384 Keysight EXG and MXG X-Series Signal Generators User’s Guide
Using Avionics VOR/ILS Softkeys for N5171B/72B and N5181B/82B with Option 302
Using ILS Glide Slope Softkeys
When this formula yields a positive DDM value, the upper signal at 90 Hz is
stronger; this is indicating that the aircraft is Above the ILS Glide Slope
centerline signal and would have to Fly “Down” 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 signal at 150 Hz is
stronger; this is indicating that the aircraft is Below the ILS Glide Slope
centerline signal and would have to Fly “Up” to bring the DDM value back to
zero so that the aircraft is back in-line with the centerline of the runway.
Figure 14-26 ILS Glide Slope @ 334.70 MHz w/ Aircraft In-Line, Fly Down, Fly Up
Example:
To correct if the upper signal at 90 Hz is stronger at 0.4 DDM, the aircraft
would have to be pointed Down:
1. Press Aux Fctn > Avionics > ILS Glide Slope
2. Press DDM/SDM
3. Press Fly Up | Down
4. Press Down
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