Rohde & Schwarz CMW-KE100, User Manual

Page: 269 / 938

1xEV-DO Measurements
R&S
®
CMW-KM8xx/-KS8xx
269 User Manual 1173.9511.02 ─ 12
User Margin
Margin that the R&S CMW adds to the "Expected Nominal Power" in order to deter-
mine its reference power ("Ref. Level"). The "User Margin" is typically used to account
for the known variations of the RF input signal power, e.g. the variations due to a spe-
cific channel configuration.
The appropriate values depend on the configuration of the RL 1xEV-DO signal, e.g. on
the active channels and gain factors. A typical value for the user margin is 9 dB.
Remote command:
CONFigure:EVDO:MEAS<i>:RFSettings:UMARgin
3.3.3 Trigger Settings
The "Trigger" parameters configure the trigger system for both TX measurements: the
1xEV-DO multi evaluation and OLTR measurement.
Fig. 3-21: Multi evaluation configuration: trigger
Trigger Source ............................................................................................................ 269
Trigger Slope ...............................................................................................................270
Trigger Threshold ........................................................................................................270
Trigger Delay ...............................................................................................................270
Trigger Timeout ...........................................................................................................270
Minimum Trigger Gap ................................................................................................. 271
Trigger Source
Selects the source of the trigger event. Some of the trigger sources require additional
options.
●
Free Run:
The measurement starts immediately after it is initiated. The R&S CMW decodes
the signal and derives its slot timing. This procedure is repeated after each mea-
surement cycle.
●
IF Power
The measurement is triggered by the power of received signal, converted to an IF
signal. The trigger event coincides with the rising or falling edge of the detected
1xEV-DO power step. This setting can be used to measure short signal bursts
when no continuous 1xEV-DO signal is available (see
Trigger Slope ).
The trigger event has to be synchronized to the start of frame. To achieve that, it is
necessary to adjust the
Minimum Trigger Gap .
●
IF Auto Sync
GUI Reference
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