Am newly qrv on satellite. Everything works. Using Pluto. GPS controlled 10MHz reference, 25MHz and 40MHz phase locked loops for LNB and Pluto. Console software.
However, there is a slight warble on the audio, especially noticeable on cw,
Looks to me like a 50Hz FM modulation. No amount of notching or low pass filtering makes any difference. If I look at the audio waterfall in fl digi, two lines can be seen to each side of the signal, about 50Hz apart. This audio comes straight out of the computer like that.
If it is mains hum, where does it come from? All power supplies are switchers, so no 50Hz from them. Has anybody had a similar problem?