I tried to use IIO Oscillascope to observe FM band spectra. When I choose 2 in_Voltages, the spectra shows an extra part of itself. The spectra is as follows:
Whereas it is shown in the following way if I only choose one in_voltage.
I would like to talk about the frequency of Marker 10 in the upper picture.
What does it mean?
Is it a product of coherent demodulation when the real signal spectra is being transferred to the zero IF band?
Those attached files are the Oscillascope settings screenshots.