This waterfall is generated using the baseband I-Q signals from Soft66LC4. You have much wider bandwidth than is possible with the audio signal from IC-7410.
Frequency control of Soft66LC4 is not implemented yet, so CLI is being used now.
% soft66-control -t 7020 Tuned to 7020.000kHz % sprigmm /dev/ttyUSB0 hw:0,0 48000 2
IC-7410, terminated with a dummy load, is used as a signal source, and the frequency is changed from 7000kHz to 7050kHz with a step size of 1kHz. The DC is on the right (or left) edge of the waterfall. Side band suppression is not very good, because neither the gain nor the phase is adjusted for I-Q signals, but you can see which is the image.
This with IC-7410. The bandwidth of the audio signal is 3.0 kHz with USB mode. The waterfall is symmetrical because the incoming signal is real, and only the amplitude of the FFTed signal is displayed.
% sprigmm /dev/ttyUSB0 hw:2,0 32000 1
Note that the FFT size is now 1024 instead of previous 4096.
