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85
Functions and Measurements
Demodulate the AM/FM signal
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 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.
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
NOTE
If you are using a broadcast FM signal, the FM channels are broadcasting
between 87.7 MHz to 107.7 MHz.