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FM 24-24
Chapter 4 Single-Channel Radios
Section I. Frequency Modulated Radio Sets
AN/PRC-25 Radio Set
AN/PRC-77 Radio Set
AN/VRC-12 Series Radio Sets
AN/VRC-53, AN/VRC-64, AN/GRC-125, and AN/GRC-160 Radio Sets
AN/PRC-119(V)1, AN/VRC-87(V)2, AN/VRC-88(V)3, AN/VRC-89(V)4,
AN/VRC-90(V)5, AN/VRC-91(V)6, AN/VRC-92(V)7 SINCGARS Radio Sets
Section II. Amplitude Modulated Radio Sets
AN/GRC-106 and AN/GRC-106A Radio Sets
AN/GRC-109 Radio Set
AN/GRC-193 High Frequency Radio Set
AN/GRC-213 High Frequency Radio Set
AN/PRC-41 and AN/PRC-41A Radio Sets
AN/PRC-47 Radio Set
AN/PRC-74 Radio Set
AN/PRC-104A High Frequency Radio Set
AN/PRC-112 Multi-Transmission Transceiver
AN/PRC-112A(C) Multi-Transmission Radio with Embedded Communications
Security
AN/TRC-133A Radio Terminal Set
AN/TRQ-35(V) Tactical Frequency Sounding System
AN/VRC-24A and AN/TRC-68A Radio Sets
Section III. Auxiliary Radio Equipment
AB-903/G Mast
AN/GRA-6 Receiver-Transmitter Control Group
AN/GRA-39, AN/GRA-39A, and AN/GRA-39B Radio Set Control Groups
AN/GRA-50 Antenna Group
AN/GRA-71 Coder-Burst Transmission Group
AN/GSA-7 Radio Set Control
AT-784/PRC Loop Antenna
AT-984A/G Long-Wire Antenna
C-6709/G Control, Radio Set
KY-90 Secure Digital Net Radio Interface Unit
OE-254( )/GRC Antenna Group
OE-303 Half-Rhombic Very High Frequency Antenna
RC-292 Antenna Equipment
Page
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4-52
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4-54
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4-1
FM 24-24
Section I. Frequency Modulated Radio Sets
AN/PRC-25
Radio Set
NSN:
5820-00-857-0759
Reference: TM 11-5820-398-12
General Information
The AN/PRC-25 is a short-range, manpack, portable frequency modulated (FM)
transceiver that provides two-way voice communication. The RT-505 and RT-505A transceiver
radios are similar components. Both case modules are identical; however, the internal module
circuits of the RT-505A are micro-modularized. The modules of the two radios are physically
and electrically interchangeable. The RT-505 and the RT-505A are part of the AN/PRC-25.
They can be used as part of vehicular Radio Sets AN/VRC-53 and AN/GRC-125.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low band, 30.00 to 52.95 MHz;
High band, 53.00 to 75.95 MHz
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 to 2.0 W
Power Source . . . . . . . . . . . . . . . . . . . . . . . Batteries, dry BA-4386/U and BA-398/U
Distance Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 to 8 km (3 to 5 mi)
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AT-892 semirigid tape,
AT-271A multisection whip,
RC-292 ground plane,
OE-254
Type of Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. 30 K0F3E
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.7 kg (23.5 1b ) with battery
Limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nonsecure operation
4-2
FM 24-24
4-3
FM 24-24
AN/PRC-77
Radio Set
NSN:
5820-00-930-3724
Reference: TM 11-5820-667-12
General Information
The AN/PRC-77 is a manpack, portable FM transceiver used to provide short-range,
two-way radiotelephone voice communication. It can provide secure voice (X-mode)
transmission with the TSEC/KY-57. The radio consists of RT-841/PRC-77 transceiver and
minor comonents. The RT-841 also is used as part of Radio Sets AN/VRC-64 and
AN/GRC-160.
