Functions and Measurements
Demodulate the AM/FM signal
72
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.
1 Press > Preset. (With Preset Type of Factory)
2 Use a signal source or an antenna for an FM signal to
analyze. In this example the signal source is used
transmitting at 300 MHz with FM deviation of 10 kHz and
FM rate of 1 kHz.
3 Set the center frequency to the center of the FM signal (in
this case 300 MHz):
Press > 300 > {MHz}.
4 Set the analyzer to zero span for time- domain analysis:
Press > {Zero Span}.
Press > {Sweep Time} > 5 > {s}.
Press > {Next Pk Right} or {Next Pk Left}
5 Set the resolution bandwidth to capture the full bandwidth
of the FM signal.
Press > 100 > {kHz}.
6 Turn on the pre- amplifier to observe the small signal:
Press > {Int Preamp On}.
Preset/
System
NOTE
If you are using a broadcast FM signal in the United States, for example,
the FM channels are broadcasting between 87.7 MHz to 107.7 MHz.
Frequency
SPAN
Sweep/
Trig
Peak
Search
BW/
Avg
Amplitude
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