Demodulating An Fm Stereo/Rds Signal; Measuring L Only Fm Stereo/Rds Signals - Keysight N9030A Measurement Manual

Demodulating an FM Stereo/RDS Signal

This section demonstrates how to demodulate and listen to an FM Stereo signal and
view key messages carried in RDS (Radio Data System). You can tune to an FM
Stereo/RDS signal and view the measurement results of the multiplexed signal, the
mono signal, the stereo signal, the left and right channel of the stereo signal, and the
RDS messages in separate views.
Alternatively, the demodulated FM Stereo signal is also available as an audio output
(to the speaker or headphone jack).
Measurement procedures for two typical FM Stereo/RDS signals are introduced
here:
"Measuring L Only FM Stereo/RDS Signals" on page 13
"Measuring L=R FM Stereo/RDS Signals" on page 19

Measuring L Only FM Stereo/RDS Signals

The parameters of the signal under test are as below.
FM reference deviation: 75 kHz
Pilot deviation:
Pilot frequency: 19 kHz
Stereo frequency: 38 kHz
Left only tone:
RDS deviation:
RDS frequency: 57 kHz
Step
1 Select Analog Demod
mode.
2 Preset the mode.
3 Select FM Stereo/RDS
measurement.
4 Set the center frequency to
the center of the signal and
set the AF stop frequency.
5 Set the FM reference
deviation.
Demodulating AM, FM, ΦM, FM Stereo/RDS Signals
10%
1.0 kHz
6%
Action
Press Mode, Analog Demod.
Press Mode Preset.
Press Meas, FM Stereo/RDS.
Press FREQ Channel, Center
Freq, 98, MHz.
Press FREQ Channel, AF Stop
Freq, 65, kHz.
Press Meas Setup, Advanced,
Ref Deviation, 75, kHz.
13
Demodulating an FM Stereo/RDS Signal
Notes
AF start frequency and AF stop
frequency settings determine the
span of the X axis in AF Spectrum
window in MPX, Mono, Stereo, Left,
and Right views.