Technical
Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low band, 30.00 to 52.95 MHz;
High band, 53.00 to 75.95 MHz
Planning Range . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 km (5 mi)
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 4.0 W
Power Source . . . . . . . . . . . . . . . . . . . . . . . . BA-4386/U, BA-398/U or BA55984
Antenna. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AT-892/PRL-24, at 271A/PRC
multisection whip or doublet
Type of Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30K0F3E
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 10.7 kg (23.5 lb)
4-4
FM 24-24
4-5
FM 24-24
AN/VRC-12 Series
Radio Sets
NSN:
5820-00-223-7412
Reference: TM 11-5820-401-10-1
TM 11-5820-401-10-2
General Information
The radio sets in the AN/VRC-12 series are short-range, vehicular, aircraft, and fixedstation mounted units. They provide FM radiotelephone communication and can be used with
speech security or digital data equipment TSEC/KY-8, or TSEC/KY-57 by connection through
the X-mode facility of the radio sets. Transceivers RT-246 and RT-524 and Receiver R-442
make up the major components of the AN/VRC-12 series radio configuration. The RT-246 has
10 automatic presets and remote select/power capability. The RT-524 is equipped with a
built-in loudspeaker.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.00 to 52.95 (A-Band);
53.00 to 75.95 (B-Band)
Planning Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 to 41 km (5 to 25.5 mi)
Power Input . . . . . . . . . . . . . . . . . . . . Low power: 0.5 to 8 W, 25 V DC operating power;
0.5 to 10 W, 30 V DC operating power;
High power: 35 W minimum, 25 V DC operating power
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low, 8W; high, 35 W
Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . Vehicular power or Power Supply PP-2953
and Power Supply PP-665
NRI Operation . . . . . . . . . . . . . . . . . . . . . . . . Using AN/GSA-7, AN/GRA-39, or C-6709/G
Antenna -- AT-912 or AS-1729, 3.05 m (10 ft) vehicular
whip; OE-254/GRC or fixed RC-292 for installation; and
AB-15 or AB-558, 3.35 m (11 ft) whip is used with R-442/VRC
Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Detent
Squelch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Hz tone and noise
Type of Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30K0F3E
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.5 kg (56 lb), RT-246;
23 kg (51 lb), RT-524;
8.2 kg (18 lb), R-442
4-6
FM 24-24
4-7
FM 24-24
4-8
FM 24-24
4-9
FM 24-24
AN/VRC-53, AN/VRC-64, AN/GRC-125,
and AN/GRC-160
Radio Sets
NSN:
5820-00-223-7467 (AN/VRC-53)
5820-00-223-7475 (AN/VRC-64)
5820-00-223-7411 (AN/GRC-125)
5820-00-223-7473 (AN/GRC-160)
Reference TM 11-5820-498-12
General Information
The AN/VRC-53 and the AN/VRC-64 are vehicular mounted. The AN/GRC-125 and the
AN/GRC-160 can be used for vehicular and manpack operations. Both variations of the radio
sets provide short range, two way, FM radiotelephone communication between vehicles and
crew served weapons (tanks, armored personnel carriers). The radio sets are compatible with
other FM radio sets in 30.00 to 75.95 MHz range.
Technical Characteristics
Frequency Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low band, 30,00 to 52.95 MHz;
High band, 53.00 to 75.95 MHz
Power Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 to 3 W
Power Source. . . . . . . . . . . . . . . . . . . . . . . Batteries, dry BA-4386/U and BA-5598/U
Distance Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 to 8 km (3 to 5 mi)
Antenna.. .. . . . . . . . . . . . . . . . Vehicular-mounted AS-1729/VRC, manpacked
AT-892 semirigid tape, AT-271A multisection whip
Vehicular Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 V DC
Type of Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 K0F3E
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.5 kg (33.5 lb)
4-10
FM 24-24
4-11
FM 24-24
AN/PRC-119(V)1, AN/VRC-87(V)2, AN/VRC-88(V)3,
AN/VRC-89(V)4, AN/VRC-90(V)5, AN/VRC-91(V)6,
and AN/VRC-92(V)7
SINCGARS Radio Sets
NSN:
5820-01-151-9915 (AN/PRC-119( )(V)1)
5820-01-151-9916 (AN/VRC-87( )(V)2)
5820-01-151-9917 (AN/VRC-88( )(V)3)
5820-01-151-9918 (AN/VRC-89( )(’V)4)
5820-01-151-9919 (AN/VRC-90( )(V)5)
5820-01-151-9920 (AN/VRC-91( )(V)6)
5820-01-151-9921 (AN/VRC-92( )(V)7)
Reference: TM 11-5820-890-10-1
TM 11-5820-890-20-2
General Information
Single-Channel Ground and Airborne Radio Systems (SINCGARS) is a family of VHFFM radio sets designed to meet the Army’s tactical communications requirements under the
new Army operations doctrine. SINCGARS is replacing the AN/PRC-77 and the AN/VRC-12
series radio sets. It is designed for simple, quick operation using a 16-element keypad for
push-button tuning. SINCGARS is capable of short-range or long-range operation for voice,
frequency shift-keying (FSK), or digital data communications. It can be used for singlechannel operation or in a jam-resistant, frequency hopping mode which can be changed as
needed. SINCGARS has a built-in self test with visual and audio read back. Major
components and equipment configurations are shown in the chart on the following page.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 to 88 MHz
Number of Channels . . . . . . . . . . . . 2,320 (spaced every 25 kHz) includes eight channels
that can be preset for single-channel operation or
eight that can be preset for frequency hopping operation
Power Input . . . . . . . . . . . . . . . . . . . . . . 12 V DC, manpack; 28 V DC, vehicular/aircraft
Power Output . . . . . . . . . . . . . . . . . . . . . . . 5 W, and up to 50 W with power amplifier
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See the following chart
4-12
FM 24-24
4-13
FM 24-24
Section II. Amplitude Modulated Radio Sets
AN/GRC-106 and AN/GRC-106A
Radio Sets
NSN:
5820-00-402-2263 (AN/GRC-106)
5820-00-223-7548 (AN/GRC-106A)
Reference: TM 11-5820-520-10
General Information
The AN/GRC-106 is an HF-single sideband (SSB) radio set used primarily as a mobile
link in a communications network. It also may be used in fixed and semifixed applications,
and it has an AM mode to make it compatible with standard AM radio sets. The AN/GRC-106
is now being used as the basic radio set with all of the newer SSB radio teletypewriter
(RATT) configurations The AN/GRC-106 and AN/GRC-106A are identical except that the
AN/GRC-106 uses an RT-662/GRC, and the AN/GRC-106A uses an RT-834/GRC. The KY-99
is compatible with the AN/GRC-106 for secure operation.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0 to 29.999 MHz (AN/GRC-106);
2.0 to 29.9999 (AN/GRC-106A)
Ground
wave,
80
km
(50
mi) (frequency depends on
Planning Range . . . . . . . . . . . . . . . .
