Configuring the Internal Baseband Source
R&S
®
SMW200A
375User Manual 1175.6632.02 ─ 16
Remote command:
[:SOURce<hw>]:BB:MCCW:STATe on page 989
Set to Default
Calls the default settings, see Table 4-28.
Remote command:
[:SOURce<hw>]:BB:MCCW:PRESet on page 989
Number of Carriers
Sets the number of carriers composing the multi-carrier CW signal.
Note: Cross-reference between total bandwidth, carrier spacing, and number of carri-
ers. The total bandwidth of the multi-carrier CW signal is calculated as follows:
Total Bandwidth = ("Number of Carriers" - 1) * "Carrier Spacing"
The result must not exceed the system bandwidth of the instrument (see data sheet).
If the total bandwidth is not respected, the value selected as "Carrier Spacing" is
reduced. Hence, the selected number of carriers defines the maximum carrier spacing.
By default, the multi-carrier table lists 64 carriers that are preset to the settings: "State
= ON", "Power = 0 dB", "Phase = 0°".
If the selected number of carriers is less than the carriers in the table, the superfluous
table rows are deleted. If the number of carriers exceeds the number of table rows,
new rows are appended to the table.
Remote command:
[:SOURce<hw>]:BB:MCCW:CARRier:COUNt on page 989
Carrier Spacing
Sets the spacing between carriers for the multi-carrier CW signal. The carriers are
arranged symmetrically around the HF carrier.
Remote command:
[:SOURce<hw>]:BB:MCCW:CARRier:SPACing on page 989
Clock Frequency
Displays the clock rate at which the multi-carrier CW signal is output by the arbitrary
waveform generator. The output clock rate depends on the number of carriers and the
selected carrier offset.
The value indicates the resolution during the marker generation.
Remote command:
[:SOURce<hw>]:BB:MCCW:CLOCk? on page 990
Optimize Crest Factor Mode
Selects the mode for automatically minimizing the crest factor. The carrier start phases
are automatically configured according to the selected mode.
Methods of reducing the crest factor differ regarding both the optimization achievable
and the time required for computation. For more information, refer to Chapter 4.5.1.7,
"Methods for Optimizing the Crest Factor", on page 250.
"Off"
There are no automatic settings for minimizing the crest factor. Use
the "Phase" parameter to set the start phase.
Generating Multi-Carrier Continuous Wave Signal
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