1970s NOS Military Morse Dot Dash Coder MX4495 For A GRA71 Electromechanical Burst Encoder

This is a 1970s NOS Military Morse Dot Dash Coder MX4495 For A GRA71 Electromechanical Burst Encoder, which forms part of covert surveillance (spying) radio communication history.

It is in very good unused condition but I don't know whether or not it is working, and is being sold as a collectible for display only.

This small device was supplied as an alternative to the heavier MX-4496 alphabet coder. It comprises three buttons: for creating Morse dots, dashes and spaces without an external power source. The morse code is then stored on tape, MA-9 cartridge, before transmitting using the 'keyer,' both of which are also available to purchase. 

Manufactured by Arvin Industries Inc., serial no. 1136

This is the military version of the magazine in a black box; the whole set was designated GRA71. It was used with USA army radios and CIA spy radio sets such as the AN/PRC-64A and RS-1 (AN/GRC-109).

A very rare item and often missing from the GRA71 burst coder spy set.

The Electromechanical Burst Encoder was invented by Stenographic Machines in Skokie, Illinois, USA, for the CIA (Central Intelligence Agency). It allowed pre-recorded messages to be sent, in morse code, at very high speeds. This was an essential requirement ensuring that the operator was on air for the minimum time possible to prevent detection by RDF (Radio Detection Finding).

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