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Mixer machine
The TP-845-A was a complete mixer encryption unit
based on the Vernam Cipher. It was built around 1970 by
ACEC in Charleroi (Belgium) and was used by the Belgian Army. It was suitable for both online and offline enciphering and could
be used with ordinary telephone lines as well as over radio. In the latter case
it was often used in combination with the AN/GRC-9.
The keyboard of the machine has the same layout as a French typeweriter
(AZERTY), indicating that it was probably designed by a French company.
Strangely, is uses the Coquelet-13 code
[3]
rather than the more common
Murray code (Baudot),
rendering it incompatible with other NATO systems.
The complete TP-845-A system, consists of the following items:
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- TP-B6-A Teleprinter (with built-in paper puncher)
- CTS-A Cryptographic unit (with double paper-tape reader)
- B6-A Power Supply Unit (PSU)
- Canvas bag with cables and spare parts
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This page is a stub.
This cipher machine has recently been donated to the Crypto Museum.
We are currently investigating and restoring it and hope to be able to
descibe it in more detail before long. If you have any information about
this machine and its use, please contact us.
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- Military Communications Museum (Belgium), Math Driessen (ON8PO)
TP-845-A featured on this page, courtesy Math Driessen.
- TP-845-A service manual, Telecijferaaruitrusting TP-845-A (Dutch)
Generale Staf van de Landmacht, Directie van de Transmissie, 1970.
TM 11-2630-04-35-11
- Roland Prösch, Technical Handbook for Radio Monitoring
Books on Demand, Germany, 2007.
ISBN: 9783833490156
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© Copyright 2009-2012, Paul Reuvers & Marc Simons. Last changed: Mon,14 May 2012.09:37:21
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