Keysight EXG and MXG X-Series Signal Generators User’s Guide 371
Using Avionics VOR/ILS Softkeys for N5171B/72B and N5181B/82B with Option 302
Using ILS Localizer Softkeys
To set the ILS Localizer DDM value as a percentage (%)
1. Press Aux Fctn > Avionics > ILS Localizer
2. Press DDM/SDM
3. Press DDM%
(Default <value> is 0.00%.)
4. Select a <value> from 0 - 99% and press Enter.
These softkeys set a value for the difference in depth of modulation (DDM)
in %. DDM can be expressed either in terms of percentage (%) or as a
modulation index. A DDM of 1% is equivalent to 0.001 DDM.
To set the ILS Localizer SDM value
1. Press Aux Fctn > Avionics > ILS Localizer
2. Press DDM/SDM
3. Press SDM
(Default <value> is 40.00%.)
4. Select a <value> from 0 - 99% and press Enter.
These softkeys set the sum of depth of modulation (SDM):
SDM = [AM(90 Hz) + AM(150 Hz)] / 100