Modulation Analysis
R&S
®
Spectrum Rider FPH
235
User Manual 1321.1011.02 ─ 11
10
Modulation Analysis
R&S Spectrum Rider option
R&S FPH-K7 (order number: 1321.0696.02) option is required to operate the R&S
Spectrum Rider in both analog and digital demodulation mode..
10.1
Analog Demodulation
The Analog Demodulation measurement analyzes the AM or FM modulated signals
and calculates the
using the measurement results. Note
that the measurement works properly only if you apply an amplitude or frequency
modulated signal. This firmware option provides the necessary measurement functions
to analyze amplitude and frequency modulated signals.
The digital signal processing in the R&S Spectrum Rider is used for demodulating
amplitude and frequency modulated signals.
By sampling (digitization) already at the IF and digital down-conversion to the base-
band (I/Q), the demodulator achieves maximum accuracy and temperature stability.
There is no evidence of typical errors of an analog down-conversion and demodulation
like AM to FM conversion and vice versa, deviation error, frequency response or fre-
quency drift at DC coupling.
1. Press [MODE] key.
The R&S Spectrum Rider opens the mode menu.
2. Select "Analog Demod" softkey
The R&S Spectrum Rider activates the mode for analog demodulation.
See index 1 of
3. Press [MEAS] key.
The R&S Spectrum Rider opens the analog demodulation measurement menu.
The measurements are performed in two analog demodulation domains: "AM
Domain" or "FM Domain" and the measurement readings are available in two dif-
ferent selections: "Mod Trace" and "Mod Summary".
4. Select the analog demodulation domain you require and measurement selection to
view the measurement readings.
The R&S Spectrum Rider displays the respective analog demodulation measure-
ment. See examples in
Analog Demodulation
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Allice Messtechnik GmbH
