Keysight EXG and MXG X-Series Signal Generators User’s Guide 385
Using Avionics VOR/ILS Softkeys for N5171B/72B and N5181B/82B with Option 302
Using ILS Glide Slope Softkeys
Using SCPI to accomplish this, send the following command:
(:AVIonics:ILSGslope:FLY:DIRection DOWN)
...and give it the amount to fly down with a DDM of 0.4
1. Press Aux Fctn > Avionics > ILS Glide Slope
2. Press DDM/SDM
3. Press DDM
4. Enter a <value> of 0.4 and press Enter.
Using SCPI to accomplish this, send the following command:
(:AVIonics:ILSGslope:DDM 0.4)
To set the ILS Glide Slope DDM value
1. Press Aux Fctn > Avionics > ILS Glide Slope
2. Press DDM/SDM
3. Press DDM
(Default <value> is 0.0000.)
4. Select a <value> from -0.99 to 0.99 and press Enter.
Since: (-SDM/100) - (SDM/100) and SDM can be from 0% to 99%, DDM can
have a range from: -0.99 to 0.99
These softkeys set a value for the “Difference in Depth of Modulation” (DDM).
The primary mechanism which makes it possible for a pilot to obtain guidance
to a runway is the aircraft receiver's ability to detect the “Difference in Depth of
Modulation (DDM)” between this 90 Hz AM and 150 Hz AM modulation.
DDM is defined to be the “percentage modulation depth of the larger signal”
minus the “percentage modulation depth of the smaller signal”,
divided by 100.
DDM = [AM(90 Hz)% - AM(150 Hz)%] / 100
To set the ILS Glide Slope DDM value in micro-amps (uA)
1. Press Aux Fctn > Avionics > ILS Glide Slope
2. Press DDM/SDM
3. Press DDM uA
(Default <value> is 0.0 uA.)
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