Post #2027512
2025-09-17 20:46 UTC
@leymoo Capital phone-ins are mentioned (with photos) here:
http://www.samhallas.co.uk/repository/journals/Post_Office_Telecommunications_Journal/POTJ%20Vol%2025%20No%204%20Winter%201973-74.pdf
The unit with all the switches in the bottom left of the cover photo is the key-and-lamp unit
The use of KLUs changes my technical theory, but there are other options. the announcer mentioned in the article may have been switched off or faulty, or multiple keys on the KLU could have been left operated, or something else entirely!
This has been quite a fun little technical research jaunt!
Replies (2)
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@Extelec@mstdn.social 2025-09-17 21:14
@lpbkdotnet @leymoo radio stations that did call in shows, did have equipment that would automatically answer incoming calls and connect them to a common circuit, usually playing the stations output. It's concevable that out of hours with no music feed, or operator these lines would have worked as a large lossy bridge. No reference to London, but i knew of one system locally. I built an electronic replacement for one in the early 90's (without BT approval)
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@axel@hsnl.social 2025-09-18 05:50
@lpbkdotnet @leymoo Oh wow, that telecoms magazine brings back memories! Thanks!