R&S SMA100B - Page 605

Remote control commands
R&S
®
SMA100B
605User Manual 1178.3834.02 ─ 09
[:SOURce<hw>]:ILS[:GS|GSLope]:DDM:COUPling <Coupling>
Selects if the DDM value is fixed or is changed with a change of sum of modulation
depths (SDM, see [:SOURce<hw>]:ILS[:GS|GSLope]:SDM on page 610).
Parameters:
<Coupling> FIXed | SDM
*RST: FIXed
Example: See Example "Configure and generate an ILS glide slope signal"
on page 594.
Manual operation: See "DDM - SDM Coupling" on page 151
[:SOURce<hw>]:ILS[:GS|GSLope]:DDM:CURRent <Current>
Sets the DDM value alternatively as a current by means of the ILS indicating instru-
ment. The instrument current is calculated according to:
DDM Current µA = DDM Depth [%] × 857,125 µA
A variation of the instrument current automatically leads to a variation of the DDM
value and the DDM value in dB.
Parameters:
<Current> float
Range: -8.57125E-4 to 8.57125E-4
Increment: 1E-7
*RST: 0
Example: See Example "Configure and generate an ILS glide slope signal"
on page 594.
Manual operation: See "DDM Current" on page 150
[:SOURce<hw>]:ILS[:GS|GSLope]:DDM:DIRection <Direction>
Sets the simulation mode for the ILS glide slope modulation signal. A change of the
setting automatically changes the sign of the DDM value.
Parameters:
<Direction> UP | DOWN
UP
The 150-Hz modulation signal is predominant, the DDM value is
negative (the airplane is too low, it must climb).
DOWN
The 90-Hz modulation signal is predominant, the DDM value is
positive (the airplane is too high, it must descend).
*RST: UP
Example: See Example "Configure and generate an ILS glide slope signal"
on page 594.
SOURce subsystem