Modulation Analysis
R&S
®
Cable Rider ZPH
274
User Manual 1321.0950.02 ─ 07
12
Modulation Analysis
R&S Cable Rider ZPH option
R&S ZPH-K7 (order number: 1334.5633.02) option is required to operate the R&S
Cable Rider ZPH in both analog and digital demodulation mode.
This mode is only available with model .12.
12.1
Analog Demodulation
The Analog Demodulation measurement analyzes the AM or FM modulated signals
and calculates the
analog modulation parameters
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 Cable Rider ZPH 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 Cable Rider ZPH opens the mode menu.
2. Select the "Spectrum Analyzer" softkey.
The R&S Cable Rider ZPH opens a submenu that contains the spectrum analyzer
measurement menu items.
3. Select the "Analog Demod" menu item.
The R&S Cable Rider ZPH activates the mode for analog modulation.
See index 1 of
Figure 12-1
.
4. Press the [MEAS] key.
The R&S Cable Rider ZPH 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".
5. Select the analog demodulation domain you require and measurement selection to
view the measurement readings.
The R&S Cable Rider ZPH displays the respective analog modulation measure-
ment. See examples in
Figure 12-1
Analog Demodulation
