amp along with the "normal" TX freq. There's enough signal transmitted on the DX station's freq to easily cause QRM!! It gets worse when on say, 10m. 73, Charlie, N0TT _______________________________________________ Topband reflector - topband@contesting.com