- #ARMY RADIO COMMUNICATIONS HOW TO ENCODE A MESSAGE USING A MANUAL#
- #ARMY RADIO COMMUNICATIONS HOW TO ENCODE A MESSAGE USING A PORTABLE#
- #ARMY RADIO COMMUNICATIONS HOW TO ENCODE A MESSAGE USING A CODE#
Improved technology enabled the Army to specify a burst-CW requirement as the Soviet Radio Electronic Combat (REK) direction finding capability improved. The T-748/GRC-109 transmitter has the addition of the panel connector and internal circuitry for the “burst” high speed keying transmission capability. The main difference between the RS-1 and GRC-109 sets is the T-784/GRC-109 transmitter. The RS-1, GRC-109 and GRC-109A sets were all made by different companies reportedly RDR, NEMS, Admiral Corporation and Oklahoma Aeronautics respectively.Īside from component designators, identification labels and minor mechanical differences they are essentially the same in operation and appearance, especially the receivers, both power supplies and all external accessories. As a practical matter they were probably considered interchangeable (except for the burst keying capability) when available and as needed. The GRC-109 appeared about 15 years after the RS-1 sets first entered service. A cost effective solution enabled by experience. Army specification did reflect the basic design of the RS-1 as the functional basis for the new AN/GRC-109 but to be supportable into the future with standardized training, repair parts and depot maintenance within the U.S. (I have not found an equivalent CIA design and performance specification for the earlier RS-1.)īy 1965 the CIA noted that available stocks of their RS-1 sets were “diminishing”.
It contained detailed design and performance requirements for what was to become the new AN/GRC-109. The capabilities of the CIA’s late-1940’s vintage RS-1 looked good.Ĭonsequently, Specification MIL-R-55242 was issued, dated 21 October 1963.
#ARMY RADIO COMMUNICATIONS HOW TO ENCODE A MESSAGE USING A PORTABLE#
The AN/GRC-109 is the Army’s specified replacement, in Army service, for the capabilities of the CIA’s RS-1 radio set which had already been in widespread use by the CIA and “borrowed” by the US military in the 1950’s and 1960’s.īy the early 1960’s the US Army already needed their own dedicated, small radio set as their versatile GRC-9’s were both big and overly complex for portable ops but also well into obsolescence. North Korea had invaded South Korea 2 days earlier on 25 June 1950. In a 27 June 1950 internal CIA memo, the Communication Division Chief was directed to make 1205 RS-1 sets available at 9 different locations for issue to agents (along with 1225 RS-6 sets among others).
The “Angry 109” Lineage: The US Army did not “adopt” the Central Intelligence Agency’s RS-1 by simply relabeling it as the AN/GRC-109 as many have assumed.
#ARMY RADIO COMMUNICATIONS HOW TO ENCODE A MESSAGE USING A CODE#
(Morse code “cut numbers” crypto transmission Net callup from the Peoples Socialist Utopian Paradise of Cuba, 5800 kc, late one night.) Reportedly Castro’s government ( Dirección de Inteligencia) spy communications system at work. The AN/GRC-109 (AKA the GRC-109) described below is my “Daily Driver”.
#ARMY RADIO COMMUNICATIONS HOW TO ENCODE A MESSAGE USING A MANUAL#
The Tech Manual is TM 11-5820-474-14 and is available on the Interwebs. When repair by Swaptronix isn’t an option……………………Ditty Dum Dum Ditty They were, and are extremely reliable, rugged and even quite EMP-resistant. These sets have a Cool Factor 36.6 db higher than any plastic RiceBox ever made by KenYaeIc. It was “The Jeep of the radio world” as dubbed by a former Special Forces radio operator in Vietnam (Reference 53).Įxtremely rugged and designed to survive parachute drops and ground pounders they were built and tested to withstand lengthy burial in the ground or even under 16 feet of water (“with or without top cover”) as part of a clandestine equipment cache. Note the receiver battery and the use of the built-in CW key. Probably feeding a dipole with WD-1/TT twisted field telephone wire as an expedient antenna. Note the transmission line split into 2 conductors to the transmitter GND and ANT terminals. Training Bolivian soldiers with the GRC-109 Radio
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