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USA Spy Radio Set
The AN/PRC-64 was a true spy radio set, developed by Delco
(US) in the early 1960s as a possible successor to the
AN/GRC-109 (RS-1).
It was intended for use by Special Forces
(SF) and for espionage activities.
The design was based on the Delco 5300 that was used by the CIA.
It was extremely popular with the Special Operations Group of the
Australian Army in Vietnam.
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During their lifetime, most of the PRC-64 units were upgraded to
PRC-64A, which allowed faster burst transmissions in combination
with the AN/GRA-71 burst encoder (see below).
The image on the right shows a typical PRC-64A radio set with the
main accessories connected. Apart from the sweet little bakelite
morse key, an even smaller key is present
on the radio itself.
Contary to other spy sets of the same era, the PRC-64 was also
suitable for voice transmission, hence the presence of a dynamic
microphone.
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The PRC-64 was an extremely compact unit for its time and measures
only 25 x 13 x 12 cm. Even when packed together with the accessories
in the canvas carrying bag, the set measures less than 35 x 14
x 14 cm. The unit is powered by an internal battery and is switched
on by opening the top lid.
The small size however comes at a price, as the HF output power
is no more than 5 Watt (CW morse) or 1.5 Watt (AM voice).
Frequency selection of the PRC-64 is crystal controlled, limiting
its operation to 4 preset channels. Receiver and transmitter each have
their own set of 4 crystals to allow split-frequency operation.
The frequency range is from 2.2 to 6.0 MHz.
RX and TX frequencies are usually written in a table inside the top lid.
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The PRC-64 is usually operated with an external key when sending
messages in morse code.
A small bakelite morse key was therefore
supplied with the set. It has a small piece of wire (50 cm) with
a 7-pin connector at the end.
and connects to the blue KEY socket
at the front right of the radio.
The same socket is used to connect an external burst encoder.
For emergency purposes, the PRC-64 also has a tiny little
internal morse key on its front panel.
It is located to the left of the KEY socket. It has a flattened side
to allow the case lid to pass by.
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The PRC-64 was usually supplied with two ear pieces; one
for each ear. It also allowed a second person to listen
to the incoming message. At the center of the front panel
are two PHONE sockets.
Unlike most other spy sets of the same era, the PRC-64 can
also be used for the transmission of voice messages.
A small dynamic microphone is supplied,
which connects to a socket at the far right of the front panel.
When used for speech, the mode-selector has to be set to AM.
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When unused, the PRC-64 is normally stored inside a small rugged
canvas bag, together with the main accessories, such as microphone,
ear pieces, morse key and antennas.
The image on the right shows the canvas bag with the PRC-64 radio
at the center. Two small pockets - one at either side of the bag -
are used to store the accessories.
Microphone, ear pieces and morse key are
stored in one pocket, whilst the antenna reels
are stored in the other one.
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The PRC-64 was derived from the Delco 5300 radio that was built
especially for use by the CIA. The Delco 5300 is physically identical,
but has a black case, rather than green, and has a slightly different
frequency range (3.0 to 8.0 MHz).
Furthermore, some of the controls on the front panel
are red rather than black.
At the moment we don't have a picture of the Delco 5300 available.
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Due to the modular construction of the PRC-64, the radio is easily
serviceable. After removing 10 bolts around the edges of the front
panel, the entire radio can be taken out of the case.
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As the entire radio is bolted to the front panel, and all controls
and connections are on the front panel, the radio can be operated
outside the case. After removing the knobs and some bolts from the
front panel, each module can be removed easily.
Some modules, such as the receiver, can even be operated when removed,
by using an extension cable, making it easier to adjust it.
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- TM 11-5820-552-15
Operator and Maintenace Manual for Radio Set AN/PRC-64A.
Department of the Army, US Army Publications Center. 16 November 1970.
- Radio Set AN/PRC-64, Final Report
Defense Documentation Center for Scientific Information.
Army Concept Team in Vietnam, 15 May 1965. Unclassified.
- Technical Report No. 67-01, Radio Set, AN/PRC-64
U.S. Army Limited War Laboratory, Unlimited Distribution.
Stanley D. Peirce, April 1967
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© Copyright 2009-2011, Paul Reuvers & Marc Simons. Last changed: Tue,12 Apr 2011.22:37:42
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