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What does the frequency  stand for  if you choose 2 in_voltages and capture a spectra of FM band via IIO Oscillascope?

Question asked by yanjiesh on Oct 9, 2014
Latest reply on Nov 3, 2014 by larsc

Dear all,


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:

FM Band Spectra_inVoltage2&3.png

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.


Jie Yan