Please is anyone able to explain in not-too-technical terms (for I am but a simpleton) what the barriers are to having all ITV regions/sub-regions on ITV HD on Freeview as-yet?
Please bear in mind that I don't really know exactly what things like a "MUX" or "transponder" (etc) are - I certainly couldn't "draw a picture of what one looks like", if provided with a pencil & paper and instructed to do so!
In my head, Terrestrial is surely the one platform where having all the correct regional variants should present little/no problems? Given that each transmitting mast (and/or relay thereof) is in a different geographic location, and any "antennas" (or whatever) mounted thereupon logically carry the the appropriate SD region for that location, why is the same not automatically true for HD?
There's clearly a lot that I don't understand about how these things work.
The reason I'm not also asking the same about BBC One HD English Regions is because I understand that Auntie Beeb is obliged to be "platform neutral" (correct?).
I therefore have reasoned that if, for example, Freeview is already fully technically capable of carrying all BBC One HD English Regions (& sub-opts), but any/all other platform(s) aren't so, then Auntie Beeb has to be seen to be treating all English/Manx/CI licence fee payers the same regardless of which platform they're watching BBC One HD via (correct?).
The BBC/Atos are appointed by Ofcom to manage the code and muxing of the PSB 3 mux, (commonly known as 'The HD mux').
PSB 3 carries different configuartions depending upon region and transmitter. ITV, STV, UTV, C4, and C5 all have to deliver their HD channels to the Beeb, for the muxing.
Scottish transmitters carry a version of the mux that includes HD versions of BBC 1 Scotland, BBC 2 England, STV, C4, C5.
English transmitters all carry BBC 1 HD England  BBC 2 HD England, a nominated ITV HD region, C4 HD and C5 HD.
I lose track but there are now fewer ITV HD regions on DTT
than on satellite. For ITV to mirror their HD regions with satellite, would require asking the BBC to produce more English regional variations of PSB 3.
Technically very possible, but ITV would have to pay the Beeb/Atos to equip the code and mux centres accordingly, as well as backhauling the extra ITV regions to them.
The same constraints apply to the BBC 1 HD English regions, and BBC 2 HD Nations.
The BBC Trust have now earmarked that to happen I think, that will ease the pain for ITV too (as the reverse situation would for the BBC).
However, as someone pointed out in another forum, with DSO 2 looming, it might well
be that ITV HD will end up on a different mux, so ITV's apparent reluctance to invest in extra kit
to make more HD regions available on DTT might be because of that.
 The version of BBC 1 HD that has the Red Screen of Death during regional opts
All transmitters carry the appropriate regional versions of BBC and ITV on SD, simply because the centralised code and mux centres for PSB 1 and 2 are fully equipped to do so
The days of the local transmitter being directly fed from the regional centre are long gone.
Last edited by Markymark on 1 December 2016 9:42am - 2 times in total