The thing that confuses me is why is it during the sweeps due the fft look so different in each of the windows and it seems like the timing of the sweeps are different. The sweeps happen at the same time for each dongle, right? The dongles are all listening in parallel at the same time? If so, seems like they would look more alike at the same time. My apologies for the density on this end.
73 wa5ngp