R&S FSH
Spectrum Analyzer Mode
Performing Spectrum Measurements
Operating Manual 1309.6275.12 - 14
57
Setting the channel spacing
In case of the R&S FSH, 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 some radio communication 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 adjacent channel. The R&S FSH 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.
M
Press the MEAS key.
M
Press the "Channel Settings" softkey.
M
Select the "Channel Spacing"
menu item.
The R&S FSH opens a dialog box
to define the spacings for all
transmission channels and
adjacent / alternate channels.
M
Select the channel you want to
change the spacing for.
M
Activate the input by pressing the
ENTER key.
M
Enter the channel spacing you need.
The R&S FSH now takes the new values into account for future measurements.
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 FSH 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.
If you do measurements on systems with a different channel spacing for each Tx
channel, you can also set the channel spacing for each Tx channel separately by
entering the respective number in the fields.
If the spacings are not equal, the channel distribution according to the center frequency
is as follows:
C
Odd number of TX channels
The middle TX channel is centered to center frequency.
