HEADQUARTERS OH-58A - Page 151

TM 55-1520-228-10
CONTROL/INDICATOR FUNCTION
6. STATUS Indicators.
ANT ......................................................................... Indicates that built in test (BIT) or monitor (MON) failure
is due to high voltage standing wave ratio (VSWR) in
antenna.
KIT ........................................................................... Indicates that built in test (BIT) or monitor (MON) failure
is due to external computer.
ALT Indicates that built in test (BIT) or monitor (MON) failure
is due to altitude digitizer.
7. IDENT-MIC Switch
IDENT ...................................................................... Initiates identification reply for approximately 25
seconds.
OUT ......................................................................... Prevents triggering of identification reply. Spring
loaded to OUT.
MIC .......................................................................... Not used.
8. MODE 3/A Code Select Switches ................................... Selects and indicates the MODE 3/A four-digit reply
code number.
9. MODE 2 Code Select Switches ...................................... Selects and indicates the MODE 2 four-digit reply code
number.
10. MODE 1 Code Select Switches .................................... Selects and indicates the MODE 1 two-digit reply code
number.
11. CODE CONTROL ........................................................ Holds, zeroizes, or changes MODE 4 code.
12. MODE 4/TEST Switch
TEST ....................................................................... Selects MODE 4 BIT operation.
ON ........................................................................... Selects MODE 4 ON operation.
OUT ......................................................................... Disables MODE 4 operation.
13. MODE 4 AUDIO/LIGHT Control
AUDIO ...................................................................... MODE 4 is monitored by audio.
LIGHT ...................................................................... MODE 4 is monitored by a light.
OUT ......................................................................... MODE 4 not monitored.
14. MODE 4/REPLY........................................................... Indicates that a MODE 4 REPLY is generated.
15. TEST/TEST/M-1
TEST/ON/OUT ......................................................... Selects ON, OFF, or BIT of MODE 1 operation.
16. TEST/M-2
TEST/ON/OUT ......................................................... Selects ON, OFF, or BIT of MODE 2 operation.
17. TEST/M-3/A
TEST/ON/OUT ......................................................... Selects ON, OFF, or BIT of MODE 31A operation.
18. TEST/M-C
TEST/ON/OUT ......................................................... Selects ON, OFF, or BIT of MODE C operation.
Figure 3-14. Transponder Set Control Panel
C
(Sheet 2 of 2)
Change 10 3-29