Configuring the Internal Baseband Source
R&S
®
SMW200A
385User Manual 1175.6632.02 ─ 16
How to observe the effect?
Use the built-in real-time graphical display ("System Configuration > Graphics > Con-
stellation") and observe that the points on the I/Q constellation diagram are turning
counterclockwise, see Chapter 8.1, "Displaying Baseband Signal Characteristics in
Real-Time", on page 559.
4.12.1.3 Impact of the Gain
The "Gain" of the different baseband sources determine the relative gain of the associ-
ated signals relative to each other.
In "System Configuration > Standard Mode", the baseband signal can be additionally
faded and routed at the output of the fading simulator, in the way that the faded signals
from the basebands are summed. The real gain of such signal is measured at the out-
put of the "Fading" block and set with the fading parameter "Summation Ratio A/B"
(see description “Fading Simulator”, section “Summation Ratio A/B”).
The relative gain set with the parameter "Gain" in the "Baseband" block is ignored.
The real gain in a signal path depends on the following parameters along with the
defined baseband gain:
●
Signal characteristics, in particular the crest factor
●
Number of baseband sources
●
Overall RF output level.
How to observe the effect?
To verify and visualize the cumulative baseband signal, use:
●
the "System Configuration > Graphics > Power Spectrum" view, see "To set and
verify path gain and routing" on page 581.
See also Chapter 2.3.6, "Verifying the Generated Signal with the Graphics Dis-
play", on page 83.
●
the "Setup > Baseband Powers Simulation" dialog, see Chapter 8.2, "Querying
Information on the Baseband Power Levels", on page 588.
4.12.2 Baseband Offsets Settings
Access:
► Select "Baseband > Baseband Offsets" or "BB Input > Baseband Offsets".
The "Baseband Offsets" dialog provides the settings necessary to add frequency
and/or phase offset or a path gain to the baseband signals relative to each other.
Shifting and Boosting the Baseband Signal
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