HP 8920A Application Handbook page 206

Using the Spectrum Analyzer
To Demodulate the Product:
These steps are used to help determine which transmitter is causing the
distortion.
12. Position the marker on the desired carrier.
13. Select Marker To to Center Freq.
14. From the Controls select Marker.
15. Select Main from the Choices field.
16. Decrease the Span to 1.5 MHz (or less).
17. Adjust the Volume and Squelch controls to listen to the demodulated
product.
NOTE: On the TX TEST screen change the IF Filter to 230 kHz and/or AF Anl In if
necessary (e.g. to AM for aircraft).
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