antenna and terrain); sky wave, 160 to 2,400 km
(100 to 1,491 mi)
Number of Channels . . . . . . . . . . . . . . . . . . . . . . . . RT-662: 28,000, spaced every 1 kHz;
RT-834: 280,000, spaced every 100 Hz
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 V DC
Power Source . . . . . . . . . . . ... . . . . Vehicle power system; to operate from 115 V AC,
Power Supply PP-4763A must be used to provide
the required 27 V DC
3K00R3E,
3K00J3E:
400
W PEP 1K10A1A,
Power Output . . . . . . . . . . . . . . . . . . . . . . . .
100HA1A: 200 W
Antenna . . . . . . . . . . . . . . . . . . . . . . 4.57 m (I5 ft) whip or doublet AN/GRA-50 Tuning,
Digital receiver also has a + 600 Hz vernier
Squelch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Noise
Security Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSEC/KY-65
Type of Service . . . . . . . . . . . . . . . . . . . . . . 3K00J3E, 3K00R3E, 1K0013A1A, 1K10A1A
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58.1 kg (128 lb)
4-14
FM 24-24
4-15
FM 24-24
AN/GRC-l09
Radio Set
NSN:
5820-00-892-0881
Reference: TM 11-5820-474-14
General Information
The AN/GRC-109 is a compact, portable high frequency (HF) radio set used for
continuous wave (CW) communications under a wide range of climatic conditions.
Transmissions can be made using the built-in hand key, an external hand key, or an external,
high-speed automatic keyer such as Coder-Burst Transmission Group AN/GRA-71. Two power
supplies and a voltage regulator permit operation from a variety of power sources. Current
tactical speech security equipment is not compatible with the AN/GRC-109; therefore, secure
voice is not a mode of operation.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . Transmit, 3 to 22 MHz; receive, 3 to 24 MHz
Planning Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 km (75mi)
Number of Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24, crystal controlled
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 to 260 V AC, 40 to 400 Hz or 6 V DC
Power Source . . . . . . . . . . . . . . . . . . . . . . . Any appropriate AC power source, generator
DC G-43/G, 6 V DC wet or dry battery
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 15 W
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . Inverted-L, length depending on the frequency
Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transmitter, crystal controlled; receiver,
crystal controlled or continuous
Squelch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . None
Type of Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transmit, 100HA1A
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.2 kg (55.5 lb)
4-16
FM 24-24
4-17
FM 24-24
AN/GRC-193
High Frequency Radio Set
NSN:
5820-01-133-4195
Reference:
11-5820-924-12
General Information
The AN/GRC-193 is a medium/high-power vehicular configuration of the Improved
High Frequency Radio (IHFR) system. It will satisfy those mission requirements which need
an HF radio capability greater than the low power/IHFR system. The high-power
vehicular/airborne adaptive configuration consists of a basic receiver-transmitter with
required coupling device, amplifier, and other ancillary devices for CW voice or teletype
operation; near vertical incidence sky wave (NVIS) antenna, whip antenna, data I/O device,
and external power sources. The radio will have the capability of selectable power (100 W,
400 W). Normal operation will be below 400 W. The AN/GRC-193 uses the KY-99 for securing
voice traffic and the TSEC/KG-84 for securing data traffic. The antenna may be remoted up
to 61 m (200 ft) from the radio set, using the antenna siting bit which is part of the basic
configuration.
Technical
Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . 2 to 29.999 MHz, 100 Hz channel separation
Planning Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,500 miles (4,023 .3 km)
Number of Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 280,000
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 V AC, 50 to 60 Hz, 24 V DC
and 26.5 V DC, vehicular
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Selectable power, 100 W, 400 W
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AT-1011, 4.88 m (16 ft) whip, doublet,
long-wire, AN/GRA-50, AS-2259 NVIS
Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic digitally controlled remote
Remote Operation . . . . . . . . . . . . . . . . . . . . . . . . . Up to 2 km (1.2 mi) using AN/GRA-39
4-18
FM 24-24
4-19
FM 24-24
AN/GRC-213
High Frequency Radio Set
NSN:
5820-01-128-3935
Reference: TM-11-5820-923-12
General Information
The AN/GRC-213 is a low-power manpack/vehicular configuration of the IHFR system.
