Rohde & Schwarz FSW13, User Manual

Page: 171 / 1150

Measurements
R&S
®
FSW
171 User Manual 1173.9411.02 ─ 19
Gap (CACLR) Channel Definition
Between two sub blocks in an MSR signal, two gaps are defined: a lower gap and an
upper gap . Each gap in turn contains 2 channels, the CACLR channels . The channels
in the upper gap are identical to those in the lower gap, but inverted. Thus, in the
R&S
FSW MSR ACLR measurement, only 2 gap channels are configured.
Gap channels (CACLR) are indicated by the names of the surrounding sub blocks (e.g.
"AB" for the gap between sub blocks A and B), followed by the channel name ("Gap1"
or "Gap2") and an "L" (for lower) or a "U" (for upper). Both the lower and upper gap
channels are displayed. However, if the gap between two sub blocks is too narrow, the
second gap channel may not be displayed. If the gap is even narrower, no gap chan-
nels are displayed.
Gap (CACLR) Channel Spacings ← Gap (CACLR) Channel Definition
CACLR channel spacings are normally predefined by the MSR standard but can be
changed.
CACLR channels are defined using bandwidths and spacings, relative to the outer
edges of the surrounding sub blocks. Since the upper and lower CACLR channels are
identical, only two channels must be configured. The required spacing can be deter-
mined according to the following formula (indicated for lower channels):
Spacing = [CF of the gap channel] - [left sub block center] + ([RF bandwidth of left sub
block] /2)
Spacing = [CF of the gap channel] - [left sub block center] + ([RF bandwidth of left sub
block] /2)
(See also figure 5-24 and figure 5-25 .)
For details see chapter 5.3.6.3, "How to Configure an MSR ACLR Measurement" ,
on page 174.
Remote command:
[SENSe:
​
]POWer:
​
ACHannel:
​
SPACing:
​
GAP<gap>
​
on page 720
Gap (CACLR) Channel Bandwidths ← Gap (CACLR) Channel Definition
The gap channel bandwidth is normally predefined by the transmission technology
standard. The correct bandwidth is set automatically for the selected technology. The
bandwidth for each channel is indicated by a colored bar in the display (if the gap is not
too narrow, see
"Channel display for MSR signals" on page 147).
Remote command:
[SENSe:
​
]POWer:
​
ACHannel:
​
BANDwidth|BWIDth:
​
GAP<gap>
​
on page 716
Weighting Filters ← Gap (CACLR) Channel Definition
Weighting filters allow you to determine the influence of individual channels on the total
measurement result. For each channel you can activate or deactivate the use of the
weighting filter and define an individual weighting factor ("Alpha" value).
Remote command:
[SENSe:
​
]POWer:
​
ACHannel:
​
FILTer:
​
STATe:
​
GAP<gap>
​
on page 716
[SENSe:
​
]POWer:
​
ACHannel:
​
FILTer:
​
ALPHa:
​
GAP<gap>
​
on page 716
Channel Power and Adjacent-Channel Power (ACLR) Measurement