Rohde & Schwarz R&S FPH, User Manual

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Analog Modulation
R&S ® Spectrum Rider FPH
228 User Manual 1321.1011.02 ─ 06.00
Scale Adjustment
The scale adjustment is only available in the "FM Domain" of "Mod Trace" measure-
ment.
1. Press BW key.
2. Select the "Scale Adjust" softkey.
The R&S Spectrum Rider performs an auto adjustment on the vertical axis in the
FM Domain of "Mod Trace" measurement.
RF Attenuation
For more information, see Chapter 6.2.3.5, "Setting the RF Attenuation" , on page 167.
Preamplifier (R&S FPH-B22)
For more information, see Chapter 6.2.3.6, "Using the Preamplifier (R&S FPH-B22)" ,
on page 169.
10.3.4 Defining Demodulation Bandwidth and Audio Lowpass Filter
Demodulation Bandwidth
The demodulation bandwidth defines the useful bandwidth used in the modulated sig-
nals.
1. Press [BW] key.
2. Select the "Manual DBW" softkey.
A drop-down menu to select the demodulation bandwidth opens.
3. Select the demodulation bandwidth you require.
See Chapter 10.1, "Demodulation Bandwidth" , on page 223 and Table 10-2 .
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 the "Audio Lowpass" softkey
A drop-down menu to select the audio lowpass filter opens.
4. Select the audio lowpass filter you require.
See Table 10-3 .
Performing and Configuring Measurements