It provides a much needed, reliable, full HF coverage capability of 2 to 29,9999 MHz to
tactical commanders. It has a requirement to pass secure, command and control information
over medium to long distances and over varying degrees of terrain features which would
normally preclude the use of very high frequency (VHF)/FM combat net radios (CNR). Use
of broadband or NVIS antennas enhances the communication capability of IHFR. The
AN/GRC-213 consists of AN/PRC-104A (complete), audio amplifier and power conditioner,
antenna switch (for use with long-wire antennas), and vehicular mounting tray to allow its
installation in Army combat vehicles (tracked and wheeled). It gives the commander a
complete low-power communications system.
Technical
Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 to 29.9999 MHz
Number of Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280,000 spaced at 100 Hz
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . Battery or 20 to 32 V DC power supply
Power Output, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20W
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Whip AN/GRA-50, AS-2259
Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic antenna tuning
Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Voice, data, CW, LSB, USB
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.6 kg (30lb)
Secure Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . KY-99, future COMSEC
4-20
FM 24-24
4-21
FM 24-24
AN/PRC-41 and AN/PRC-41A
Radio Sets
NSN:
5820-00-889-3997 (AN/PRC-41)
5820-00-104-0351 (AN/PRC-41A)
Reference: TM 11-5820-510-12 (AN/PRC-41)
TM 11-5820-510-12-1 (AN/PRC-41A)
General Information
The AN/PRC-41 is a lightweight, portable VHF/ultra high frequency (UHF)-AM
receiver-transmitter which permits manpack, fixed-station, or vehicular operation. The
AN/PRC-41 and AN/PRC-41A are identical except that the AN/PRC-41A can provide secure
voice (X-mode) operation when used in conjunction with Speech Security Equipment
TSEC/KY-38. The X-mode operation is possible due to circuitry modifications made on the
AN/PRC-41A model. The Special Cable CX-10831 is required to connect the TSEC/KY-38 to
the AN/PRC-41A. The AN/PRC-41 uses RT-695, and the AN/PRC-41A uses RT-695A.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225.0 to 399.9 MHz
Planning Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LOS
Number of Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,750, spaced every 100 kHz
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 V DC
Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . Portable BA-451/U, vehicle power system,
aircraft power system, any AC power source
(PP-3700/PRC-41 is required to convert the
AC voltage to 24 V DC) power
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3W
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AS-l404 or AS-1405
Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Detent, crystal controlled
Squelch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carrier
Type of Service . . . . . . . . . . . . . . . . . . . AN/PRC-41, 6K00A3E AN/PRC-41A, 80K0A3E
(secure or nonsecure)
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 kg (44.6 lb)
Security Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSEC/KY-38
4-22
FM 24-24
4-23
FM 24-24
AN/PRC-47
Radio Set
NSN:
5820-00-861-3539
Reference: TM 11-5820-509-12
General Information
The AN/PRC-47 is an HF-SSB radio set which provides CW and upper sideband (USB)
voice communications. It also provides FSK communication when operated with an FSK
converter. The AN/PRC-47 may be used in portable, vehicular, or fixed-station applications,
Current tactical speech security equipment is not compatible with the AN/PRC-47; therefore,
secure voice is not a mode of operation.
Technical Characteristics
Frequency Range. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0 to 11.999 MHz
Planning Range . . . . . . . . . . . . . . . Refer to short and intermediate distance ground
wave and sky wave propagation charts (FM 11-486-6)
Number of Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10,000, spaced every 1 kHz
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . 24 V DC, 26.5 V DC or 115 V AC, 400 Hz
Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BB-451/U, vehicle power system,
any appropriate AC power source
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . High, 100 W PEP; low, 20 W PEP
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AS-1320/PRC-47, whip;
AS-1321/PRC-47, long-wire vehicular whip
Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. Digital
Type of Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3K00J3E, 1K00A1A
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86.3 kg (l90 lb)
4-24
FM 24-24
4-25
FM 24-24
AN/PRC-74
Radio Set
NSN:
5820-00-912-3991 (AN/PRC-74)
5820-00-926-7282 (AN/PRC-74A)
5820-00-935-0030 (AN/PRC-74B)
5820-00-177-1641 (AN/PRC-74C)
Reference: TM 11-5820-590-12
TM 11-5820-590-12-1
General Information
The AN/PRC-74 is a low-power, transistorized, SSB radio set used for voice and CW
communications. It is designed primarily as a manpack set in areas where direct line of sight
(LOS) communications are not possible. Except for the difference in the frequency range of
the AN/PRC-74B and AN/PRC-74C, all models are essentially the same. Current tactical
speech security equipment is not compatible with the AN/PRC-74; therefore, secure voice is
not a mode of operation. Coder-Burst Transmission Group AN/GRA-71 can be used with all
lettered models.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . 2.0 to 11.999 MHz (AN/PRC-74 and AN/PRC-74A);
2.0 to 17.999 MHz (AN/PRC-74B and AN/PRC-74C)
Planning Range . . . . . . . . . . . . . . . . . . . . 40 km (25 mi) ground wave; refer to sky wave
propagation chart to determine medium range,
FM 11-486-6
Number of Channels . . . . . . . . . . . . . . . . . . . 10,000 spaced every 1 kHz (AN/PRC-74 and
AN/PRC-74A); 16,000 spaced every 1 kHz
(AN/PRC-74B and AN/PRC-74C)
10.5
to
17
V
DC,
12
to 31 V DC or 110/220 V AC
Power Input . . . . . . . . . . . . . . . . . . . . .
