c. HaveQuick (HQ) Operation. The HQ mode of op-
eration 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 resist-
ance of the radio. The HQ radios permit communication in
radio-jamming environments. Three elements are re-
quired for uninterrupted, successful communication. Ra-
dios must use the word-of-day (WOD), be time-synchro-
nized 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 anti
jamming 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) transi-
tions, 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 ra-
dio set without installing another WOD.
(2) Time Of Day (TOD).
Time synchronization is
necessary for communicating in the antijam-
ming mode to allow frequency hopping at the
same instant in time. TOD information is ob-
tained from the UHF radios that have been mod-
ified 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 twobeat 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 per-
formed in the antijamming or normal mode.
Subsequent TOD transmissions are ignored un-
less the operator enables the radio to receive a
new TOD. If communications during antijam-
ming 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 load-
ing the HaveQuick II radio. The operator enters a six digit
command code into preset 20 to begin the unique initiali-
zation procedure. The Command Codes, their function
and Frequency/Status indication are shown in table 3-7.
HAVEQUICK II Command Codes
3.7B.4 Manual Single Word Of Day (SWOD) Loading.
The below procedures step through enter-
ing the Training/Maintenance WOD for per-
forming checks and maintenance. An actual
WOD may be entered as a substitute in the
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 seg-
ment frequency (300.050) of the Training/Main-
tenance WOD listed in table 3-8.
Training/Maintenance WOD and