2-10. RT/RCU CONTROLS, INDICATORS, AND CONNECTORS. Continued
ICOM AND NON-ICOM
FUNCTION SWITCH, Sets Receiver-Transmitter (RT) function. Normal operating positions are
and RXMT. Pull knob to turn to Z-A or STOW.
N O N - I C OM
OFF. Turns off primary power to the RT; HUB remains operational. In the OFF position,
SQ ON, SQ OFF,
radio draws HUB
power to maintain memory(SC and FH data) and will maintain sync time for 24 hours. Use SQ ON rather
than OFF for listening silence.
TEST. Starts self-test. Display shows results. Used during operation to check RT and remote control unit
SQ ON (squelch on). Turns on RT and squelch. Used for communication with similar radios. Prevents
rushing noise in headset.
SQ OFF (squelch off). Turns on RT but not squelch. Used for single channel (SC) communication with
radios having different squelch system.
RXMT (retransmit). Puts RT in retransmit mode. Used for retransmit operations.
LD (load). This position is used when loading preset frequencies, FH sync time, and FH data. RT func-
tions same as in SQ ON. NOTE: Do not leave switch in LD position, as memory corruption may occur.
LD-V (load variable). This position is present on Non-lCOM RT/RCU only. Used when loading Transmis-
sion Security (TRANSEC) key. RT functions same as in SQ ON. NOTE: Do not leave switch in LD-V
position, as memory corruption may occur.
Z-A (zero all). When FCTN switch is set to this position, all FH data is cleared after "GOOD" displayed.
Procedure for taking radio out of operation calls for pausing in the Z-A position until GOOD displayed
before going to the STOW position.
This ensures that the RT is completely cleared of FH data.
STOW. This Position turns off all Power to the RT including the HUB Clears all memory Used when
the radio is taken completely out of action.
l When turning FUNCTION switch into or out of stow, pause at Z-A until RT
display reads Good to ensure all stored data is cleared.
l Remember: OFF turns RT off but retains data in memory as long as power is applied.
removes all power from RT and erases all data in memory.
Z-A does not remove RT power, but erases all data in memory.
ICOM AND NON-ICOM