Power Source . . . . . . . . . . . . . . . . . . . . . Battery (BA-30, 70 each or BB-418/U, 10 each);
vehicle power system (requires PP-4514/PRC-74);
any appropriate AC power source
(requires use of PP-4514/PRC-74)
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... . . .. 15 W PEP
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AS-1887/PRC-74, slanted wire and dipole
Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Detent
Type of service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -3 K00J3E, 100HA1A
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.8 kg (41.5 lb) with dry Battery BA-4386/U,
two each; 13.4 kg (29.5 lb) with wet Battery
BB-418/U, 10 each; 22.7 kg (50 lb) with
PP-4514/PRC-74
4-26
FM 24-24
4-27
FM 24-24
AN/PRC-104A
High Frequency Radio Set
NSN:
5820-01-141-7953
Reference: TM 11-5820-919-12
General Information
The AN/PRC-104A is a low-power vehicular configuration of the IHFR system. It
provides a much needed, reliable, full HF coverage capability of 2 to 29.9999 MHz to tactical
commanders. It has a requirement to pass secure, command and control information over
medium to long distances and over varying degrees of terrain features which would normally
preclude the use of VHF/FM CNR. Use of broadband or NVIS antennas enhance the
communication capability of IHFR. The AN/PRC-104A consists of a receiver-transmitter with
up to 20 watts of power, the associated accessories (microphone, antenna, battery, backpack),
and the appropriate secure device. The AN/PRC-104A has a frequency range of 2 to 29.9999
MHz in 100 Hz steps yielding 280,000 channels and operates in the USB, lower sideband
(LSB), and CW modes. It provides the tactical commander with a complete low-power
communications system.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 to 29.999 MHz
Number of Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280,000 spaced at 100 Hz
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Battery or 20 to 32 V DC power supply
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 20 W
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AN/GRA-50, AS-2259 NVIS
Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic anteena tuning
Mode of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Voice, Data, CW, LSB, USB
Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.36 kg (14 lb)
Secure Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . KY-99
4-28
FM 24-24
4-29
FM 24-24
AN/PRC-112
Multi-Transmission Transceiver
* This radio is an over-the-counter commercial purchase obtained by the US Army.
NSN:
5820-01-279-5450
Reference: TM 11-5820-1037-13NP
General Information
The AN/PRC-112 is a technologically advanced, multi-transmission transceiver
weighing only 28 ounces and can fit in the palm of your hand. The radio acts as a
transponder, supplying ranging and personnel identification information. It also performs
beacon and air-to-ground voice functions. Combined with an interrogator equipped avionics
system, a user location can be accurately determined in range and bearing, out to 100 nm.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121.5 MHz
225 MHz to 299.975 MHz
Available Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3000 in 25 kHz steps
Frequency Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +/-5 ppm
Modulation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . AM voice AM swept-tone beacon
Transpond mode: BPSK/OOK
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Voice: any channel
Swept-tone beacon: 121.5 MHz and 243 MHz
DME transpond: any UHF channel
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ounces or 0.79 kg with battery
4-30
FM 24-24
4-31
FM 24-24
AN/PRC-112A(C)
Multi-Transmission Radio with Embedded
Communications Security
* This radio is an over-the-counter commercial purchase obtained by the US Army.
