Oh my goodness. I think this is the only place on the internet nerdy enough to help me locate this info.

My parents met on a what was effectively an unofficial chat room hosted by capital radio (London). In the 1980s, Capital Radio used to leave their switchboard open at night (unintentionally, they didn’t realise it was happening) and people would call the regular radio phone and just end up in what was effectively a giant group call for Londoners late at night. (I say Londoners due to the reach of the radio rather than the phone line itself, people wouldn’t know the number unless they listened in).

I understand they changed how the phone system worked later in the 80s and closed this loophole off.

So what I’m after is…
- the nature of the switchboard that allowed this to happen - edit now answered
- what change would have blocked this later on - edit now answered
- any historic info on the period it was left open, or personal accounts - still pending, trying other social media too for this

#radio #capitalradio #phreaking #VintagePhoning #1980s #retrochatroom

@leymoo

In the US, that was called a party line. To reduce costs, a bunch of people would share a single line that only one person would use at a time out of courtesy, BUT anyone sharing the party line can actually listen in or talk if they want to.

Alfred Hitchcock Presents looks like it was a US TV show. In 1960, there was an episode called party line.

The alternative is a private line.

@Theresacityinmymind I’m curious as to whether there was specific telecom kit that radio stations used to manage calls in the 70s and 80s - maybe if there was a bit of kit it used the same concept to work as the party line concept in the US, but on purpose? I understand the UK switched from US style phone networks to their less phreakable system (System X - https://en.wikipedia.org/wiki/System_X_(telephony) ) by the early 80s - a black box would work on UK networks up until that switchover.
System X (telephony) - Wikipedia

@leymoo @Theresacityinmymind The UK switchover from analogue strowger to System X (& System Y), took a very long time, most of the 80s and into the 90s before it was completed. It did however leapfrog the crossbar systems used in other countries, going straight from electro-mechanical to digital.

I do recall various UK universities and employers I was at in the early 80s having fully digital PABX systems ahead of the PSTN going digital. It's possible but unlikely the chat room was a PABX digital conference bridge, but I suspect the analogue theory is more plausible.