Signal Routing and System Configuration
R&S
®
SMW200A
216User Manual 1175.6632.02 ─ 16
Figure 3-26: Example of test setup (simplified)
The procedure describes the configuration in the default state of the instrument, i.e.
"System Config > Fading/Baseband Configuration > Mode > Standard".
In "Mode > Advanced" and with coupled baseband sources, the steps differ.
1. Connect the external digital signal source to one of the digital input interfaces of
the instrument, e.g. the CODER1.
2. If the "BB Input" block is not displayed in the block diagram, select the input symbol
"CODER 1".
3. Select "BB Input > Signal Routing".
Adjust the required signal switching.
4. Select "BB Input > Baseband Offsets".
Adjust the frequency offset and the path gain settings, if necessary.
5. In the "Baseband Input Settings > Sample Rate" dialog, adjust the sample rate
source and value.
6. In the "Baseband Input Settings > Input Level Settings" dialog adjust the "Crest
Factor", "Peak Level" and "Level" values of the external input signal in one of the
following ways:
a) Find out these values and enter them manually.
b) Set appropriate "Measurement Period" and trigger "Auto Level Set".
To ensure accurate level measurements, select a measurement period that is
long enough to capture several periods of the input signal.
c) Enable "DIG IQ Auto Settings"
The R&S SMW receives peak level, level and crest factor values directly from
the connected transmitter and recognizes changes automatically.
Based on these values, the internal gain control adjusts the input signal gain to
achieve an optimal dynamic range.
Tip: Achieving correct signal leveling with external baseband signals requires one
measurement per each baseband source with an appropriate measurement time.
Perform the same steps in the other basebands, if an external digital signal is fed
to the other digital input connectors.
How to Connect External Instruments and Configure the Signal Flow
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