NSN:
5820-01-280-2117
Reference: Not available
General Information
The AN/PRC-112A(C) provides full voice encryption using Motorola’s field proven
INDICTOR module. Designed for covert and hostile environment operations, the AN/PRC112A(C) provides interoperability with key COMSEC devices including the Sunburst II
Processor (AN/CSZ-1A) and VINSON (KY-57). Slightly larger than the standard AN/PRC-112,
the AN/PRC-112A(C) will slip easily into uniform pockets, rucksacks and other transport
compartments. The AN/PRC-112A(C) is an NSA endorsed, Type I secure voice, ground-to-air
communications radio. A mode control switch selects between two key variables for secure
voice, a zeroize-key function and a clear “plain text” voice mode. This radio will automatically
receive and process clear “plain text” voice transmissions even when configured in a secure
voice mode. The built-in transponder beacon supplies ranging and personnel identification
information via the airborne AN/ARS-6 interrogator system.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 121.5 MHz
225 to 299,975 MHZ
Available Frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3000 in 25 kHz steps
Frequency Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +/-5 ppm
Modulation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . Secure--AM, 16 kb/s CVSD AM voice
AM swept-tone beacon
Transponder-BPSK/OOK
Operation Modes . . . . . . . . . . . . . . . . . . . . . . Secure voice--2 selectable key variables
Key variable zeroize switch Voice: clear
Sweep-tone beacon: 121.5 MHz and 243 MHz
DME transpond: any UHF channel
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36.5 ounces or 1.0 kg (with battery)
4-32
FM 24-24
4-33
FM 24-24
AN/TRC-133A
Radio Terminal Set
NSN:
5820-00-464-1616
Reference: TM 11-5820-610-14
General Information
The AN/TRC-133A is a transportable, tactical HF, nonsecure SSB radio terminal set
mounted in an S-280A type shelter. The shelter contains five radio positions which can be
connected to separate doublet antennas provided as part of the radio terminal. Positions 1
and 2 can be operated with separated 15-foot whip antennas, which are used when the radio
terminal set is needed for mobile operation and powered from the 28-volt DC vehicular
electrical system. In addition, Radio Frequency Amplifier AM-3979/FRC-93 is provided to
allow any one of the five positions to transmit on increased output power to extend the
operating range of the position so selected. Current tactical speech security equipment is not
compatible with the AN/TRC-133A; therefore, secure voice is not a mode of operation.
Technical Characteristics
Type of Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3K00J3E
(selectable USB or LSB), 100HA1A, 1K10A1A
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4 to 5.0 MHz and 6.5 to 30
MHz Planning Range . . . . . . . . . . . . . . . . . . . . . . . . . . . Ground wave, 80 km(50mi);
sky wave, see intermediate sky wave propagation chart
FM 11-486-6
Number of Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130, crystal controlled
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . 110 V AC, 60 MHz, single phase and 28 V
DC (max) for mobile mode
Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 kW, Power Supply PU-619
Power Output . . . . . . . . . . . . . . . . . . . . . . RT-718, 100 W PEP; RT-718 with AM-3979,
1,000 W PEP
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Quarter-wave whip or doublet antenna
Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous in 200 kHz bands using CK-31
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,272.2 kg (5.000 lb)
Limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nonsecure operation
4-34
FM 24-24
4-35
FM 24-24
AN/TRQ-35(V)
Tactical Frequency Sounding System
NSN:
Not available
Reference: Not available
General Information
The AN/TRQ-35(V) is an ionospheric sounding system that produces easy to
understand ionospheric propagation statistics on a real-time basis. The system is used to
minimize outages related to unpredictable changes of ionospheric characteristics and
conditions. It is intended to improve frequency management and assignments of frequencies
for HF communications systems, result in more effective and efficient use of the HF
spectrum, and produce more reliable HF communications with improved grade of service. The
AN/TRQ-35(V) system consists of the following stand-alone components.
Major Components
1 Receiver R-2081/TRQ-35(V)
1 Transmitter T-1373/TRQ-35(V)
1 Spectrum Monitor R-2093/TRQ-35(V)
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 to 30 MHz
or 2 to 16 MHz coverage after selection
Number of Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9,333
Channel Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0 kHz
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115/230 V AC + 10%, 47 to 440 Hz
Transmitted Power . . . . . . . . . . . . . . . . . . . . . . . 0.2 W and 2 W from diplexer,
+ 3 dB selectable by front panel switch;
10 W and 100 W nondiplexed output power, + 3 dB
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transmitter 113.4 kg (250 lb) in case,
Receiver 79.4 kg (175 lb) in case,
Spectrum Monitor 79.4 kg (175 lb) in case
4-36
FM 24-24
4-37
FM 24-24
AN/VRC-24A and AN/TRC-68A
Radio Sets
NSN:
5820-00-223-7413 (AN/VRC-24A)
5820-00-892-3723 (AN/TRC-68A)
Reference: TM 11-5820-222-10
General Information
The AN/VRC-24A and the AN/TRC-68A are VHF/UHF-AM radio sets used for
communications with aircraft in close support of ground operations. The AN/VRC-24A is
designed for vehicular installation, and the AN/TRC-68A is designed for fixed installation.
