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switch mounted in moveable
floor mat.
Off Released position; disables microphone.
On Depressed position; enables
microphone.
Figure 3-2-2. Interphone Control (C-6533/ARC)
3-2-3. Antenna System.
Antennas used for avionics communications and electronic
systems equipment are shown in figure 3-2-3. This
figure shows the maximum antenna configuration. All
antennas illustrated may not appear on all helicopters.
3-2-4. UHF-AM Have Quick II Radio (AN/ARC-164).
The UHF Have Quick II (HQ II) radio (AN/ARC-164) is
located on the center console. It is capable of providing
normal and ECCM, Anti-Jam (AJ) two-way voice communications
in the band from 225.000 to 399.975 MHz in
25 kHz increments. The HQ II is capable of operating with
the Basic HAVE QUICK radio. It also provides 20 preset
frequencies and will monitor and transmit on a permanent
guard channel (243.000 MHz). When in the AJ
mode preset 20 is restricted to AJ operations. The usual
operating mode for the radio set is the normal mode
where the radio uses 1 of 7,000 frequencies. Power for
the UHF-AM Have Quick II radio set is supplied by the 28
volt essential bus through the COMM UHF AM circuit
breaker on the No. 1 PDP.
There are presently three configurations of the AN/ARC
164-UHF/AM radio. The following paragraphs identify
the visual differences in their configurations.
a. AN/ARC-164, UHF/AM Basic (not modified for
Have Quick) 100MHz selector for the hundreds digit only
has a 2 and a 3 position.
b. AN/ARC-164 UHF/AM Have Quick I (capable of
single WOD entry only). Has a four position selector for
the hundreds digit, A, 2. 3, and T. Does not have EMB
label adjacent to the Pre-set channel selector.
c. AN/ARC-164 UHF/AM Have Quick II. Same as b.
above, but includes EMB label adjacent to the Pre-set
channel selector.
Reverse compatible communications between HQ II and
HQ I radios in the AJ mode, is accomplished by either,
entering a single WOD or selecting the appropriate
MWOD and net number with a suffix 00.
3-2-5. Anti-Jam Mode.
The AJ mode uses a frequency hopping scheme to
change the frequency many times per second. this
makes it difficult for the enemy to jam the frequencies
since knowledge of the frequencies being used by the
pilot are unavailable. Because the particular frequency
used at any instant depends on the precise time-of-day
(TOD), all participating UHF-AM Have Quick II radios
must have clocks which are synchronized. In addition, all
participating radios must have the same word-of-day
(WOD) and net number data when in the AJ mode.
TM 1-1520-240-10
3-2-4
3-2-6. Word-of-Day.
The WOD programs the frequency hopping rate and pattern.
Without it, the radio cannot function in the AJ mode.
A WOD is made up of a maximum of six WOD segments
plus a date code. The Have Quick II radios are capable
of storing up to six WODs, thus allowing for multi-day use
of the radio set. This technique is known as multiple
word-of-day (MWOD) loading. The basic have QUICK
radio allows loading a single WOD, in volatile memory.
Four operating modes are used within the radio set to
initiate various Have Quick (HQ) programing functions.
They are accessed via preset 20 with the frequencies
listed in Table 3-2-1. The functions are Operate/verify,
MWOD load, MWOD erase, and Frequency Managed
Training (FMT) frequency load.
1. Glide slope
2. Radar warning
3. HF ARC-220 antenna
4. VHF navigation
5. Radar warning
6. IFF
7. ECM antennas
8. Marker beacon
9. ADF loop and sense antennas
10. UHF -AM
11. VHF AM/FM (typical top and bottom)
12. FM homing
13. Doppler navigation
14. Radar warning blade antenna
15. Radar altimeter
Figure 3-2-3. Antenna Locations
TM 1-1520-240-10
3-2-5
Table 3-2-1. Have Quick II Additional Functions
Frequency and Use
FUNCTION FREQUENCY USE
Operate/verify 220.000 Places the radio in
the normal operating
mode and provides
for the verification
of an
MWOD
logged for entered
date code.
MWOD load 220.025 Enables the loading
of MWOD’s.
MWOD Erase 220.050 Enables the pilot
to completely
erase the nonvolatile
memory containing
the
MWOD’s.
FMT frequency
load
220.075 Enables the loading
of training frequencies.
MWOD data is stored in nonvolatile memory within the
radio set. Seven memory locations are available for each
MWOD with the capability of storing a maximum of six
MWODs within the radio set. The channel selectors, the
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