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DDR Stasi WSA-6
Spy base decoder
- this page is a stub
MEZ-12, also known as Projekt 32213, was a decoder for agent
burst transmissions, developed by the OTS of the Stasi
— the intelligence service of the former DDR (East-Germany).
The device is part of the WSA-6 spy radio link,
and was used in the East-Germany base station,
often in combination with an existing HF receiver, like the
EKD-300 or EKD-500. It decodes the numeric agent-to-base
messages that are sent at 900 baud using Frequency Shift Modulation (FSK).
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The image on the right shows the front panel of the MEZ-12.
It is housed in a 19" enclosure and consists of two modules:
a power supply unit at the top and a decoder at the bottom.
The decoder is responsible for translating
the special 2-of-5 code
to regular telegraphy numerals (0-9) in
ITA-2 (Baudot) format. It also buffers the data and puts
the numbers back in the original order before passing them
to the connected teleprinter.
The latter is necessary, as the originating WSA-6 spy radio set applies
an error-spreading technique to the data before transmission.
No further information about this device is currently available.
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The diagram below shows how and where the MEZ-12 (32213) was used.
At the left is the agent station consisting of the
WSA-3/A (32212) burst transmitter and a controller.
At the right is the spy base, which was usually located in an
Eastern Bloc
country, like East-Germany or Russia.
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© Crypto Museum. Created: Sunday 08 June 2025. Last changed: Sunday, 08 June 2025 - 10:55 CET.
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