Remote Control Commands > SOURce Subsystem > SOURce:ILS Subsystem > [:SOURce]:ILS[:GS|GSLope]:DDM:LOGarithmic
[:SOURce]:ILS[:GS|GSLope]:DDM:LOGarithmic <Logarithmic>
[:SOURce]:ILS:LOCalizer:DDM:LOGarithmic <Logarithmic>

The command enters the DDM value in dB. The dB value is calculated according to:

DDM dB = 20 × LOG [(SDM+DDM×100%) / (SDM-DDM×100%)]

A variation of the value automatically leads to a variation of the DDM value and the instrument current.

Parameters:
<Logarithmic>
float
Range: -999.9  to  999.9
Increment: 1E-4
*RST:0
Default unit: dB
Example: ILS:DDM:LOG 1

sets the difference in depth of modulation to 1 dB between the signal of the upper lobe (90 Hz) and the lower lobe (150 Hz) in ILS-GS modulation.

Options: Option R&S SMA-K25
Manual operation: See "DDM Logarithmic - ILS-LOC Modulation"

 


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