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Mode Selector In MAIN the main receiver and transmitter are operational. In BOTH, the main
Switch receiver and transmitter and guard receiver are operational. ADF is not used. OFF
turns the radio off.
TEST DISPLAY Lights all segments of the frequency status and channel indicators when depressed. Also
Switch used with the T-TONE switch for emergency clock start.
Manual Squelch Adjusts the threshold level of squelch for the main receiver.
(MN SQ)
ZERO Switch Erases all MWOD elements when rotated to ZERO position.
FILL Port Access FILL port access for loading MWOD segments.
Guard Squelch (GD Adjusts the threshold level of squelch for the guard receiver.
SQ)
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.
Change 3 3-18.7
TM 1-1520-238-10
c. HaveQuick (HQ) Operation. The HQ mode of
operation provides a jam resistant capability by means of
a frequency hopping technique that changes frequency
many times per second. Automatic frequency changing
in an apparently random manner provides the jam resistance
of the radio. The HQ radios permit communication
in radio-jamming environments. Three elements
are required for uninterrupted, successful
communication. Radios must use the word-of-day
(WOD), be time-synchronized with each other with a
time-of-day (TOD), and share a common net.
(1) Word Of Day (WOD). The WOD programs the
frequency hopping rate and frequency hopping
pattern. The radio cannot function in the antijamming
mode without a valid WOD The WOD
does not take up preset memory, but the WOD
memory is accessed through preset locations 20
through 15. The seventh location, accessed
through channel 14, stores the Day of the Month
information. This date code works in conjunction
with the TOD and specifies the day a specific
WOD is to be utilized when Multiple Word of Day
(MWOD) are entered. At midnight (GMT)
transitions, the radio automatically generates a
new frequency hopping pattern based on the
new days WOD. Up to six WODs may be
entered at one time, allowing for multiple day use
of the radio set without installing another WOD.
(2) Time Of Day (TOD). Time synchronization is
necessary for communicating in the antijamming
mode to allow frequency hopping at the
same instant in time. TOD information is
obtained from the UHF radios that have been
modified to receive the Universal Time Coordinated
(UTC) signal. UTC is a worldwide
standard and is available from a variety of
sources, such as the Command Post, Global
Positioning System (GPS), and AWACS. A valid
TOD signal will be heard as a two-beat
frequency tone. Once all radios are operating on
UTC, uninterrupted voice communications are
insured. The radio automatically accepts the
first TOD signal after power up. The first
reception must occur in the normal mode. Updates
of the TOD may be performed in the antijamming
or normal mode. Subsequent TOD
transmissions are ignored unless the operator
enables the radio to receive a new TOD. If
communications during anti-jamming operations
become slightly garbled it is an indication of drift
in TOD synchronization...
d. HaveQuick II Command Codes. There are four
separate Command Code functions associated with
loading the HaveQuick II radio. The operator enters a
six digit command code into preset 20 to begin the
unique initialization procedure. The Command Codes,
their function and Frequency/Status indication are shown
in table 3-7.
Table 3-7. HAVEQUICK II Command Codes
Command Code Function Frequency/
Status Indication
220.000 Verify/Operate VER/OP
220.025 MWOD Load M-LOAD
220.050 MWOD Erase ERASE
220.075 FMT.CHG Fre- FMT.CHG
quency
3.7B.4 Manual Single Word Of Day (SWOD) Loading.
NOTE
The below procedures step through
entering the Training/Maintenance WOD
for performing checks and maintenance.
An actual WOD may be entered as a
substitute in the below steps.
1. Function Selector switch - PRESET.
2. CHAN Switch - Set to Channel 20.
3. Frequency Switches - Set to 220.000 MHz.
4. LOAD Button - Lift preset frequency label
cover and push LOAD button. To check
that radio is in the VER/OP mode, press
the STATUS button and the
frequency/status LCD should display
VER/OP for five seconds.
5. Frequency Switches - Set to the first WOD
segment frequency (300.050) of the
Training/ Maintenance WOD listed in table
3-8.
Table 3-8. Training/Maintenance WOD and
Common Net
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