TM 55-1510-220-10
Figure 3-27. Transponder Control Panel (AN/APX-100)
(c)
NORM. Activates normal operating
mode.
(d)
EMER. Transmits emergency reply
code.
(6)
STATUS ANT indicator. Illuminates to
indicate the BIT or MON fault is caused by high VSWR in
antenna.
(7)
STATUS KIT indicator. Illuminates to
indicate the BIT or MON fault is caused by external
computer.
(8)
STATUS ALT indicator. Illuminates to
indicate the BIT or MON fault is caused by the altitude
digitizer.
(9)
IDENT-MIC-OUT switch. Selects source of
aircraft identification signal.
(a)
IDENT. Activates transmission of
identification pulse (IP).
(b)
MIC. Enables either control wheel
POS IDENT switch to activate transmission of ident signal
from transponder.
(c)
OUT. Disallows outgoing signal.
(10)
MODE 4 reply indicator light. Illuminates to
indicate a reply has been made to a valid Mode 4
interrogation.
(11)
MODE 4 AUDIO OUT switch. Selects
monitor mode for mode 4 operation.
(a)
AUDIO. Enables sound and sight
monitoring of mode 4 operation.
(b)
LIGHT. Enables monitoring REPLY
indicator for mode 4 operation.
(c)
OUT. Deactivates monitor mode.
(12)
MODE 3/A code selectors. Select desired
reply codes for mode 3/A operation.
(13)
MODE 1 code selectors. Select desired reply
codes for mode 1 operation.
(14)
MODE 4 TEST-ON-OUT switch. Selects test
mode of Mode 4 operation.
(a)
TEST. Activates built-in-test of mode 4
operation.
(b)
ON. Activates mode 4 operation.
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