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not have to retime their radios.
The TOD can be transferred in both normal and AJ
mode by momentarily pressing the TONE button with
the A-3-2-T switch set to T. A TOD transmission allows
a time update if one radio has drifted out of synchronization.
(3) Common Net Numbers. In the AJ mode, a
communications channel is defined by a net number
instead of a signal frequency as in the normal mode.
After WOD and TOD are entered, any valid AJ net
number can be selected by using the frequency selector
switches. The net number programs the entry point in
the WOD frequency hopping pattern, allowing for multiple
radio net operation using a common WOD and
TOD.
f. Anti-Jamming Mode Operation. The A position
of the A-3-2-T switch overrides the hundreds digit
in both manual and preset modes. The A cannot be inserted
into the preset channel memory. It will be displayed
as a 3 on the frequency indicator, and accepted
as a 3 if inserted in a preset channel. If the next three
digits of a frequency in a preset channel are the same as
the desired net number, the preset channel can be used
in the AJ mode.
The radio will function in the AJ mode when a WOD
and TOD are programmed into the radio, A is set on the
A-3-2-T switch, and MANUAL is selected on the function
switch with an appropriate net number in the
three frequency digits following the A. If the function
switch is set to BOTH and the AJ mode is selected, any
transmission on the guard channel takes precedence
over the AJ mode.
TM 1-1520-238-10
3.7.4 Warning Tones.
a. A steady warning tone will be heard in the headset
when the AJ mode is selected and TOD, or a valid
WOD, has not been entered.
b. A pulsating warning tone will be heard in the
headset when an invalid operating net is selected.
3.7.5 Conference Capability.
NOTE
Conference communication is not possible
when operating in the secure voice mode.
In the AJ mode, the radio can receive and process two
simultaneous transmissions on the same net. This conference
capability is available by selecting 00, 50, or 75
with frequency selector 5 and then operating in the AJ
mode. Conferencing is not possible when the net number
ends in 25.
In a conference net, the second transmitting radio will
automatically shift its transmission frequency by 25
kHz when it monitors a transmission on the primary
net frequency. The wide band receiver will read both
transmissions without the interference normally
associated with two radios transmitting on the same
frequency simultaneously. Three simultaneous transmission
will result in garbled reception.
3.7.6 Guard Operation.
NOTE
If the guard frequency is being jammed
with the mode selector switch in the
BOTH position and the radio in the AJ or
normal mode, set the mode selector switch
to MAIN.
The guard receiver is not affected by AJ mode operation.
The guard frequency maybe monitored regardless
of mode as long as the mode selector switch is set to
BOTH. The BOTH position turns on the main transceiver
and guard receiver. The guard receiver will remain
tuned to 243.000 MHz regardless of manual or
preset frequencies selected. When the function selector
switch is set to GUARD, the AJ mode is removed, the
guard receiver is turned off and the main transceiver is
set at 243.00 MHz, making it possible to transmit and
receive on the guard frequency.
3.7.7 Secure Communication. The HQ radio has a
secure (cipher) communication capability. In either the
normal or AJ mode, the radio can perform cipher mode
operation. The effectiveness of communications in the
AJ cipher mode depends on the frequency hop rate. It is
recommended that the slowest hop rate (channel 20
WOD set at 00) be used during AJ cipher mode operation.
3.7.8 Normal Mode Operating Procedures.
a. Loading Preset Channels.
1. Mode selector switch - MAIN or BOTH.
2. Frequency selectors - Select frequency to be
set in memory.
3. Function selector switch - PRESET.
NOTE
For HQ radios, do not select channel 20.
4.
5.
6.
7.
8.
Preset channel selector - Set to channel to be
loaded.
Open the switching unit cover.
PRESET button - Press. The frequency is
now loaded into memory.
Repeat steps 2, 3, 4 and 6 to complete presetting
channels.
Close and latch switching unit cover.
b. Transmit/Receive (MAIN) Operating Procedures.
1.
2.
3.
4.
Mode selector switch - MAIN.
Function selector switch - MANUAL.
To manually select a frequency, set the five
　
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