During the Wisconsin QSO Party this weekend I experienced on a few occasions were a strong signal was near zero beat (maybe +/-50Hz or better), but all I could hear was "thumping" of the signal. So these people were calling me, but I could not hear the 600Hz sidetone. In order for me to hear them, I enabled RIT and tuned a few hundred hertz up. I could see them in the passband of panadapter.
- Issue was with about 5 strong signals- Filter centered and 200-400Hz wide- Signal was visible near zero beat on NaP3 panadapter within pass band. I/Q input to PC for visual spectrum only. Not using audio from PC.- Preamp off in many/all cases on 40 meters.- Listening to audio via stereo headphones direct to radio.- Firmware updated last fall.
Any ideas or known issues in this scenario?
Scott, KB0KFX
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