04-07-2021, 11:17 AM
Steve in Pudsey post_id=25690 time= user_id=942 Wrote:Inspector Sands post_id=25665 time= user_id=1003 Wrote:Were there not enough circuits around the country to have both TVam going to the transmitters and the first ITV programme going to the regional companies at the same time?
Could they have used the C4 distribution?
Well, C4's transmitters came on at about 08:00 hrs with their 'local' ETP 1s, and then these were switched to Charlotte St's pres output at 08:30 hrs, so they didn't.
C4's dist (rather like BBC 1 and 2) was pretty well a fixed affair, starting life in London and 'hard wired'
If you refer to the the drawing Fig 8/page 32 in IBA Tech Review 20 (linked up thread in here) it does indicate the national ITV dist network was used (otherwise the data bridging arrangements for Oracle would have been even more complex). It also shows TV-am five Macro Regional feeds that left the London BT tower. 'Net 1' was London/TVS/Anglia regions. There was probably a West/Wales Macro that left London on the Bristol/Cardiff/Plymouth leg, and the other three 'up country' on the LON/Brum/MCR spine. Don't forget TV-am's site at Knutsford that had links to Manchester to generate further macro regions northwards from there.
http://www.dgsys.co.uk/btmicrowave/sites/293.php