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Elcrovox 1/3
Narrowband voice encryptor - this page is a stub

Elcrovox 1/3 is a high-end military voice encryption device, developed around 1972 by Siemens in München (Munich, Germany) for use by the German Army (Bundeswehr) and by NATO. It uses a proprietary encryption algorithm and was succeeded in the late 1980s by the Elcrovox 1/4.

The device is approx. 19" wide and is housed in an olive green aluminium transport case, from within it is operated. Controls and connections are at the front. At the centre is a locked hinged door behind which the KEY material is installed.

The image on the right shows an typical Elcrovox 1/3, from the collection of the Museum for Tele­communication in Frankfurt (Germany) [1]. The device was used in many NATO countries, such as Germany, the Netherlands and also Canada. According to the US, it's quality was comparable to the NSA-developed STU-II voice encryptor [3].
  
Elcrovox 1/3. Photograph courtesy Museumstiftung Post und Telekommunikation [1].

The problem with the Elcrovox 1/3 however, is that it is not interoperable with the STU-II, which limits its usability. This problem was solved in March 1983, with a bi-lateral arrangement, that allowed Germany to develop its own STU-II compatible products, just like Philips Usfa had done a few years earlier [3]. It resulted in the development of the backwards compatible Elcrovox 1/4 which was fully interoperable with the STU-II and compatible products like the Spendex-40.


Test device 2
Several test devices were available for testing the performance of the Elcrovox 1/3 and for finding faults in its operation. The image on the right shows Test Device 2 (German: Prüfgerät 2), that can be connected directly to the Elcrovox 1/3.

The device comes with four test cards that are stored behind the hinged door at the right. These cards are intended to replace specific cards inside the Elcrovox 1/3 during the test.
  
Prüfgerät 2 (test device 2) for Elcrovox 1/3

With cover closed With from cover removed Prüfgerät 2 (test device 2) for Elcrovox 1/3 Front view Front panel Opening the hinged lid Test cards stored behind hinged lid Instructions inside front cover
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With cover closed
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With from cover removed
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Prüfgerät 2 (test device 2) for Elcrovox 1/3
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Front view
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Front panel
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Opening the hinged lid
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Test cards stored behind hinged lid
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Instructions inside front cover

Help wanted
At present, no further information about the Elcrovox 1/3 is available. You can help expand this page by providing additional information and material. For contributions, please contact us.


References
  1. Museumsiftung Post und Telekommunikation, Image of Elcrovox 1/3
    Frankfurt (Germany). Retrieved Spetember 2017.

  2. Anonymous, Prüfgerät 2 für Elcrovox 1/3 - THANKS !
    Elcrovox 1/3 Test Device 2. September 2017.

  3. The Joint Chiefs of Staff, Memorandum for Record
    WINTEX 83 First Impressions Conference, 22 March 1983.
    Declassified 14 December 2012, EO 13526.
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© Crypto Museum. Created: Thursday 21 September 2017. Last changed: Sunday, 24 September 2017 - 13:13 CET.
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