HEADQUARTERS OH-58A - Page 162

TM 55-1520-228-10
3-36 Change 10
CONTROL/INDICATOR FUNCTION
1. FUNCTION Selector
OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power off.
TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . In this position, the major components of the Radio Set are
examined to verify their operation. Results of test are pre-
sented on front panel display.
SQ ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Receiver – On; Transmitter – Standby; Squelch – Enabled.
SQ OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Receiver – On; Transmitter – Standby; Squelch – Disabled.
RXMT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Activates retransmission mode when second FM set is
installed.
LD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . In this position, preset frequencies, time, ECCM net parame-
ters, and lockout channels may be entered.
LD-V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . In this position, TRANSEC variable is loaded into the RT.
Z-A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . When activated, all ECCM TRANSEC variables are zeroed.
STOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Completely disables all radio circuits during an extended
period of inactivity such as storage.
Figure 3-18. AN/ARC-201 Control Panel & Zeroize Switch (Sheet 1 of 2)