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Teltron SP-810
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.

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.
  
Teltron SP-810

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.

Teltron SP-810 SP-810 front panel Teltron SP-810 SP-810 Key Card SP-810 connections at the rear

References
  1. Consumer Microcircuits Limited (CML), FX-209 Datasheet
    Retrieved June 2013.
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