Modulation Analysis
R&S
®
Spectrum Rider FPH
244
User Manual 1321.1011.02 ─ 11
3. Select the reference deviation you require.
See
Audio Lowpass
The "Audio Lowpass", a DPD (Digital Predistortion) designed filter is used to fine-tuned
the measurements demodulated signals.
1. Press [MEAS] key.
The R&S Spectrum Rider opens the analog modulation measurement menu.
2. Select the analog modulation domain you require, "AM Domain" or "FM Domain"
softkey.
3. Select "Audio Lowpass" softkey
A drop-down menu to select the audio lowpass filter opens.
4. Select the audio lowpass filter you require.
See
10.1.3.5
Defining FM Broadcast
Depending on the country-specific requirements, it maybe necessary to suppress the
display of higher frequency component of the modulation signal.
FM Broadcast
The FM broadcast is only enabled with the
or 300 kHz.
1. Press [BW] key.
2. Select "FM Broadcast" softkey.
A drop-down menu to select the filter opens.
3. Select the filter setting you require.
10.1.3.6
Limit Settings
The limit line available in the AM and FM summary measurement allows you to per-
form limit check on the measurements.
The limit line file is created using the "Ama AM Limits" or "Ama FM Limits" editor in the
R&S InstrumentView software package.
For information on the analog modulation limit line editor, see R&S InstrumentView
software manual.
1. Press [LINES] key.
2. Select "Select Limits" softkey.
Analog Demodulation
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