These radio sets will provide secure voice (X-mode) service when used in conjunction with
Speech Security Equipment TSEC/KY-99.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225.0 to 399.9 MHz
Planning Range . . . . . . . . . . . . . . . . . . . .. . . Approximately 50 km (31 mi)
with aircraft at 305 m (1,000 ft)
Number of Channels . . . . . . . . . . . . . . . . . . . . . . . . . 1,750 with a channel every 100 kHz
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 V DC or 115/230 V AC, 50 to 60 H Z
Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vehicle power system, any
appropriate AC power source
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 W
Antenna . . . . . . . . . . . . . . . . . . . . . . . . AN/VRC-24A, AT-803/VR (center-fed, broadband
vertical dipole) AN/TRC-68A, AT-197/GR
(discone with two radiator assemblages)
Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Detent
Squelch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Noise or carrier
Type of Service . . . . . . . . . . . . . . . . . . . . 6K00A3E or 30K0A3E, X-mode operation
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AN/VRC-24A, 28.1 kg (62 lb),
AN/TRC-68A, 70.4 kg (155 lb)
4-38
FM 24-24
4-39
FM 24-24
Section III. Auxiliary Radio Equipment
AB-903/G
Mast
NSN
5985-00-933-2197
Reference: TM 11-5985-263-15
General Information
The AB-903/G is a cable-driven, lightweight, telescopic mast assembly. A crank handle
attached to the winch assembly is used to raise or lower the mast. The mast raises antennas,
such as Antenna AS-1729/VRC used for the AN/VRC-122 radio series, 30 feet above ground
level. The mast may be setup on the ground or mounted on vehicles.
Technical Characteristics
Height Extended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.9 m (29 ft, 3 in)
Number of Tubular Segments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.16 kg (40lb)
4-40
FM 24-24
4-41
FM 24-24
AN/GRA-6
Receiver-Transmitter Control
NSN:
Group
5820-00-644-4554
Reference: TM 11-5820-489-34
General Information
The AN/GRA-6 provides local and remote control facilities for various push-to-talk
radio sets. The control group has the means for controlling and operating a radio set using
one or two transceiver amplifiers of the push-to-talk type from a position approximately 3.2
km (2 mi) away. The control group provides local control of the radio set through a
continuous DC circuit. It provides two-way telephone communication and ringing between
the remote and local control operators.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 to 3500 HZ
Planning Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 km (2 mi), using WD-1/TT
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V DC and 45V DC
Power Source . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . Battery BA-414/U (one each)
and BA-30 (four each)
Type of Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30K0F3E
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9 kg (17.5 lb)
4-42
FM 24-24
4-43
FM 24-24
AN/GRA-39, AN/GRA-39A, and AN/GRA-39B
Radio Set Control Groups
NSN:
5820-00-889-3860 (AN/GRA-39)
5820-00-082-3998 (A.N/GRA-39A)
5820-00-949-9909 (AN/GRA-39B)
Reference: TM 11-5820-477-12
General Information
The AN/GRA-39 is a transistorized, battery-operated remote control system. It enables
an operator to transmit and receive voice communication through a radio set from a distance
up to 3.2 km (2 mi). A push-to-talk circuit permits the radio in the system to be operated by
a local battery switchboard and the telephones connected to a local battery switchboard which
permits NRI. The difference in models is the displayed call lamp, located on the front panel;
the AN/GRA-39 model does not have this feature.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 to 3500 Hz
Planning Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 km (2 mi) using WD-1/TT
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6 to 9.0 V DC
Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Battery BA-30, six each for
C-2328 and C-2329
Type of Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30K0F3E
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.6 kg (21.25 lb)
4-44
FM 24-24
4-45
FM 24-24
AN/GRA-50
Antenna Group
NSN:
5985-00-892-0758
Reference: TM 11-5820-467-15
General Information
T h e AN/GRA-50 is a doublet antenna assembly designed to increase the
communications distance of HF radio sets when in fixed or semifixed installation. The
AN/GRA-50 can be used with any HF radio set that has the proper frequency range and a
transmitter output power of less than 500 W and an output impedance of approximately 50
ohms.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 to 30 MHz
Antenna Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Half-wave doublet
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3 kg (11.75 lb)
4-46
FM 24-24
AN/GRA-71
Coder-Burst Transmission Group
NSN:
5820-00-056-6856
Reference: TM 11-5835-224-12
General Information
The AN/GRA-71 is composed of an electromechanical Morse-code generator that
enables an operator to record messages (in Morse-code characters) on magnetic recording
tape. It has a keyer device to convert the tape-recorded Morse-code characters into equivalent
electrical impulses for keying an associated transmitter and a keyer adapter device that
contains the electronic circuitry for supplying power to the keyer unit and adapting its output
to the transmitter.
