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Teltron SP-850
Voice encryption unit - under construction

The SP-850 was a voice encryption unit, based on the principle of frequency and time-domain voice scrambling, also known as two-dimensional scrambling, developed around 1983 by Teltron in München (Germany) as the sucessor to the SP-810, which was in fact a rebadged OEM product. The SP-850 was intended for use by the German police and could be connected to any existing VHF/UHF radio instead of the normal handset, although some radios had to be modified for this. The SP-850 was also sold as an OEM product by ANT, where it was known as ANTSEC 1003.

The image on the right shows an SP-850 with a typical coiled cable by which it was connected to the radio. The device is powered by the radio to which it is connected, which means that some radios had to be modified first. The SP-850 offers 16 possible external code settings (0-9 and A-F) and another 256 internal ones.

The same electronics were available for other applications, such as the SP-815 which could be built inside an existing radio.
  
Teltron SP-850

Teltron SP-850 Holding the SP-850 Operating the PTT Indicators Controls Slot for bracket Front view Type and serial number tag
Controls




Interior
Although the SP-850 looks like a very simple device from the outside, it is in fact a very complex piece of technology, consisting of no less that four fully populated PCBs, stacked together as a sandwich, and mounted inside a milled aluminium enclosure. By all accounts an expensive piece.

The case can be opened by removing three long screws from the back of the device. This allows the front case shell, which contains the speaker, to be removed. The four PCBs are held together by means of long contact arrays at the edges of the boards. All board can be removed easily, except for the interface board with is soldered to the controls.   
Interior - 4

Interior - 1 Interior - 2 Interior - 3 Interior - 4 PCB 1 PCB 2 Digital board
Controls mounted in the milled-out case Custom components Custom components detail Cable connection Audio board detail Audio processing Interior
References
  1. Helmut 'Jim' Meyer, Teltron SP-850 voice scrambler - THANKS !
    Devices kindly donated by Jim Meyer, June 2014.
    Personal correspondence, July/August 2015.
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Crypto Museum. Last changed: Thursday, 20 August 2015 - 10:24 CET.
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