When the screen went to black, there were a few glitches before the Central logo opened up, as it were.
At 07:53 ? They look like bands of vehicle ignition interference to me, local pick up on signal as received by whoever made the recording, not the usual 'splats' of non sync video feed cuts.
I wondered whether the arrangement might have been a bit like a BBC soft opt. BT Birmingham sent the TV-am feed on to Central as well as directly to the transmitters on the usual local ends used for incoming network programmes. Central genlock to that feed and put it on their main output. BT switch the transmitter circuits to Central, and once they're in circuit Central can cleanly mix through black to their own slide and music.
Pure speculation of course, and you couldn't imagine them going to the trouble these days, but back in IBA days they might have made the effort?
It's a good explanation and I can't think of anything better but as you say it seems like a lot of effort to go to. Also if that is what they did, where is the switch between the two? Even if, as one YouTube commenter (who's connected with Transdiffusion) says, Central was switched 'automatically' by then it's still very subtle on the clip, maybe it happened in the black and TVam faded their slide out at a pre-arranged time?
The two slides are the same, I assume that they differ in size because there was no way to make sure they were exactly the same size on different equipment - something that would be a lot easier today.
Incidently there was an IBA slide put out by TVam before they started as well. For some reason I've got a tape of the changeover from LWT to TVam one morning in 1987ish and the slide is visible very briefly between the two. At the time not every region was 24 hours so they would have seen it between their transmitters coming on and 6am.
I assume there was some dull IBA reason why they couldn't put a few seconds of black between the slide and TVam just to make it look a bit tidier, although they were on strike at the time it was probably a low priority
Incidently there was an IBA slide put out by TVam before they started as well. For some reason I've got a tape of the changeover from LWT to TVam one morning in 1987ish and the slide is visible very briefly between the two. At the time not every region was 24 hours so they would have seen it between their transmitters coming on and 6am.
I assume there was some dull IBA reason why they couldn't put a few seconds of black between the slide and TVam just to make it look a bit tidier, although they were on strike at the time it was probably a low priority
I do recall, from the outset of TV-am a blue IBA slide before 06:00am. In the TSW region the Tx woke up at about 05:30hrs with it, so I assume that BT switched the local ends away from TSW and to TV-am at some point in the small hours ?
The standard technique in those days was to shut down the transmitters, by removing syncs, and wake them up again by reapplying.
I suspect TV-am patched their output into the distribution network at a prearranged time, in order to 'wake up' the IBA transmitters. Probably sometime between 05:00hrs and 05:30hrs.
There's a video on TV-ark with something similar, and it's a handover from Thames to TV-am in February 1988. The clock hits six, and the switch is made, and u again just see a blue IBA slide saying TV-am starts at 06:00.
I've seen it used as a slide too, and of course it was used in lots of their presentation in the late 70's, early 80's including in cartoon form on their 'The Entertainers' trails
As that TVam clip above shows, used their building on-screen too
Never understood why Scottish TV did that though because their studios were nothing special and quite grotty frankly.
Conversely, Tyne Tees never did, but I've seen a couple of pictures of the antenna mast with the TTTV logo lit at night, and that could have made a decent occasional ident slide.
:-(
A former member
Its like Grampian never cared for the idents instead using there happy gang of CA. STV just like crashing in all over the place, and not using idents but instead using CA and there draft slides. but Yorkshire mainly used programme slides..
One reason it might have been done, I suspect, could be a fault with the normal STV ident slide.
Incidentally, when STV adopted the "thistle" logo in the mid 1980's, the slide for the news reports, called Newsbrief, had the word newsbrief, and the studios on them. May also have been the case with scotland today, or any news bulletins.