TV region maps now show network connections and transmitter types
Brian Butterworth published on UK Free TV I have been considering this for a while, and I suspected it would be one of those "data entry on a rainy day" things to do - manually update the database so the UK Free TV mapping pages show the connections between the transmitters.
Using the information from the Transmitter Network - Digital UK Almanac I have updated the system to show the links between the transmitters, for example:
These are available for all switched-over regions, plus Oxford, minus (for some unspecified reason) the Carmel group in Wales and the Torosay and Selkirk groups in Scotland. Also missing is Stockland Hill in England.
If anyone has the Carmel, Torosay, Stockland Hill or Selkirk information, please let me know!
In addition, a separate symbol is now used to denote "Freeview Light" transmitters that only carry the public service multiplexes BBCA, D3+4 and BBCB, or will do after they have switched-over.
Your feed back is, as always, appreciated.
All questions
In this section
Saturday, 10 September 2011
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Matt1:13 PM
Godalming
Absolutely amazing Brian - how do you do it?
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Matt's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
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Steve P4:18 PM
Matt - Brian is certainly amazing, but I'm pretty sure the scaling feature comes with the mapping software!
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Steve P: The map zooming in and out is part of the interface, the overlays I have to do myself, mainly because the maps are in a different co-ordinates system to the underlying database - see Convert between Latitude/Longitude & OS National Grid Reference points .
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Matt: It's not too hard when you know how - Google Maps Javascript API V3 Basics - Google Maps JavaScript API V3 - Google Code ...
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Thursday, 15 September 2011
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anthony6:24 PM
Barnsley
hi since the first stage of switch over 2 of my set top boxes have lost bbc channels i have retuned lots of times but they wont work what could the problem be
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anthony's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
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Mike Dimmick7:12 PM
anthony:
1. They might not support 8K mode - check http://www.digitaluk.co.u…ment for a list of some known not to work
2. They might not support the larger NIT - check http://www.digitaluk.co.u…tnit
3. You could be suffering from Digital Region Overlap, where the box tunes into the first version it finds rather than the best quality. Strong signals will be found from Belmont first, then Sheffield, then Emley Moor. Check for other versions in the 800s - if they work better then do a manual retune.
4. You could have too much signal, making the Emley Moor signal too distorted to receive reliably. This would usually cause a box to choose one of the other transmitters instead, if strong enough to decode, but it might pick based on signal strength rather than quality.
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Mike Dimmick7:16 PM
Briantist: Going back to the symbols used in the DUK documents - they use a hexagon for a 6-mux full-service transmitter and a triangle for a 3-mux Freeview Light transmitter.
The dotted lines are probably to do with Service Insertion Points, that Emley Moor and Sutton Coldfield are the SIPs for the West Yorkshire and West Midlands subregions respectively.
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Mike Dimmick: Yes, I was just looking at transmitter symbol on my desktop and wondering what to do about them again.
I spoke with Digital UK and they said that the dotted lines mean that the services are distributed using what I was called "the SDH network" - they are fixed-bitrate "direct connections" that are diversely routed through the national fibre-optic networks, the ones that provide the POTS, synchronous and non-synchronous datanetworks nationwide.
They are, in effect, direct virtual connections. To that end I have put them on the maps as pink lines from the main transmitter.
I was thinking that they should probably link back to a regional multiplexing centre, but I'm not sure if this is done centrally in London or if the statmux devices are in regional broadcast centres. I should probably just ask someone at Arqiva...
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Sunday, 25 September 2011
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davd5:06 PM
Is the salisbury tv transmitter digital fed by off air cable or sat?
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Wednesday, 28 September 2011
davd: All full service transmitters are fed by fibre-optic. No transmitters are served by satellite, except in emergency situations where the BBC services can be provided this way.
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