Rohde & Schwarz SMAB-B92 - Page 557

Remote Control Commands
R&S
®
SMA100B
555User Manual 1178.3834.02 ─ 05
[:SOURce<hw>]:ILS[:GS|GSLope]:DDM:PCT <Pct>
Sets the difference in depth of modulation between the signal of the upper lobe (90 Hz)
and the lower lobe (150 Hz). The maximum value equals the sum of the modulation
depths of the 90 Hz and the 150 Hz tone.
See also [:SOURce<hw>]:ILS[:GS|GSLope]:DDM[:DEPTh] on page 556.
Parameters:
<Pct> float
Range: -80.0 to 80.0
Increment: 0.01
*RST: 0
Example: See Example "Configure and generate an ILS glide slope signal"
on page 542.
Manual operation: See "DDM Percent" on page 133
[:SOURce<hw>]:ILS[:GS|GSLope]:DDM:POLarity <Polarity>
Sets the polarity for DDM calculation (see [:SOURce<hw>]:ILS[:GS|GSLope]:
DDM[:DEPTh] on page 556).
The DDM depth calculation depends on the selected polarity:
●
Polarity 90 Hz - 150 Hz (default setting):
DDM = [ AM(90 Hz) - AM (150 Hz) ] / 100%
●
Polarity 150 Hz - 90 Hz:
DDM = [ AM(150 Hz) - AM (90 Hz) ] / 100%
Parameters:
<Polarity> P90_150 | P150_90
*RST: P90_150
Example: See Example "Configure and generate an ILS glide slope signal"
on page 542.
Manual operation: See "DDM Polarity" on page 131
[:SOURce<hw>]:ILS[:GS|GSLope]:DDM:STEP <DdmStep>
Sets the variation of the difference in depth of modulation via the rotary knob.
Parameters:
<DdmStep> DECimal | PREDefined
*RST: DECimal
Example: See Example "Configure and generate an ILS glide slope signal"
on page 542.
Manual operation: See "DDM Step" on page 133
SOURce Subsystem