RF SELECT KEYS

TM 11-6625-2975-12

2-2. CONTROLS AND INDICATORS. (CONT)

RF SELECT KEYS

RF SELECT keys are used for rf frequency selection and control of rf output level. Table 2-4 shows

individual rf select key functions.

TABLE 2-4. RF SELECT KEY FUNCTIONS

FUNCTION

KEY

Enables selection of rf carrier frequencies through DATA

RF FREQ

ENTRY keys.

Switches rf carrier frequency from selected Iocalizer frequency

LOC/GS

to paired glide slope frequency or vice versa.

∆F

Enables rf carrier frequency slewing through FAST INCR, SLOW

INCR, FAST DECR, and SLOW DECR keys.

Switches output of RF OUT connector alternately from ON to OFF.

RF ON/OFF

Increases rf output level in 10 db steps or, when A F key is

FAST INCR

enabled (lit), increases rf carrier frequency at a fast rate.

Increases rf output level in 1 db steps or, when A F key is

SLOW INCR

enabled (lit), increases rf carrier frequency at a slow rate.

Decreases rf output level in 10 db steps, or when A F key is

FAST DECR

enabled (lit), decreases rf carrier frequency at a fast

rate.

Decreases rf output level in 1 db steps or, when A F key is

SLOW DECR

enabled (lit), decreases rf carrier frequency at a slow

rate.

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