(Figure 3-13 Sheet 1 of 2)
(Figure 3-13 Sheet 2 of 2)
TM 55-1520-228-10
CONTROL/INDICATOR FUNCTION
1. MASTER Control
OFF ......................................................................... Turns set OFF.
STBY ....................................................................... Places in warm-up (standby) condition.
LOW ........................................................................ Set operates at reduced receiver sensitivity.
NORM ...................................................................... Set operates at normal receiver sensitivity.
EMER ...................................................................... Transmits emergency replay signals to MODE 1, 2. or
3/A interrogations regardless of mode control settings.
2. RAD TEST-MON Switch
RAD TEST ............................................................... Enable set to reply to TEST mode interrogations. Other
functions of this switch position are classified.
MON ........................................................................ Enables the monitor test circuits.
OUT ......................................................................... Disables the RAD TEST and MON features.
3. IDENT-MIC Switch
IDENT ...................................................................... Initiates identification reply for approximately 25
........................................................................... seconds.
OUT ......................................................................... Prevents triggering of Identification reply. Spring
loaded to OUT.
MIC .......................................................................... Not used.
4. MODE 3/A Code Select Switches ................................... Selects and Indicates the MODE 3/A four-digit reply
code number.
5. MODE 1 Code Select Switches ...................................... Selects and Indicates the MODE 1 two-digit reply code
number.
206075-267-1
Figure 3-13. Transponder APX-72 Control Panel
A (Sheet 1 of 2)
3-25
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