Rohde & Schwarz SML01 - Phase Modulation

Test sequence R&S®SML / R&S®SMV03
1090.3123.12 10.26 E-6
Setting on the modulation
analyzer
- Stereo signal as for crosstalk attenuation measurement
- Demodulation: FM STEREO
- CHANNEL: L or R
- FILTER: CCIR WT or UNWT
- DETECTOR RMS
- Relative deviation measurement
- DEEMPHASIS 50 µs
Measurement
 Switch on the left or right channel on the stereo coder and carry
out a relative measurement. Then switch off the useful signal on
the stereo coder and read off the S/N ratio. Carry out this
measurement for both filters (weighted and unweighted). Then
switch on the right channel and repeat the same measurement.
Phase modulation
PhiM deviation setting
Test setup  Test setup 1, demodulator mode
Settings on R&S SML /
R&S SMV03
- LEVEL: 0 dBm
- FREQ: 1 GHz
- MODULATION  PhiM  PhiM DEVIATION: 5 rad
PhiM SOURCE: LFGen
LFGenFreq = 1 kHz
Settings on the test receiver - D
emodulation: PhiM
- D
etector: Peak
- Filter: 20 Hz to 23 kHz
(for the moment measurement must still be carried out with 50 Hz /
100 kHz, since filters are not yet implemented)
Measurement  Read off the phase deviation from the test receiver
Note: Since the R&S SML / R&S SMV03 has a purely digital deviation generator, it is adequate
to test its functionality by taking a measurement at one deviation setting and one frequency
only.