TM 1-1520-238-10
Change 3
3-18.7
Table 3-6.
RT-1518C/ARC-164 Controls and Functions
Control
Function
Frequency/Status
Indicator
Displays individual frequency switch settings or any of the following operator prompts:
VER/OP – indicates radio is in normal operating mode.
M–LOAD –indicates radio is in MWOD load mode.
ERASE – indicates radio is in MWOD erase mode.
FMT.CHG – radio is in Frequency Management Training Change mode.
FILL – indicates a keyfill device is connected to the FILL port.
WOD OK – indicates valid WOD was received from keyfill device.
BAD – indicates bad WOD or parity was received from keyfill device.
CHAN Indicator
Channel display indicator
Preset Channel
Selector Switch
Selects one of 20 preset channels.
STATUS Switch
When depressed, an alternate display is shown on the frequency/status indicator for five
seconds.
Frequency Switches
Rotary switches that select the corresponding hundreds, tens, units, tenths, and thousandths
digits for the desired frequency in the normal mode, and the desired WOD elements or net
number in the anti–jamming mode. The A position puts the radio in to the anti–jamming
frequency–hopping mode of operation when selected.
Function Selector
Switch
Three position switch (MNL, PRESET, GRD) which selects the main transmitter and receiver
frequency. In Manual (MNL) frequency is manually selected using five rotary switches. The
PRESET position allows selection of one of twenty preset frequencies using the rotary
channel selector switch. The GRD position tunes the receiver and transmitter to emergency
frequency 243.000MHz.
SQUELCH ON/OFF
Enables and disables squelch of the main receiver.
VOL Control Knob
Rotary knob used to set receiver volume. Does not control transmitter output.
T – TONE Switch
Three position toggle switch with two position being spring loaded; the middle position being
off. When TONE is selected, a tone is transmitted on the selected frequency. When placed in
the T position, reception of the TOD is enabled for one minute.
Mode Selector
Switch
In MAIN the main receiver and transmitter are operational. In BOTH, the main receiver and
transmitter and guard receiver are operational. ADF is not used. OFF turns the radio off.
TEST DISPLAY
Switch
Lights all segments of the frequency status and channel indicators when depressed. Also
used with the T–TONE switch for emergency clock start.
Manual Squelch
(MN SQ)
Adjusts the threshold level of squelch for the main receiver.
ZERO Switch
Erases all MWOD elements when rotated to ZERO position.
FILL Port Access
FILL port access for loading MWOD segments.
Guard Squelch (GD
SQ)
Adjusts the threshold level of squelch for the guard receiver.
LOAD Button
Stores selected frequency in preset channels 1 through 20 in normal mode. In ECCM mode,
channel 20 is reserved for entry of WODs.
