Racal MA4204 Voice Scrambler

 
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The MA4204 audio encryption device inserts itself between the microphone/ handset  receptacles  (Audio1 or Audio 2) and the output plug to the receiver.  (Photos via E-bay)
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Above and below: Internal views of the MA4204. 
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Nameplate sample.
All photos in this table via E-bay

 
 
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MA968B battery box for MA4204. Top view 
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MA968B battery box for MA4204. Inside view 
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MA968B battery box for MA4204. Bottom view 

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Aug 16/17