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Li. Spr. 80
Opto-electronic voice transceiver - this page is a stub

Lichtsprechgerät 80, abbreviated Li.Spr.80, was a free-space optical communication device, manu­factured from 1940 onwards by Carl Zeiss Jena 1 (Germany) for use by the German Armed Forces. It uses visible and infrared (IR) light for voice communication (telephony) over distances of up to 10 kilometres. A complete setup consists of a tripod with a dual-lens optical system, and a separate amplifier/power supply unit (PSU) that is connected to the optics via a 2 metre cable.

The device has two 80 mm lenses that focus the light in such a way, that it projects a 1 metre spot at a distance of 1 km.

  1. During WWII, Carl Zeiss Jena was identified with the manufacturer code 'blc'.

  • Device
    Optical communication device
  • Purpose
    Covert voice communication
  • Model
    Li.Spr. 80
  • Manufacturer
    Carl Zeiss Jena (blc)
  • Country
  • Year
  • User
    Wermacht (Germany, WWII)
  • Modulation
    A1, A3
  • Output
  • Source
    4W glowlamp with prism and focussing optics
  • Valves
    5 × RV2P800
  • Power
    2V, 1.5V, 50V, 60V
  • Dimensions
    430 × 320 × 170 mm
  1. Das Lichtsprechgerät (80 mm)
    D 877/2. Berlin, 8 September 1938.
  1. Centre for German Communication
    CDV&T. Visited 20 September 2023.

  2. Wikipedia, Free-space optical communication
    Visited 20 September 2023.

  3. Radio Wiki, Wehrmacht Lichtsprechgerät Li.spr.80
    Visited 20 September 2023.
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© Crypto Museum. Created: Wednesday 20 September 2023. Last changed: Wednesday, 20 September 2023 - 16:49 CET.
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