This may be reciprocal mixing in your soundcard, I see the same with an old SoundBlaster but not with my Delta-44.
----- Original Message ----- From: Kevin & Natalia Yesterday, while tuning around I found 2 strong signals in the waterfall, and one could see the main signal, and then 2 spurries either side. I was able to decode the PSK without any problems. The waterfall was thick in display, showing the signal was strong. I even listened to the received signal, and it sounded okay. IMD was around -25dB
