Configuring the Signal in the RF Domain
R&S
®
SMW200A
522User Manual 1175.6632.02 ─ 16
The configuration "RF Off Mode > Unchanged" ensures that constant VSWR is
maintained if you turn the signal off and on again.
●
Highest level accuracy
Enter the target level value in "Fixed" mode and activate ALC (automatic level con-
trol)
In this operating mode, the generator adjusts the output level whenever the fre-
quency or level setting changes.
●
Noise sensitive applications
The parameter "RF OFF Mode > Full Attenuation" sets maximum attenuation and
thus suppresses noise when you turn off the RF signal.
Interactions and characteristics
●
The spectral purity of the RF output signal decreases with high attenuation.
●
Fixed mode is effective when automatic level control is activated (ALC State = On).
●
The setting of the RF OFF Mode > Full Attenuation has priority over the RF level
Mode > Fixed or Manual, regardless of the selected settings characteristics.
7.8.1.1 Attenuator Settings
Access:
► Select "RF" > "RF Level" > "Level > Attenuator".
In the "Attenuator" dialog, you can select the operating mode of the electronic
attenuator, the instrument is equipped with.
The remote commands required to define these settings are described in Chap-
ter 13.15, "OUTPut Subsystem", on page 808 and Chapter 13.18.15,
"SOURce:POWer Subsystem", on page 1092.
Improving Level Performance
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