Modulation Analysis
R&S
®
Cable Rider ZPH
288
User Manual 1321.0950.02 ─ 07
ence filter or measurement filter, are automatically selected by the R&S Cable Rider
ZPH.
1. Press [MEAS] key.
The R&S Cable Rider ZPH opens the measurement menu.
2. Select the "Demod Parameters " softkey.
The R&S Cable Rider ZPH opens a submenu that contains the demodulation
parameters.
Selecting the filter type and roll-off factor of the measurement filter
Figure 12-4: Block diagram of measurement filter
1. Select the "Filter Type" softkey.
Alternatively, select "Filter" in the
Parameter View
to select the filter.
The R&S Cable Rider ZPH opens a submenu that contains the different type of fil-
ter for selection.
● "Root Raised Cosine" - Frequently used in the transmitter and receive filter to
perform matched filtering. It helps to remove the Inter-symbol interferences and
also to improve the use of spectral efficiency
● "Raised Cosine"" - The combined response of two RRC is the result of a raised
cosine filter
● "Gaussian" - Typically used in the FSK modulation
● "Unfiltered" - No filter used
2. Select the required filter type.
3. Select the "Demod Parameters " softkey.
The R&S Cable Rider ZPH opens a submenu that contains the demodulation
parameters.
4. Select the "Alpha/BT" to define the roll-off factor of the filter.
Alternatively, select "Alpha/BT" on the
Parameter View
to define the roll-off factor of
the filter.
The R&S Cable Rider ZPH opens an entry box to enter the roll-off factor.
Digital Demodulation
