R&S SGT100A User Manual page 128

®
R&S SGT100A
"Arbitrary Carrier Frequency"
Remote command:
[:SOURce<hw>]:BB:ARBitrary:MCARrier:CARRier:MODE
Number of Carriers
Sets the number of carriers for the multi carrier waveform.
By default the multi carrier table lists 1 carrier. When the number of carriers is
increased, the multi carrier table is extended by adding further lines at the end of the
table. If these carrier already have been defined before, the settings are preset accord-
ing to the former settings. Otherwise the parameters are preset with the default values.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:MCARrier:CARRier:COUNt
Carrier Spacing
Sets the frequency spacing between adjacent carriers of the multi carrier waveform.
The carriers are arranged symmetrically around the RF carrier and the maximum car-
rier spacing is limited to:
"Carrier Spacing" = Total Baseband Bandwidth /("Number of Carriers" - 1).
The total baseband bandwidth is 160 MHz.
Note: In order to avoid wrap-around problems, the effective "Carrier Spacing" might be
slightly modified.
The "Carrier Spacing" is rounded in that way that the carrier closest to the center RF
frequency shows no phase jump assuming that the carrier is unmodulated.
●
For odd number of carriers:
RoundedCarrierSpacing=1/OutputSignalDuration* round(CarrierSpacing * Output-
SignalDuration)
●
For even number of carriers:
RoundedCarrierSpacing=2/OutputSignalDuration*round(0.5 *CarrierSpacing * Out-
putSignalDuration)
Remote command:
[:SOURce<hw>]:BB:ARBitrary:MCARrier:CARRier:SPACing
Crest Factor Mode
Selects the mode for optimizing the crest factor by calculating the carrier phases.
The crest factor represents the ratio of the peak voltage value to the rms voltage value.
The higher the crest factor and resulting dynamics of a signal, the greater the require-
ment for a power amplifier fed by the signal to be linear.
The following modes are available:
"Off"
"Minimize"
User Manual 1176.8674.02 ─ 07
Enables you to specify the carrier frequency in the carrier table. Car-
rier spacing is not relevant.
There is no automatic setting for minimizing or maximizing the crest
factor. The "Phase" setting as defined in the carrier table is in use.
The crest factor is minimized by internally calculating optimized car-
rier phases. The "Phase" setting displayed in the carrier table is inva-
lid.
Signal Generator Settings
Baseband
on page 370
on page 370
on page 370
97