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OPERATING CONTROLS AND INDICATORS.
Up
TM-11-5841-268-25 Control Transponder Set C-6280(P)/APX C-6280A(P)/APX C-67171APX & C-7483/APX Manual
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SECTION III. TEST EQUIPMENT AND SPECIAL TOOLS


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.
A
Enables transponder system to respond to Code B interrogations.
B
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.
ON
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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