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Voice Teltron
Time domain voice scrambler
The SP-810 was a voice encryption device sold by Teltron
in the late 1970s. It was designed and built as an OEM product by
Telsy in Turin (Italy). It was one of the first
voice encryption devices built by Telsy, after the company started in 1971,
and was mainly used by the Italian government.
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The unit is pretty small and could easily be added to existing equipment,
such as mobile radio systems used by the Army and by the Police,
using the large connector at the front
and the two smaller connectors at the rear.
The image on the right shows the front panel of the SP-810.
The small PCB with the labyrith-style tracks is the actual cryptographic key.
Its layout is symmetric, which means that it can be inserted both ways
(upside down).
Functionally, the SP-810 is identical to the
Telsy TS-500.
The key cards of both units are also identical.
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Although the design of the key card might give the impression that the SP-810
is a simple device, this is definitely not the case. The unit is a Time-Domain
Voice Scrambler, with a Delta Modulator at its heart, built around two FX-209
voice processors made by CML in the UK [1].
One of these chips is used for transmission, whilst the other one is used
during reception. For further details, please refer to the page about the
Telsy TS-500.
➤ More about the Telsy TS-500
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© Crypto Museum. Created: Wednesday 29 February 2012. Last changed: Wednesday, 21 August 2024 - 09:00 CET.
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