Demodulating An Fm Signal - Keysight N9030A Measurement Manual

Demodulating AM, FM, ΦM, FM Stereo/RDS Signals

Demodulating an FM Signal

Demodulating an FM Signal
This section demonstrates how to demodulate and listen to an FM signal. You can
tune to an FM signal and view the results of the detector output displayed in the
quad-view window or single-window format.
Alternatively, the demodulated signal is also available as an audio output (to the
speaker or headphone jack) and as video output (on the rear panel).
The signal under test is a signal at 300 MHz with FM deviation of 10 kHz and FM
rate of 1 kHz. Note that if you are using a broadcast FM signal in the United States,
for example, the FM channels are broadcasting between 87.7 MHz and 107.7 MHz.
Step
1 Select Analog Demod
mode.
2 Preset the mode.
3 Select FM measurement.
4 Set the center frequency to
the center of the FM signal.
5 Adjust the sweep time and
view the measurement
result as in the figure below.
6 Listen to the demodulated
FM signal.
Action
Press Mode, Analog Demod.
Press Mode Preset.
Press Meas, FM.
Press FREQ Channel, Center
Freq, 300, MHz.
Press Sweep, Demod Wfm
Sweep Time, 2, ms.
Press Meas Setup, Demod to
Speaker.
12
Notes
You may need to adjust the
volume as necessary.