R&S SMJ100A, Operating Manual

Page: 619 / 874

Remote Control Commands
R&S
®
SMJ100A
603 Operating Manual 1403.7458.32 ─ 14
When the cut off frequency is set as half of the output sample rate, a final lowpass filter
improves the spectrum of the clipped multicarrier signal, but may also increase the
resulting crest factor.
Parameters:
<Cutoff> float
Range:
0 to 50E6
Increment: 0.01
*RST:
50E6
Default unit: MHz
Example: BB:ARB:MCAR:CLIP:STAT ON
enables clipping
BB:ARB:MCAR:CLIP:CUT 50 MHz
sets the cut off frequency of the filter.
Manual operation: See "Filter Cut Off Frequency" on page 415
[:SOURce<hw>]:BB:ARBitrary:MCARrier:CLIPping[:STATe] <State>
Switches baseband clipping on and off.
Clipping reduces the peak power of the resulting multi carrier signal according to the
value set with the command
BB:ARB:MCAR:CLIP:CFAC
.
The resulting clipped peak power is defined by sum of the the RMS level of the unclip-
ped multi carrier signal and the input parameter Target Crest Factor. Note that clipping
reduces also the RMS level. Hence the resulting crest factor of the clipped signal is
slightly above the Target Crest Factor. In order to get the unclipped parts of the clipped
multicarrier signal matched with the unclipped multicarrier signal, the RF output power
should be reduced by the difference between resulting crest factor and Target Crest
Factor.
Parameters:
<State> 0 | 1 | OFF | ON
*RST:
0
Example: BB:ARB:MCAR:CLIP:STAT ON
enables clipping
BB:ARB:MCAR:CLIP:CFAC 37 dB
sets the target crest factor.
Manual operation: See "Clipping" on page 415
[:SOURce<hw>]:BB:ARBitrary:MCARrier:CLOad
Creates a multi carrier waveform using the current entries of the carrier table.
This multi carrier waveform is saved with the file name specified with command
SOUR:BB:ARB:MCAR:OFIL
. The file extension is
*.wv
. Digital standard "ARB" is acti-
vated, the new multi carrier waveform is loaded and is output in accordance to the trig-
ger settings.
SOURce Subsystem