R&S FSH
Spectrum Analyzer Mode
Performing Spectrum Measurements
Operating Manual 1309.6275.12 - 14
53
Screen Layout for ACLR measurements
1
Standard
2
Marker information
3
Limit check information
4
Channel information
5
TX channel (red line)
6
Adjacent channel (green line)
7
Alternate channels (green lines)
8
Marker (blue line)
9
ACLR softkey menu
The predefined standards are the same as for channel power measurements (3GPP
WCDMA, cdmaOne and CDMA2000 1x systems). However, you can also customize
the settings to set up the R&S FSH for other radio communication standards. You can
define the settings directly on the R&S FSH or define and manage them using the
R&S FSH4View software.
When customizing settings, make sure to consider the following points to get valid and
accurate measurement results:
C
Reference level
Make sure not to overload the R&S FSH as the power is measured with a
resolution bandwidth that is small in comparison with the signal bandwidth. As with
Channel Power measurements, automatically set the reference to an optimal level
with the "Level Adjust" softkey.
C
Setting the span
The frequency span must at least cover the carriers and the adjacent channels
plus a measurement margin of about 10 % to get valid results.
If the span is automatically calculated by the R&S FSH with the "Auto Span"
function, the span is calculated as follows:
(No. of transmission channels - 1) x transmission channel s
2 x transmission channel ban measurement margin
with the measurement margin being approx. 10 % of the value obtained by adding
the channel spacing and the channel bandwidth.
