Racal MA4471 Telephone Encryption Unit.



 

MA4471_01.jpg
MA4471 view of front panel. This device is circa April 1997. 
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MA4471_03.jpg
MA4471_04.jpg
MA4471_05.jpg
The above four images illustrate the circuit boards and their interconnection. Download image yo enlarge. 
MA4471 Operating Instructions 
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Oct 5//20