FUNCTION/CONTROL KEYS

TM 11-6625-2975-12

2-2. CONTROLS AND INDICATORS. (CONT)

FUNCTION/CONTROL KEYS

FUNCTION/CONTROL keys control information displayed in RDL/DDM/MOD and AUDIO STATUS

displays. Table 2-2 shows individual function/control key functions.

TABLE 2-2. FUNCTION/CONTROL KEY FUNCTIONS

FUNCTION

KEY

Allows selection of percent modulation through DATA ENTRY keys

% MOD

and switches RDL/DDM/MOD display to indicate percent

modulation.

Switches RDL/DDM/MOD and AUDIO STATUS displays back to the

STD

preset condition for the selected mode.

Enables selection of radial in VOR mode or DDM in ILS mode

RDL/DDM

through DATA ENTRY keys.

STEP ∆ RDL ∆ DDM

Steps VOR radial in + 30-degree steps or ILS DDM in standard DDM

steps.

Selects either a FROM or TO radial in VOR mode, or a 90 Hz

T/F U/L D/R

predominant or 150 Hz predominant signal in ILS mode.

∆ ILS PH

When enabled, a phase shift equivalent to 60 degrees of the

150 Hz component is introduced, as measured between posi-

tive-going zero crossings of the 90 Hz and 150 Hz components

of the ILS composite waveform.

Steps VOR mode radial in + 10-degree steps.

Slews VOR mode radial in + 0.01-degree steps, LOC mode DDM

in 0.001 (left) steps, or GS mode DDM in 0.002 (up) steps.

Steps VOR mode radial in -10-degree steps.

Slews VOR mode radial in -0.01-degree steps, LOC mode DDM

in 0.001 (right) steps, or GS mode DDM in 0.002 (down) steps.

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