TM 43-6625-916-12
RADAR TEST SET
0006 00
OPERATION UNDER USUAL CONDITIONS - Continued
f.
Start TS-4530 scenarios.
g. Perform interrogator (manual or automatic) tests on the TCAS unit.
h. Perform interrogator sensitivity.
This chart is intended to aid the operator if faults are observed during testing of an interrogator or
transponder.
The Platform Testing Problem Chart (Table 6-11) is not intended to represent all common faults/causes in the
system under test. It is a general starting place for fault determination and correction.
Indicated Fault
Possible Cause
Action
FAULT=ANGLE
Signal reflections
Change relative Aircraft/Weapons System/Test
Set positions. Relocate aircraft away from hangar
walls or other large reflective surfaces if needed.
No Replies or Low Replies
Signal reflections or Test
Check Test Set aiming and/or change test
Set aiming; inoperative
position. Check for energized IFF; re-check using
IFF
direct connect mode of testing.
ISLS Fault
IFF ISLS problem
Recheck using direct connect mode of testing.
Replace IFF LRU if needed.
Incorrect
distance
Incorrect Setup
May be due to incorrect distance entered into
displayed (radiated test)
setup. Operator must be correct distance from
aircraft antenna.
Low power transmitter
Transmit Power (radiated
Perform direct connect mode of testing to
test)
measure actual transmitter power. Replace IFF
Incorrect setup
LRU if direct connect test fails or inspect and test
Incorrect distance
antenna system if direct connect mode of testing
okay. May be due to incorrect distance entered
into setup. Operator must be correct distance
from aircraft antenna.
Poor RX sensitivity
Receiver
Sensitivity
Perform direct connect mode of testing to
(radiated test)
measure actual receiver MTL. Replace IFF LRU if
Incorrect setup
direct connect mode of testing fails or inspect and
Incorrect distance
test antenna system if direct connect mode of
testing ok. May be due to incorrect distance
entered into setup. Operator must be correct
distance from aircraft/weapons System antenna.
Pulse Timing
IFF fault
Replace IFF LRU
Transmit Frequency
IFF fault
Replace IFF LRU
Transmit Power (direct
IFF fault
Replace IFF LRU
connect test)
Receiver
MTL
(direct
IFF fault
Replace IFF LRU
connect test)
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