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← Teltron Voice
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.
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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.
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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.
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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.
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© Crypto Museum. Created: Thursday 02 July 2015. Last changed: Saturday, 24 February 2018 - 21:19 CET.
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