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Germany
France
Cold War
  
← ESK-52
  
ESK-632
German spy radio set - this page is a stub

The ESK-632 was an HF spy radio station for CW signals (morse), developed by Telefunken in Hannover (Germany) in 1954 for clandestine operations of the French intelligence services. The radio was based on the ESK-52 but was also suitable for speech transmissions in AM (phone).

Like its predecessor – the ESK-52 – the design of the ESK-632 is based on the wartime British Type 3-Mark II (B2). For security reasons, both transceivers were listed as Amateur Radio Set.

The exterior and the internal circuits are nearly identical to those of the ESK-52. The difference is the addition of an AM modulator that made it possible to use the rig for phone conversations. This is visible at the centre of the front panel, between the knobs E11 and E13. The ESK-632 has a 6 mm jack for a microphone, and a switch to select between microphone and morse key.
  
Telefunken ESK-632 spy radio set

The ESK-52 only has a socket for a morse key at this location. Depending on the application, the ESK-632 came as a bare device – as shown above – but also in an unobtrusive travel suitcase, or in a rugged wooden transit case. For further information, please refer to our ESK-52 page.

Telefunken ESK-632 spy radio set
Connections
PSU
Mains voltage selector
Mains voltage meter
A
×
A
1 / 5
Telefunken ESK-632 spy radio set
A
2 / 5
Connections
A
3 / 5
PSU
A
4 / 5
Mains voltage selector
A
5 / 5
Mains voltage meter

Documentation
  1. Mise en Marche de l'Emetteur Telefunken
    Original short form instructions (in French language).
    Part of cover sheet removed. 4 pages.

  2. Tableau d'étalonnage pour recepteur
    Original frequency table. No. 0059. 1 page.

  3. Reglage due Poste E.R. 20 W (Poste valise Téléfunken)
    Telefunken ESK-52 setup procedure. 5 pages. 1

  4. Operating and circuit descriptions for ESK-52 and ESK-632
    Operating instruction in French language. Circuit diagrams in German.
    8 July 1952 — 8 March 1954. 1,2

  5. ESK-52 and ESK-632 circuit diagrams
    Extracted from [D]. 1
  1. Poor quality copy.
  2. The extra circuit (AM voice modulator) of the ESK-632 is embedded within this manual (page 23-26).

References
  1. Helmut 'Jim' Meyer, HS0ZHK, My way to Ham - Radio and beyond
    Website QRZ.COM. Personal correspondence. Retrieved May 2014.

  2. Louis Meulstee, Wireless for the Warrior, volume 4
    ISBN 0952063-36-0, September 2004
Further information
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Crypto Museum. Created: Friday 30 November 2018. Last changed: Tuesday, 17 August 2021 - 18:50 CET.
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