Spectrum Analyzer Mode
R&S
®
Cable Rider ZPH
183
User Manual 1321.0950.02 ─ 07
The R&S Cable Rider ZPH sets the appropriate span for the channel bandwidth
that you have entered according to the criteria described above. This ensures that
no incorrect channel power measurements are made.
The minimum channel bandwidth that you can set is 833 Hz at a span of 1 kHz.
Setting the channel spacing
In the R&S Cable Rider ZPH, the channel spacing is defined as the distance between
the center frequency of the transmission channel and the center frequency to the next
transmission channel or the distance between the center frequency of the transmission
channel and the center frequency of the adjacent channel.
Specific channel spacing definitions
Note that some radiocommunication standards, e.g. CDMA2000 DS / MC1 / MC3 and
IS95 B / C, IS97 B / C, IS98 B / C, define the channel spacing differently, namely the
distance from the center of the transmission channel to the closest border of the adja-
cent channel. The R&S Cable Rider ZPH does not consider these specifics. It always
regards the channel spacing as the distance between the center of a channel and the
center of its neighboring channel.
1. Press the [MEAS] key.
2. Select the "Channel Tx Spacing"" softkey to define the transmission channel spac-
ing or "Channel Adj Spacing"" softkey to define the adjacent / alternative channel
spacing.
The R&S Cable Rider ZPH opens a dialog box to define the spacing for all trans-
mission channels or adjacent / alternate channels.
3. Select the desired channel input field to change the spacing bandwidth.
4. Enter the channel spacing you need.
5. Select "Done" to apply the changes.
The R&S Cable Rider ZPH now takes the new values into account for future mea-
surements.
When performing measurements on multi-carrier signals, you can define the spacing of
the transmission (Tx) channels to one another. By default, the R&S Cable Rider ZPH
assumes equal spacing between all Tx channels in the system. Therefore, the spacing
you enter for the first two Tx channels is automatically applied to all other Tx channels.
Performing Spectrum Measurements
