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

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

Demodulating an FM Stereo/RDS Signal

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:
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.
Keysight N9063C Analog Demod Measurement Guide
FM reference deviation: 75 kHz
Pilot deviation: 10%
Pilot frequency: 19 kHz
Stereo frequency: 38 kHz
Left only tone: 1.0 kHz
RDS deviation: 6%
RDS frequency: 57 kHz
Action
Mode/Meas
— Press
Demod
.
Mode Preset
— Press
Mode/Meas
— Press
Stereo/RDS
FREQ Channel
— Press
Center Freq
AF Stop Freq
— Press
Meas Setup
— Press
Ad vanced Ref Deviation
,
kHz
75, .
Notes
Analog
,
.
FM
,
.
AF start frequency and AF stop
,
frequency settings determine the span
MHz
, 98, .
of the X axis in AF Spectrum window in
kHz
, 65, .
MPX, Mono, Stereo, Left, and Right
views.
,
,
13