All posts by Briantist
Below are all of Briantist's postings, with the most recent are at the bottom of the page.
Andrew Harris: If you were unable to get the analogue service, then you will not be provided with the digital one.
A radiation pattern is the configuration put on a digital broadcast - usually in one or five degree segments - to restrict the output levels in certain places. You see see some on the BBC FOI transmitter data - first draft | ukfree.tv - independent free digital TV advice page.
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All: Your problems will be down to the weather conditions over France - see What is the Inversion Effect and why does it effect my Freeview TV reception?
| ukfree.tv - independent free digital TV advice .
This will occur until the whole network is digital, when it should only occur occasionally.
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Hailai: Please see Freeview reception has changed? | ukfree.tv - independent free digital TV advice .
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Mike: Probably the best thing to do is to tune the multiplexes from whichever transmitter you are using manually.
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Chris Wilson: Yes, some people do, but others have to wait until September 2011, when the power increases on the three commercial multiplexes.
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Phil: Can't really be precise without your postcode. Please see Single frequency interference | ukfree.tv - independent free digital TV advice for general advice.
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Stuart O.: Some answers
1) As stated above HP and VP are Horizontal Polorization and Vertical Polorization. A very small number of transmitter broadcast both ways. This is usually to provide a standard service area at "normal power" and a link to a relay transmitter in a restricted direction. However, after switchover Rowridge is going to do this at quite high power.
2) The mast are the same, just two transmitter element on the same mast set in different polorisations.
3A) Fenton is a relay of Sutton Coldfield in the analogue plan, but all the 81 Freeview transmitters are directly fed with their services using the fibreoptic network, so in effect it is not a relay in the digital network. The equipment at Fenton is able to take second- and third- feeds as backups for analogue services, so it can use the fibreoptic delivered Freeview to provide the analogue if the main feed is damaged, and can revert to a satellite-based backup as a backup-backup.
3B) Nottingham, Fenton, Bromsgrove and Lark Stoke were all relays themselves in the analogue plan, but as I said above the 81 full-Freeview transmitters are fed by the fibreoptic network so are not digital relays.
4) Sutton Coldfield was the original transmitter in the "Central" area when 405-line VHF television could cover a very large area. When UHF was introdued colour 625-line services, the signals do not travel over the horizon in the same way, and additional masts were required at The Wrekin and Ridge Hill to provide service in these areas. The "Central" area originally went as far south as Oxford, and as far east as Nottingham. TV regions shapes are function of the landscape, not "political borders".
5) The relays were historically provided to fill in coverage holes as they were discovered. When they were provided, the current prevaling "correct region" was used. This has led to some strange things happening over time.
6) It is easier to build a second relay than to make and existing one taller.
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Al: The commercial operators do not regard this mast as a profitable one to broadcast from.
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Friday 22 April 2011 4:23PM
Steve: That's a marking company, they don't do the broadcasts.