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Chapter 1. GENERAL INFORMATION - TM-11-5820-919-120021
Up
TM-11-5820-919-12 Radio Set AN/PRC-104(A) (NSN
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Figure 1-1. Radio Set AN/PRC-104 Equipment Supplied (Sheet 1 of 2)


TM 11-5820-919-12
antenna will be adequate for most short range
1-7. The control panel has been human-engineered for
requirements (less than 10 miles).
Two standard
ease of operation making it possible to adjust all controls
input/output devices come with the radio set: Handset H-
even while wearing heavy gloves. Unlike older similar
189/GR (handset) and Telegraph Key KY-872/ PRC-104.
radio sets, there are no front panel meters or indicator
These are attached to either of the two AUDIO
lights on the AN/PRC-104. All functions which formerly
connectors on the receiver/exciter. The radio transmitter
required these types of indicators antenna tuning, battery
(exciter) is enabled (keyed) by the handset push-to-talk
condition, etc.) are monitored by the radio itself and
(PTT) button or depressing the telegraph key to contact.
communicated to the operator as special tones in the
The receiver is operative only when the transmitter
handset.  This feature is particularly, useful during
disabled, therefore, communication is on a one-wav
tactical black-out operations. The superior design and
reversible (half duplex) basis. The radio set with whip
innovative features of the AN/PRC-104 radio set now
and handset weighs 15.7 pounds.
make it possible to maintain  a reliable long-range
communications  link  using  lightweight,  portable
equipment that can be operated by personnel with a
1-11.  Battery Pack.  The radio set operates from a
minimum of training.
nominal 28-volt dc battery pack, with acceptable voltage
input between 20 and 32 vdc. The battery pack consists
1-8. RELATIONSHIP OF AN/PRC-104 EQUIPMENTS
of 16 silver-zinc storage battery cells, inside the battery
case. It is normally latched to the other two units, but
(Figures 1-1 and 1-2).
may also be connected to the amplifier/coupler via the 3-
foot Electrical Power Cable Assembly CX-13031/PRC-
1-9. Radio Set. The Radio Set AN/PRC-104 (radio set)
f04 (battery extender cable). This connection permits the
consists of three units. low-power Receiver Transmitter
battery pack to be carried by the operator under the
RT-1209/URC
(receiver/exciter),
20watt
Radio
protection of cold weather clothing to extend battery
Amplifier
AM-6874/PRC-104
operating life.
Normal life of the battery pack is
(amplifier/coupler), and Battery Case CY-7875/PRC104
approximately 16 hours of operation, assuming 10
(battery pack).  Quick-disconnect latches secure the
percent transmit time.  The silver-zinc battery pack is
receiver/exciter to the amplifier/coupler, and each Is
charged using Battery Charger PP-6241/t' via the battery
latched to one end of the battery pack. When latched
charger cable, Electrical Power Cable Assembly CX-
together,
the
receiver/exciter
is
electrically
13032/PRC-104. For maintenance or operation of the
interconnected with the amplifier/ coupler via a built-in
radio set without the battery pack, a dc power source can
connector; the battery pack power is connected to the
be connected to the amplifier/ coupler via the bench test
amplifier/coupler. All operator controls and connections
cable, Electrical Power Cable Assembly CX-13030/PRC-
are located on the receiver/exciter front panel, except for
104.
the antenna select switch and antenna connections
which are on the amplifier/coupler front panel.  The
1-12. In the manpack configuration, the radio set and
receiver/exciter  and  amplifier/coupler
units
are
accessories are carried in the military standard ALICE
constructed on a die-cast aluminum housing, the battery
backpack (All-Purpose Lightweight Individual Carrying
pack housing is tough plastic. Watertight seals for the
Equipment). The backpack may be used to carry spare
covers and panels make the three units watertight,
battery packs and other accessories.
submersible, and capable of rough handling and abuse
of any field environment. The unit circuits are modular
for ease of repair. The total weight of the assembled
1-13. Fixed-Site Operation. When the tactical situation
AN/PRC-104 (three units with battery) is 14 pounds,
permits, the effective range of the AN/PRC104 may be
making a lightweight and easily carried package.
extended by utilizing Antenna AS-2259/ GR, the 15-foot
near-vertical incidence Skywave (N) antenna, or a simple
half-wave dipole. Twofoot long Radio Frequency Cable
1-10.
Manpack Operation.
The basic Manpack
Assembly CG-3815/ _antenna base cable) is used to
configuration consists of the radio set (three units), a "
connect the N'VIS Antenna Base AB-1241/PRC-104 to
hip antenna and an audio input/output device. Antenna
the BNC jack of the amplifier/coupler.
AT-217A/PRC is a 10-foot standard whip ,antenna that
screws into Spring Section  Antenna AB129PR shock
mount which in turn screws into the .antenna mount on
the
amplifier/coupler.
The
whip
1-2


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