Technical Characteristics
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spring motor drive Keyer KY-468
and 6.3 V AC from transmitter to MX-4498
Power Output . . . . . . . . . . . . . . . . Electrical signals for keying transmitter for 300 wpm
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3 kg (9.5 lb)
4-47
FM 24-24
AN/GSA-7
Radio Set Control
NSN:
5820-00-543-1397
Reference: TM 11-5135-15
General Information
The AN/GSA-7 is a small, lightweight, electronic switching device used to integrate
FM radio equipment with local, push-to-talk, telephone circuits NRI. It permits the
AN/GSA-7 operator to key the transmitter, and it automatically converts a 20-Hz telephone
ringing signal to a 1600-Hz radio ringing signal and vice versa.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 to 3500Hz
Planning Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 km (10 mi), using WD-1/TT
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 to 30 V DC or 115/230 V AC, 50 to 400 Hz
Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vehicle power or AC power source
Type of Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30K0F3E
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.5 kg (27.5 lb)
4-48
FM 24-24
4-49
FM 24-24
AT-784/PRC
Loop Antenna
NSN:
5820-00-086-7651
Reference: TM 11-5985-284-15
General Information
The AT-784/PRC is a direction finder device which iS used in conjunction with FM
Radio Sets AN/PRC-77, AN/VRC-12 series, or their equivalents. It enables the operator to
determine the direction of a transmitted radio signal. The AT-784/PRC is used for reception
only.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 to 76 MHz covered in five bands
Planning Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Depends on radio set used
Weight . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 kg (2.5 lb)
4-50
FM 24-24
4-51
FM 24-24
AT-984A/G
Long-Wire Antenna
NSN:
5820-00-926-0201
Reference: TM 11-5820-398-12
General Information
The AT-984A/G is a multiple-wavelength long-wire antenna. It is used to extend the
normal transmission and reception range of radio sets equipped with Receiver-Transmitters
RT-505/PRC-25 and RT-841/PRC-77.
Technical Characteristics
Frequency Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 to 76 MHz
Planning Range. . . . . . . . . . . . . . . . . . . . . . . 19 km (12 mi), long-wire to whip antenna;
28 km (17 mi), long-wire to long-wire antenna
Weight. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 kg (10 lb)
4-52
FM 24-24
C-6709/G
Control, Radio
NSN:
Set
5820-00-930-3597
Reference: TM 11-5820-615-12
General Information
The C-6709/G is a single channel, solid-state NRI. The operator at the C-6709/G
receives requests either from the radio link or the switchboard and establishes the
interconnection. The C-6709/G can be used with automatic switchboards such as the
AN/TTC-41(V), enabling a DTMF telephone subscriber to key and unkey the radio using the
key sender on the telephone.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 to 7000 Hz
Planning Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 km (2.5 mi)
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 to 30V DC
Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vehicle power
Type of Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30K0F3E
4-53
FM 24-24
KY-90
Secure Digital Net Radio Interface Unit
NSN:
5895-01-166-3931
Reference: TB 11-5820 -890-10-7
General Information
The secure digital net radio interface unit (SDNRIU) will permit calls between singlechannel radios and telephone subscribers using either existing or programmed equipment.
The SDNRIU is a replacement for the AN/GSA-7 presently used as an NRI unit.
Technical Characteristics
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Half-duplex to full-duplex converters
signaling equipment with COMSEC
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . 40 lb (18 kg)
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Shelter and Vehicle
4-54
FM 24-24
OE-254()/GRC
Antenna Group
NSN:
5985-01-063-1574
Reference: TM 11-5985-357-13
General Information
The OE-254 is a general purpose, stationary, broadband, omnidirectional antenna used
to extend the range of tactical FM radio sets. Under normal field conditions, the antenna will
be mast mounted. Once installed, the OE-254 does not have to be taken down for adjustment
when a new frequency band is assigned to the radio net.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 to 88MHz
Planning Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57.9 km (36 mi), average terrain;
48.3 km (30 mi), difficult terrain
RF Power Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 W nominal
Antenna Erection Time (one person . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 minutes
Height Erected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.8 m (42 ft)
Input Impedance to Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 ohms
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.4 kg (45 lb)
4-55
FM 24-24
4-56
FM 24-24
OE-303
Half-Rhombic Very High Frequency Antenna
NSN:
5985-01-152-5845
Reference: TM 11-5985-370-12
General Information
The OE-303 is a high gain, lightweight, directional antenna that can operate over the
frequency range of 30 to 88 MHz without having to be physically tuned by the operator. The
antenna and all the ancillary equipment (guys, stakes, tools, mast sections, compass) are
contained in two carrying bags for manpack or vehicular transportation. The antenna is
oriented in the direction of desired transmission by using a compass and the appropriate map
sheet as required. The Mast Assembly AB-1244 is the primary antenna support structure
used with the Half-Rhombic VHF Antenna OE-303. Connections to the antenna and radio
sets are made with connectors and cables provided with the antenna.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 to 88 MHz
Antenna Erection Time (two people) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 minutes
Height Erected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.1 m (30ft)
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.4 kg (45 lb)
4-57
FM 24-24
4-58
FM 24-24
RC-292
Antenna Equipment
NSN:
5985-00-497-8554
Reference: TM 11-5820-348-15
General Information
The RC-292 is a general purpose, stationary, ground-plane antenna used to increase
the transmission/reception range of tactical FM radio sets. The radiating and ground plane
elements must be adjusted to the proper length for a particular operating frequency.
Technical Characteristics
Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 to 76 MHz
Planning Range . . . . . . . . . . . . . . . . . . . . . . . Approximately twice the planning
range of a radio set using a
quarter-wave whip antenna
Height Erected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.28 to 12.56 m (37 to 41.2 ft)
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Approximately 19.5 kg (43 lb)
4-59
FM 24-24
4-60

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