HEADQUARTERS OH-58A - Page 150

TM 55-1520-228-10
3-28
CONTROL/INDICATOR FUNCTION
1. TEST GO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indicates successful built in test (BIT).
2. TEST/MON NO GO . . . . . . . . . . . . . . . . . . . . . . . . . . Indicates unit malfunction.
3. ANT
TOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Selects antenna located on top of helicopter.
BOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Selects antenna located on bottom of helicopter.
DIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Selects both top and bottom antenna.
4. RAD TEST Switch
RAD TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enables set to reply to TEST mode interrogations.
OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disables to RAD TEST features.
5. MASTER Control
OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Turns set OFF.
STBY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Places in warmup (standby) condition.
NORM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Set operates at normal receiver sensitivity.
EMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transmits emergency replay signal to MODE 1, 2, or 3/A
interrogations regardless of mode control settings.
206075-268-1
Figure 3-14. Transponder Set Control Panel C (Sheet 1 of 2)