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TM 11-6625-2975-12
2-2. CONTROLS AND INDICATORS. (CONT)
RDL/DDM/MOD DISPLAY
RDL/DDM/MOD display provides readout of selected radials (RDL) from 000.00 to 359.99 degrees
(DEG), readout of difference in depth of modulation (DDM) in 0.001 increments, and readout of
percent modulation (MOD). In addition to the five-digit, seven-segment display, there area number
of indicators associated with the display. Their function is to indicate the type of information being
displayed. Table 2-5 shows individual indicator functions.
TABLE 2-5. RDL/DDM/MOD LED INDICATOR FUNCTIONS
FUNCTION
INDICATOR
indicates that a TO radial has been selected.
TO
Indicates that a FROM radial has been selected.
FROM
Indicates that the next DDM step will be in the up or left
U/L (150 Hz)
direction. (LOC or GS modes only.)
Indicates that the next DDM step will be in the down or right
D/R (90
Hz)
direction. (LOC or GS modes only.)
Indicates that a VOR radial has been selected.
RDL (DEG)
Indicates ILS difference in depth modulation selection and
DDM
adjustment.
Indicates selection of percent modulation function.
MOD (%)
Associated with RDl/DDM/MOD display is AUDIO STATUS display. AUDIO STATUS consists of two
indicators. Table 2-6 shows individual indicator functions.
2-6

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