PaulKing Posted May 29 Share Posted May 29 Hi All, I’m new here and a fraud as I don’t install security alarms but came across your forum when searching Radiovisor. I’ve just picked up from a house clearance sale two intriguing wall mounted Radiovisor devices that seem to use infrared and I wanted to try and find out their original application. I will try and attach pictures but they are both around 6” square and 4” deep, one having a single lens and one having twin lenses. They are badged “Radiovisor” and inside have the type BA500T. They appear to be from the 1930-40 era but bear no dates. Can anyone give me any clues as to where they would have been used and what for as I’m intrigued by them? They’re going on the wall in the utility room, come what may, but I’d like to find out about them if I possibly can! Thanks for any help you can give! Paul King, Kent Quote Link to comment Share on other sites More sharing options...
PeterJames Posted May 29 Share Posted May 29 They look like early IR beams transmitter and receiver. Quote Link to comment Share on other sites More sharing options...
PeterJames Posted May 29 Share Posted May 29 The would normally go across a large doorway or similar the modern version would look like below Quote Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted May 29 Share Posted May 29 Radiovisor specialised in Active IR beams. Never seen any so old tho. They work as a pair. Usually an IR beam is emitted then reflected back it detects if something blocks this. Quote Link to comment Share on other sites More sharing options...
MrHappy Posted May 29 Share Posted May 29 1 hour ago, PaulKing said: They appear to be from the 1930-40 era but bear no dates. Looks 1970s to me ? Quote Mr Veritas God Link to comment Share on other sites More sharing options...
PaulKing Posted May 30 Author Share Posted May 30 Thanks guys, those are helpful comments and confirm my thoughts although it’s useful to hear how they might have been used. When cleaning them yesterday I noticed that the single lense was red but the twin lenses are black, similar to welding goggles. I presume that the red would be the transmitter as there is a diode behind the internal curved lense? Quote Link to comment Share on other sites More sharing options...
PaulKing Posted May 30 Author Share Posted May 30 Mr Happy, what makes you think it might be 1970’s, is it the wiring colours or the style of the components? Quote Link to comment Share on other sites More sharing options...
al-yeti Posted May 30 Share Posted May 30 (edited) 11 hours ago, MrHappy said: Looks 1970s to me ? You looking in mirror on a good day? Edited May 30 by al-yeti Quote Link to comment Share on other sites More sharing options...
james.wilson Posted May 30 Share Posted May 30 The first production of an Led was 1962 1 Quote securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted May 30 Share Posted May 30 The PCB material makes me think 70s. The capacitors maybe look more modern? It's probably hard to date if they would have been hand built and low batch numbers? Quote Link to comment Share on other sites More sharing options...
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