UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Telephony and Telecomms

Notices

Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment

Closed Thread
 
Thread Tools
Old 16th Oct 2019, 7:11 pm   #21
Dave Moll
Dekatron
 
Dave Moll's Avatar
 
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,113
Default Re: GPO Modems

Ten out of ten.

I only noticed when I was looking at the image earlier today. The giveaway is the cutout on the right-hand side to allow the handset cord to exit with the lid closed.
__________________
Mending is better than Ending (cf Brave New World by Aldous Huxley)
Dave Moll is offline  
Old 21st Oct 2019, 2:50 pm   #22
Beardyman
Hexode
 
Beardyman's Avatar
 
Join Date: Jan 2018
Location: Portsmouth, Hampshire, UK.
Posts: 420
Default Re: GPO Modems

Seeing post number 7 reminded me of a company I worked for many many moons ago now long since defunct (Transdata Ltd). They had bought in a couple to "have a look at" if you know what I mean! They (within about 3-4 months I believe) came up with their own version namely the 307 & 307A acoustic couplers. Both very good in their own right (up to 300bd), we sold thousands of the things, mainly to the GPO! I remember testing 30-50 a day & then on Fridays sitting down with the duff ones & fixing them. I always thought the GPO one was far better built, it just looked right.
__________________
The difference between stupidity and genius is that genius has its limits. (Einstein)
Beardyman is offline  
Old 23rd Oct 2019, 12:54 pm   #23
john_newcombe
Hexode
 
Join Date: Apr 2019
Location: Skipton, North Yorkshire, UK.
Posts: 252
Default Re: GPO Modems

I use to have a set of 2B modems, in a '62' type rack, I bought them for scrap and used them in answer mode for the original Telstar BBS back in 1981/2. I had all of the circuit diagrams at one point. I will have a look but I haven't seen them for years and years.

I still have a few of the DM424X type modems and a few others. I also have an auto answer board for the Nightingale series of devices.
john_newcombe is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 8:21 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.