Keysight EXG and MXG X-Series Signal Generators User’s Guide 369
Using Avionics VOR/ILS Softkeys for N5171B/72B and N5181B/82B with Option 302
Using ILS Localizer Softkeys
When this formula yields a positive DDM value, the left signal at 90 Hz is
stronger; this is indicating that the aircraft is to the Left of the ILS Localizer
centerline signal and would have to Fly “Right” to bring the DDM value back to
zero so that the aircraft is back in-line with the centerline of the runway.
When this formula yields a negative DDM value, the right signal at 150 Hz is
stronger; this is indicating that the aircraft is to the Right of the ILS Localizer
centerline signal and would have to Fly “Left” to bring the DDM value back to
zero so that the aircraft is back in-line with the centerline of the runway.
Figure 14-17 ILS Localizer @ 108.10 MHz w/ Aircraft In-Line, Fly Left, Fly Right
Example:
To correct if the left signal at 90 Hz is stronger at 0.2 DDM,
the aircraft would have to be pointed Right
(:AVIonics:ILSLocalizer:FLY:DIRection RIGHt)
with a DDM of 0.2
(:AVIonics:ILSLocalizer:DDM 0.2)
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