LOCALIZE/GLIDE SLOPE DDM SELECTION AND ADJUSTMENT (cont)

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2-4. OPERATING PROCEDURES. (CONT)

7. Press STEP D RDL D DDM key until RDL/DDM/MOD display indicates next step listed in

NOTE

Each time STEP D RDL D DDM key is pressed, test set switches to a new DDM step value

until .000 is reached. Pressing STEP D RDL D DDM key again will repeat procedure.

Holding STEP D RDL D DDM key depressed does not provide continuous step increases.

8. Repeat step 7 for each STD DDM step listed in table 2-12 until .000 is indicated by

RDL/DDM/MOD display.

EL9LX041

NOTE

Each change of DDM step requires pressing STEP D RDL D DDM key. DDM will step In

U/L (150 Hz) direction unless D/R (90 Hz) indicator is lit. If D/R (90 Hz) indicator is lit,

DDM steps in D/R (90 Hz) direction until maximum deviation is reached, and next step

returns DDM to .000 or beam center. At beam center, DDM returns to U/L (150 Hz)

signal and indication and remains in U/L (150 Hz) condition until D/R (90 Hz) is again

selected.

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