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PRE-SET, as desired.
3. Frequency selectors - Select
predesignated frequency for reception of
TOD.
or
Preset channel selector - Set to predesignated
channel.
4. Listen for net control helicopter state
STANDBY FOR TIME.
5. A-3-2-T switch Momentarily to T, then
back to A. Listen for momentary two-tone
signal followed by a single tone.
c. Entering Net Number.
NOTE
Setting the A-3-2-T switch to A overrides
the hundredths digit in both manual and
preset functions, puts the radio in AJ
mode and programs the radio to use the
net number in the three digits following
the A.
1. Function selector switch - MANUAL
or PRE-SET, as desired.
2. Frequency selectors - Set second, third
and fourth switches to the desired net
number.
or
Preset channel selector Set to a preset
channel containing the desired net
number in its second, third and fourth
digits.
3. A-3-2-T switch - A.
3.7A RADIO SET RT-1518/ARC-164 HAVEQUICK II
(HQ II) RADIO
The HQ II system consists of a modification to AN/ ARC-
164 airborne, (UHF), (AM), radio transmitter-receiver
(transceiver) set providing a frequency hopping or antijamming
capability. Frequency hopping is a technique
where the designated preset frequency being used for
communication on a given link is automatically
frequency-hopped many times per second. The purpose
of this is to make it difficult for an adversary to jam the
link since they cannot determine which channel is being
used. By the time determination is made as to which
frequency is being used, the communication link has
changed to another frequency.
The frequency-hopping scheme is implemented in the
equipment by storing or initializing every radio with a
Word of Day (WOD), Time of Day (TOD), and a net
number. The WOD programs the frequency-hopping
rate and frequency-hopping pattern. The radio cannot
function in the anti-jamming mode without a valid WOD.
Up to six WODs may be entered at one time. The
procedure for storing multiple WODs is called Multiple
Change 3 3-18.1
TM 1-1520-238-10
Word of Day (MWOD) loading. The TOD provides
synchronization necessary for communicating in the antijamming
mode by allowing frequency hopping at the
same instant in time.
The RT-1518 HQ II radio (fig. 3-6) provides an analog
display (Red Lt) for channel and frequency indicators,
and functions/operates similar to the RT-1167C/ ARC-
164 radio described in paragraph 3.7 with seven
additional features. Refer to table 3-4 for radio controls
and functions. The additional features are:
(1) Verify/Operate mode
(2) Manual Single WOD Loading
(3) Multiple WOD Manual Loading
(4) Manual WOD Erase
(5) Operational Date Loading
(6) Training/Maintenance Nets
(7) Loading/Changing FMT NETS
The HQ II Expanded Memory Board (EMB) capability is
identified on the RT-1518 radio by an EMB sticker which
appears next to the channel indicator display. If no
sticker is displayed, the Multiple Word of Day (MWOD)
must be entered to verify the HQ II radio capability.
3. 7A. 1 Antenna. The UHF-AM antenna (fig 3-1) is
located on the bottom center fuselage area and is
mounted directly aft of the Doppler fairing.
3. 7A. 2 Controls and Functions. Controls for the RT-
1518/ARC-164 are on the front panel of the unit (fig 3-6).
The function of each control is described in table 3-4.
CAUTION
The AN/ARC-164 radio must be placed
in the VERIFY/OPERATE mode before
operating in the Have Quick mode. This
will prevent the radio from locking up
and damaging the equipment.
3.7A.3 Modes of Operation.
a. Verify/Operate.
1. Mode Selector Switch - MAIN or BOTH
2. CHAN switch - Set to channel 20.
3. Frequency switches - Set to 220.000 on
the frequency/status indicator.
4. Function Selector switch - PRESET.
5. Lift access cover and press PRESET
button. The radio is now in the
VERIFY/OPERATE mode.
6. Function Selector switch - MANUAL or
PRESET
7. Select desired frequency or channel.
8. Mode Selector Switch - OFF.
Figure 3-6. Receiver-Transmitter Radio, RT-1518/ARC-164
3-18.2 Change 3
TM 1-1520-238-10
3.7A.4 Manual Single Word Of Day (SWOD) Loading.
1.
2.
3.
4.
5.
Function Selector switch - PRESET.
CHAN switch - Set to Channel 20.
Frequency switches - Set to 220.000 MHz.
PRESET button - Lift preset frequency label
cover and push PRESET button.
Frequency switches - Set to the first WOD
segment frequency (300.050) of the Training/
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