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TV Breakdown Appreciation Thread

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CO
Coronavision Recently warned
Yes, I've seen videos of Robin Houston doing a late Thames bulletin and introducing the next programme.

Makes perfect sense, in most regions there was no point having an announcement into the local news as the local news shared a name with the station!


YTV did much the same thing


Most of the short bulletins were very basic in that era across most of the ITV companies.
Last edited by Coronavision on 14 August 2020 2:11am
CO
commseng London London
Agreed that it appears to be both analogue and digital faults here, so by June 2001 for the Tyne Tees clip, would it have been a digital circuit feeding the analogue transmitter?
The breakup looks like a decoder losing lock, which may have been then upsetting the timing of the analogue video that went into the transmitter's input.
Pres commented that it was outside their control, so an external supplier is hinted at - which would tie in with that.
Lewismpsmith and Inspector Sands gave kudos
MA
Markymark Meridian (Thames Valley) South Today
Agreed that it appears to be both analogue and digital faults here, so by June 2001 for the Tyne Tees clip, would it have been a digital circuit feeding the analogue transmitter?
The breakup looks like a decoder losing lock, which may have been then upsetting the timing of the analogue video that went into the transmitter's input.
Pres commented that it was outside their control, so an external supplier is hinted at - which would tie in with that.


What's interesting if you freeze the video in the right places, is you can see VITC timecode (rather than teletext) in the VBI. The transmitter feed would have contained a line of teletext pulses (for 6xx pages) and ITS, and I'd have expected any VITC to have been stripped off way upstream of that ?
CO
commseng London London
Maybe they didn't blank the VITC and relied instead on it being blanked by other kit at the transmitter PIE - that it can only be seen briefly during the fault may suggest that.
Odd not to have removed it earlier though!
AA
aaronspence
Suspect Derren Brown will fall off air tonight on C4, lots of breakup due to heavy rain.
JB
JasonB London London
Suspect Derren Brown will fall off air tonight on C4, lots of breakup due to heavy rain.


Most likely will be rehearsed and part of his 'act'
Have you washed your hands?
TE
tesandco Founding member Granada North West Today
On that Tyne Tees fault, part of me has a feeling there was something that had appeared onscreen before I'd been able to scramble together the recording blaming weather which is where I got that from for the original synoposis. Could of course just have been all they had available and not actually the reason mind. Or could even just be a Nelson Mandela effect thing now as this was 19 years ago!

Teletext data going out from Pontop seems to be fairly normal mind, so that part at least was still working right.
* *
TV Whirl - Still covering UK idents, presentation, teletext and programmes after 19 years
MA
Markymark Meridian (Thames Valley) South Today
P600-699 were generated at the studios, unlike Teletext Ltd P100 to 599 that were generated at the primary Tx site (in this case Pontop) So it's interesting the 600 page is still there
TE
Technologist London London
But in a digital link the Teletext would be coded separately from the video ( and audio)
MA
Markymark Meridian (Thames Valley) South Today
But in a digital link the Teletext would be coded separately from the video ( and audio)


Yes. Good point Mr T. And probably carried in a transparent data channel, because you wouldn't want to be applying any compression to the teletext pulses,
TE
Technologist London London
Yes ......it takes I seem to remember about 25Mbit/s MPEG2 to encode 16 Line pairs of Teletext
which 45/40 times 256Kbit/sec as a data stream say 290Kbit/sec
I actually had to test this - as a company who wanted to have a link which used Thomson MPEG 2 coders
which only deal with 12 Line pairs... BBC Needs 16 Line pairs
so they found a cheaper Coder which could code the VBI ( not as silly as you think - as ITS may need to be encoded)
But as the link was not "big enough" for a 34Mbit/sec ETSI coder which is why MPEG 2 was being used .....
this was not a viable solution!!!!
SP
Steve in Pudsey Yorkshire Look North (Yorkshire)
Not the most interesting breakdown ever (or at least not the part of it shown in this clip) but it is slightly notable in being a live programme from TV Centre falling off air, which was a rarity.

Write that down in your copybook now.

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