Configuring the RF Signal
R&S
®
SMW200A
468User Manual 1175.6632.02 ─ 30
The function allows fast level changes of the internal I/Q signals. You can determine an
attenuation value between -3 dB and +80 dB. The instrument calculates the digital
attenuation to the Level
PEP
and the Level
rms
as follows:
Level
PEP(RF output)
= Level
PEP
- Digital Attenuation
Level
rms(RF output)
= Level
rms
- Digital Attenuation
The level range changes accordingly.
Note: The digital attenuation has no effect on the RF output level when you work in
CW mode or with externally applied I/Q signals, i.e. with unmodulated signals.
If the digital attenuation effects the RF level, the R&S SMW indicates the resulting level
in the "Status bar". It is also denoted by an icon next to the level indicator.
See "Level Offset & Level EMF Offset & Level Ucor & Level Digital Attenuation"
on page 1295.
Note also that several other parameters affect the displayed RF level value.
See Chapter 8.4.4.1, "Displayed RF Frequency and Level Values with Downstream
Instruments", on page 472.
Remote command:
[:SOURce<hw>]:POWer:ATTenuation:DIGital on page 1191
Mode
Allows you to optimize the RF output signal for applications, where improved harmonic
distortion or improved wideband noise is required.
"Normal"
Generates an RF output signal with high signal to noise ratio as well
as low distortion, according to the data sheet.
"Low Noise"
Optimizes the signal to noise ratio.
"Low Distortion"
Reduces distortion (harmonics) of the RF signal to a minimum.
Remote command:
[:SOURce<hw>]:POWer:LMODe on page 1193
Setting Characteristics
Selects additional quality characteristics to optimize the behavior of the RF signal level
for the specific application.
"Auto"
Sets the RF output level automatically according to the selected
mode.
In this mode, the instrument provides the highest dynamic range and
fastest setting times, as specified in the data sheet.
The RF signal is shortly blanked when the step attenuator is switch-
ing.
Configuring RF Frequency and Level
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