Spectrum Measurements
R&S
®
ESRP
209
User Manual 1175.7445.02 ─ 08
The value entered for any TX channel is automatically also defined for all subse-
quent TX channels. Thus, only one value needs to be entered if all TX channels
have the same bandwidth.
The value entered for any ADJ or ALT channel is automatically also defined for all
alternate (ALT) channels. Thus, only one value needs to be entered if all adjacent
channels have the same bandwidth.
Defining Channel Spacings
Channel spacings are normally defined by the selected standard but can be changed.
If the spacings are not equal, the channel distribution according to the center frequency
is as follows:
Odd number of TX channels
The middle TX channel is centered to center frequency.
Even number of TX channels
The two TX channels in the middle are used to calculate the fre-
quency between those two channels. This frequency is aligned to
the center frequency.
► In the "Channel Setup" dialog box, select the "Spacing" tab to define the channel
spacings.
The value entered for any TX channel is automatically also defined for all subse-
quent TX channels. Thus, only one value needs to be entered if all TX channels
have the same spacing.
If the channel spacing for the adjacent or an alternate channel is changed, all
higher alternate channel spacings are multiplied by the same factor (new spacing
value/old spacing value). The lower adjacent-channel spacings remain unchanged.
Only one value needs to be entered for equal channel spacing.
Example: Defining channel spacing
In the default setting, the adjacent channels have the following spacing: 20 kHz
("ADJ"), 40 kHz ("ALT1"), 60 kHz ("ALT2"), 80 kHz ("ALT3"), 100 kHz ("ALT4"), …
If the spacing of the first adjacent channel ("ADJ") is set to 40 kHz, the spacing of all
other adjacent channels is multiplied by factor 2 to result in 80 kHz ("ALT1"), 120 kHz
("ALT2"), 160 kHz ("ALT3"), …
If, starting from the default setting, the spacing of the 5th adjacent channel ("ALT4") is
set to 150 kHz, the spacing of all higher adjacent channels is multiplied by factor 1.5 to
result in 180 kHz ("ALT5"), 210 kHz ("ALT6"), 240 kHz ("ALT7"), …
For the R&S
ESRP, the channel spacing is defined as the distance between the center
frequency of the adjacent channel and the center frequency of the transmission chan-
nel. The definition of the adjacent-channel spacing in standards IS95C and CDMA
2000 is different. These standards define the adjacent-channel spacing from the center
of the transmission channel to the closest border of the adjacent channel. This defini-
tion is also used for the R&S
ESRP if the standards marked with an asterisk
*)
are
selected.
Measurements
