Demodulating An Fm Signal - Keysight Technologies N9322C User Manual

Demodulating an FM Signal

This section demonstrates how to demodulate and listen to
an FM signal using the built- in FM demodulator.
Using the built in FM demodulator you can tune to an FM
signal and view the results of the detector output as
displayed in the time- domain.
Press Preset. (With Preset Type of Factory)
1
2
Use a signal source or connect an antenna to recieve FM
signal. In this example the signal is modulated at 300 MHz
with FM deviation of 10 kHz and FM rate of 1 kHz.
If you are using a broadcast FM signal, the FM channels are broadcasting
N O T E
between 87.7 MHz to 107.7 MHz.
3
Set the center frequency to the center of the FM signal (in
this case 300 MHz):
Press Frequency > 300 > MHz.
4
Set the analyzer to zero span for time- domain analysis:
Press Span > Zero Span.
Press Sweep > Sweep Time > 5 > s.
5
Set the resolution bandwidth to capture the full bandwidth
of the FM signal.
Press BW > 100 > kHz.
6
Turn on the optional pre- amplifier to detect small signals:
Press Amplitude > Preamp On.
7
Turn on the FM demodulator:
Press Marker > Function > Demod
Press Demod Setting > Demod Type FM
Functions and Measurements
Demodulate the AM/FM signal
85