The WOD is initially entered into the preset memory and
then transferred to volatile memory. After transfer, if power
is lost or if channel 20 is selected when the function switch
is set to PRESET, it will be necessary to perform another
transfer from the preset memory to volatile memory. Start
with channel 20 and set to progressively lower channels
until a double beep is heard.
The radio will not function in the AJ mode if a WOD is not
in volatile memory. If the AJ mode is selected without en-
tering a WOD into the volatile memory, a steady warning
tone will be heard in the headset.
Time synchronization is provided by a
clock inside the radio. The internal clock is turned off when
the radio is turned off.
A TOD signal must be received to reset the radios internal
clock when the radio is turned on. This signal may be pro-
vided by another HQ radio or by an external time distribu-
tion system. Improper synchronization will prohibit proper
communication. Reception of garbled communications in
the AJ mode indicates the receiving radio and transmitting
radio are not in synchronization. In a multiple radio net,
the radio receiving all transmissions garbled is the radio
that is out of synchronization.
TOD reception can be performed in both normal and AJ
modes. The radio automatically accepts the first TOD
message after the radio is turned on and the WOD is
transferred to volatile memory. Subsequent messages are
ignored unless the T position is selected by the A-3-2-T
switch. The radio may be resynchronized by setting the
radio to the TOD transmission frequency, setting the
A-3-2-T switch to T, and requesting another person in the
common net to transmit the TOD. The radio then accepts
the next TOD update, provided the TOD update arrives
within one minute of selecting the T position on the
TOD is normally received by the main or guard receiver
via a prearranged frequency from another HQ radio which
has the desired time. When the radio receives the TOD
from an external timing source, it updates/synchronizes
the radios internal clock with the timing source. This al-
lows all radios in synchronization with the source and one
another to frequency hop simultaneously for uninterrupted
communication. Any arbitrary time may be used, but oper-
ators are encouraged to obtain and use Universal Time
Coordinated (UTC) time. The use of UTC time will allow
operators to switch from one HQ radio net to another with-
out retiming their radios to arbitrary times (TODs).
If no TOD is available from another HQ radio, an emer-
gency start of the TOD clock can be performed using the
T position of the A-3-2-T switch and the TONE button.
Emergency startup of the TOD clock generates an arbi-
trary TOD that must be transferred to other radios using
the same net. Operators using the emergency startup
method will not be able to communicate in the AJ mode
with anyone that has not received this arbitrary TOD. The
net should update to UTC time as soon as possible so ev-
eryone entering or leaving the net will not have to retime
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 fre-
quency hopping pattern, allowing for multiple radio net op-
eration 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 fre-
quency 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