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Siemens MSC-2001
Voice Encryption Unit

The MSC-2001 is a voice encryption unit, developed and manufactured around 1978 by Siemens in Munich (München, Germany). Although it can basically be used in the audio line of virtually any radio set, it was intended for use with the AN/PRC-77 radio. Up to 8 different crypto keys can be stored in the device. The current key is selected with a rotary key at the front panel.
 
The rotary key can also be used to select CLEAR mode (i.e. no crypto) and to ZEROIZE (i.e. clear all keys). The unit connects to the radio via a short cable between the TX/RX socket and (typically) the AN/PRC-77 radio.

New crypto keys are loaded into the device by means of a special key fill unit that connects to the REMOTE socket. Two different key fill units were available: the S42043-E522-A1, that allowed up to 8 different keys to be loaded by means of 5-bit paper tape, and the S42043-E522-A2, that had a build-in memory.
  
MSC-2001 front panel

Below are copies of the brochure, a brief description and the user manual. At present we have no further information about this unit. If you know more, or if you have further background information, please contact us. We are in particular looking for the key loader. As we have two such units, it would be nice if we were able to demonstrate it at some point.
 
Siemens MSC-2001 with yellow protective caps over the sockets Siemens MSC-2001 MSC-2001 front panel Serial number tag at the rear

 
References
  1. Siemens, MSC 2001, Brochure
    8 pages (German). June 1979.

  2. Siemens, MSC 2001, Beschreibung und technische Daten
    Description, chapter 3, 3 pages (German). Date unknown.

  3. Siemens, Sprachschlüsselgerät MSC 2001, Bedienungsanleitung
    User manual (German). S42043-E9-P201/D. December 1978.

Further information

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