I'm getting the FSK signal from the satellite in I/Q format (see the last 2 waves at the bottom of the picture).
After applying Quadrature Demodulation, I'm getting the top wave.
The questions are:
- Why do I see a periodic change in the amplitude? (red line).
- Can it be related to the right/left-handside polarization of the satellite signal? Or is it some kind IQ imbalance?
- How to compensate it?