TABLE 1-1. OPERATING CONTROLS AND INDICATORS

T.O. 12P4-2APX-142

NAVAIR 16-35C6280-1

TM 11-5841-268-25

TABLE 1-1. OPERATING CONTROLS AND INDICATORSContinued

FUNCTION

CONTROL OR INDICATOR

Selects test signals: RAD TEST position permits transponder set to be interro-

RAD TEST-OUT-MON Switch

gated by selected Mode signals from an AN/APM-l23(V)( ) or similar equipment;

MON position turns on the monitoring circuits of Transponder Test Set

TS-1843( )/APX; OUT position disables test circuits.

Lamp lights when transponder set responds properly to Mode 1, 2, 3/A, or C test

TEST Light

signal.

MODE 4 CODE Switch

Selects type of Mode 4 operation:

When held in position, overrides zeroizing function and enables

HOLD

transponder computer to retain Mode 4 code settings when AC

power is removed. When released, returns to A position.

Enables transponder system to respond to Code A interrogations.

Enables transponder system to respond to Code B interrogations.

Cancels (zeroizes) Mode 4 code settings from transponder com-

ZERO

puter provided other operational requirements are met.

Enables transponder system to reply to Mode 4 interrogations.

MODE 4 ON-OUT Switch

Disables Mode 4 operation.

OUT

Selects Mode 4 monitoring method:

MODE 4 AUDIO-OUT-LIGHT Switch

AUDIO

Enables aural monitoring (short burst 300 to 400 cycle buzz) of

Mode 4 interrogations (valid or invalid) and REPLY light moni-

toring of Mode 4 replies.

Enables only REPLY light monitoring of Mode 4 replies.

LIGHT

OUT

Disables aural and REPLY light monitoring.

Lights to indicate valid Mode 4 replies when MODE 4 AUDIO-LIGHT-OUT

MODE 4 REPLY Light

switch is set to either AUDIO or LIGHT.

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