{"product_id":"original-german-wwii-lichtsprechgerat-80-80-in-original-case-by-carl-zeiss-dated-1940","title":"Original German WWII Lichtsprechgerät 80\/80 in Original Case by Carl Zeiss - Dated 1940","description":"\u003cp\u003eOriginal Item. Only One Available. Telephone communication is possible by modulating a lightbeam. The Germans built such a system which can be seen as a predecessor of the fibreoptic techniques of today. Along the \u003cem\u003eAtlantikwall \u003c\/em\u003eyou find many Vf bunkers specially designed for these instruments. Communication with small islands for the coasts was made possible with a small lightbulb of 5 Watts. In the Dutch Scheldt estuary two sets placed in Tobruks were used. But of course the system is light-dependent, so heavy rain and snow causes interruptions. The maximum distance was 4 kilometers. To obscure the transmission at night an infrared filter could be placed. This reduced the range to 2.5 kilometers.\u003c\/p\u003e\n\u003cp\u003eThis is a great set of Lichtsprechgerät 80\/80 in its original carrying case. The set has a data plate on the front reading:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eblc\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e218124\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e1940\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cem\u003eLichtsprechgerät 80\u003c\/em\u003e (Light Talk Device 80), abbreviated Li.Spr.80, was a free-space optical communication device, manu­factured from 1940 onwards by Carl Zeiss (maker code blc) for use by the German Armed Forces. It uses visible and infrared (IR) light for voice communication (telephony) over distances of up to 10 kilometers. 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.\u003c\/p\u003e\n\u003cp\u003eThis set does not include the tripod or the supply unit, so it is more meant for display. However, it does appear to be in full working order from what we can see, so this is a great opportunity to start putting a set together.\u003c\/p\u003e\n\u003cp\u003eThese sets are extremely difficult to find, and there isn’t much information on them broadstroke. This would be a great research project. The case retains its original securing straps with springs and is named on the top\u003cstrong\u003e “BOD.”\u003c\/strong\u003e The case measures \u003cstrong\u003e12 x 8 x 5½”\u003c\/strong\u003e. The case is marked \u003cstrong\u003eblc 42\u003c\/strong\u003e for the same maker, Carl Zeiss, with a manufacture date of \u003cstrong\u003e1942\u003c\/strong\u003e. This case has a different serial number than the set itself.\u003c\/p\u003e\n\u003cp\u003eThis set is in great shape overall without any serious issues. Comes ready for further research and display!\u003cbr\u003e\u003c\/p\u003e","brand":"Original Items","offers":[{"title":"Default Title","offer_id":41982832541765,"sku":"ONJR24MG084","price":695.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1524\/1342\/files\/ONJR24MG084__01.jpg?v=1726232560","url":"https:\/\/www.ima-usa.com\/products\/original-german-wwii-lichtsprechgerat-80-80-in-original-case-by-carl-zeiss-dated-1940","provider":"International Military Antiques","version":"1.0","type":"link"}