All posts by Briantist
Below are all of Briantist's postings, with the most recent are at the bottom of the page.
Jane williams: Basically, this isn't going to happen. The Freeview Local TV services are on dedicated "beams" that restrict the broadcast area to deliberately small areas. The Birmingam service is broadcast only from two masts: to the south west of Sutton Coldfield and to the west of Brierley Hill.
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Tim: In simple terms, the bitrate you can achieve for transmission is a function of the frequency used.
This means that when you move from MHz down to kHz, you also move down a factor of about 10 in terms of usable bitrate. For this reason, the "old" VHF TV frequencies have been reused for several services including DAB.
See DAB multiplexes - it shows the old VHF TV channels 10, 11 and 12 broken into 12 lots of blocks (10A, 10B, 10C, 10D up to 11D).
In each DAB block you get 1,184 kbps - compared with the UHF "BBCB DVB-T2 multiplex" which has 40 Mbps, which is 33 TIMES more.
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Ian: "Due to the large number of radio transmitters, many have been grouped into counties or administrative areas for ease of viewing. " - click on the group symbol as it says.
It links to Map of all DAB transmitters in Linconshire
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Willie Bone: You are correct Ballentrae is not on the BBC list - http://downloads.bbc.co.u….pdf - so it has come from the list of planned "local radio" relays.It is listed (in "case 4") for the Glasgow and South West Scotland 11C Block http://stakeholders.ofcom….pdf
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MikeG:Just to play devil's advocate here for a moment.
If I was one of the telecom's companies looking at the UK digital terrestrial system I think I would see that the system is highly inefficient.
For one, there are only five TV channels with regionalized content, but spread over three multiplexes.
For two, there are several channels that being broadcast in both standard and high definition format AND an hour later on +1.
For three, nationwide multiplexes broadcast in DVB-T2 can use single frequency networks.
For four, the older multiplexes are only providing 24Mbps, the DVB-T2 ones are 40Mbps.
So: put the public service channels together on a single multiplex in DVB-T2. That will need a multi-frequency network taking up 5 UHF channels, say C21-C25.
Switch four of the other multiplexes to DVB-T2, moving from 96Mbps (4 x 24) to 160Mbps (4 x 40). All using single frequency networks say C26- C29.
Keep the sixth DVB-T2 for new TV channels: C30.
That means you can use C31-C60 for 4G broadband.
All the current services in high definition. Doable in 5 years.
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V. Travis: "Dog Hill BBC Digital TV Off Air from 09:00 today" so you will need to wait for the fault to be fixed. Do not retune!
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paul denning: Has this just happened? You could have a look at Single frequency interference
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Peter: Yes, VIVA is on 57. Also Local TV in Scotland and Wales has moved to 23. ITVBe +1 is still showing on 72 for me here (and checked with DMOL)
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Peter: VIVA weekly reach 758,000 with 0.03% of viewing. ITVBe+1 weekly reach 719,000 with 0.04% of all viewing.
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Friday 23 October 2015 6:36AM
michael : I'm not sure what you mean by "far less useful information than the former format" as they have 100% the same information in them. Can you please explain what you think is missing?