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Interleaved Frequencies maps (old ones)

Maps of the Interleaved Frequencies coverage areas for the UK transmitters

Maps of the Interleaved Frequencies coverage areas for the UK t
published on UK Free TV

These are the maps, supplied by Ofcom, showing the coverage areas for the "Interleaved Frequencies" than can be used for the Freeview Local TV service.

The green areas have good predicted coverage for the "Interleaved Frequencies", yellow is possible coverage.

Note: these areas are considerably different from the normal Freeview coverage for each transmitter.

Update: Ofcom introductory comments

The study considered frequency channels -5 below and +2 above the receive aerial group for the station. Though for the 10 largest stations all channels were considered.

The ERP of main stations has been set at 10kW and relay stations at 1kW. It should be noted that in several cases these powers result in a higher ERP than allocated to the main multiplexes.

Coverage of the chosen channel has been assessed on the basis of the derived template and the use of a 64QAM 2/3 modulation scheme. Availability of mast aperture, mast loading and building space to support the required antennas and house transmitters was not investigated.

Coverage calculations are based on existing broadcast stations and reception via fixed roof top aerials.

The derived UK median templates are designed to protect populated coverage derived by the median method. The derived UK continental templates include Irish and Continental restrictions based on 23dB?V/m at the border.

The exercise has been based on version 5.51 of the UK digital plan and an interpretation of the GE-06 frequency plan for Europe. Coverage of each interleaved channel is quoted in isolation, i.e. only that channel and the v5.5 plan have been considered.

As coverage is based on the template at the planned height and at the maximum ERP, coverage using implemented antennas, heights and actual ERP will be lower.


Crystal Palace





The Interleaved Map for the transmitter is created from three elements. The left circular image shows the UK post-switchover use of the same frequency, the central circular image is the Continental use of the same frequency. These are subtracted from the "normal" coverage area for the transmitter, the right hand image, to create the "Interleaved Frequency" coverage area.



Winter Hill



Black Hill



Sutton Coldfield



Pontop Pike



Emley Moor



Bilsdale



Rowridge



Waltham



Craigkelly



Wenvoe



Belmont



Hannington



Divis



Tacolneston



Sandy Heath



Mendip



Sudbury



Oxford



The Wrekin



Dover



Ridge Hill



Caldbeck



Durris



Angus



Limavady



Knockmore



Rosemarkie



Hemel Hempstead



Brierley Hill



Bromsgrove



Kidderminster



Storeton



Sheffield





Guildford



Reigate



Tunbridge Wells



Malvern



Lark Stoke



Fenton



Pendle Forest



Saddleworth



Lancaster



Keighley



Kilvey Hill



Salisbury



Poole



Whitehawk Hill



Fenham



Bristol Kings Weston



Bristol Ilchester Crescent



Nottingham



Llanddona



Carmel



Olivers Mount



Luton



Midhurst



Preseli



Caradon Hill



Plympton



Stockland Hill



Beacon Hill



Huntshaw Cross



Redruth



Moel Y Parc



Brougher Mountain



Darvel



Rosneath



Bluebell Hill



Londonderry



Heathfield



Selkirk



Bressay



Torosay



Perth



Tay Bridge



Keelylang Hill



Rumster Forest



Eitshal



Balgownie



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Comments
Tuesday, 8 March 2011
Ash
9:06 AM
Kingston Upon Thames

Hi there, out of interest what software do you use to map those maps?

link to this comment
Ash's 1 post GB flag
Ash's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
Briantist
sentiment_very_satisfiedOwner

10:02 AM

Ash: As above, they are from Ofcom, provided to them by NGW, now part of Arqiva.

The transmission companies employ a "standard model" which they use, it it isn't a package you can buy.

You can always write your own, as I have done.

link to this comment
Briantist's 38,915 posts GB flag
A
AncientFootsteps
12:40 PM

Are you sure about your interpretation of Yellow and Green coverage?
Yellow = good
Green = possible
PS Many thanks for all your sterling efforts here (and elsewhere)

link to this comment
AncientFootsteps's 3 posts GB flag
Briantist
sentiment_very_satisfiedOwner

1:28 PM

AncientFootsteps: Yes, I think that a good summary of 90%+ and 70%+ .

link to this comment
Briantist's 38,915 posts GB flag
M
Mike Dimmick
sentiment_very_satisfiedPlatinum

5:30 PM
Reading

Hmm - maybe that's why Reading/Hannington wasn't on your original list! The coverage area manages to miss Reading, Basingstoke, Wokingham, Bracknell - basically all the large towns. They haven't plotted Newbury's borders, but I think it would fall short of covering the whole town.

It's pretty good for Andover, but that's not very big.

link to this comment
Mike Dimmick's 2,486 posts GB flag
Mike's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
Ash
8:25 PM

@Briantist I should have read your first paragraph, doh!

PS: I know about the transmission companies standard model, just wasn't familiar with the old NGW plots :-)

link to this comment
Ash's 6 posts GB flag
woodface
sentiment_satisfiedBronze

8:51 PM

Fascinating. Them thar hills can really cause some huge blind spots. Some main stations only seem to serve a fraction of the 360 degrees around them. (Though doubtless that's intentional in some cases).

Nice to compare these figures with the reception predictor at Digital UK - When do I switch?

In the box on the right, ensure you tick the tiny box "I am in the aerial installation trade". Enter the postcode for anywhere you're interested in - not just your home.

The tables show detailed estimates of your chances of seeing distant tx / neighbouring TV regions, now and at the various stages of switchover.

I still have hopes of seeing Moel-Y Parc and Emley Moor here in Granadaland.

Hover your mouse over the column headings for definitions of reception quality.

link to this comment
woodface's 39 posts GB flag
J
Jordy
sentiment_satisfiedGold

11:25 PM

Do we have any rough ERP's to go on?... If the information is taken at face value in the NGW pdf's.

Then for example Brougher is set for 30dBw, i wouldn't think the gain figures are published anywhere but if a dipole antenna with a minimum gain of 2.15 dBi that would provide a rough ERP of 1100 watts.

Take Divis at 40 dBw we would be looking 10000 watts which is vast;y under powered compared with initial estimates based on 30Kw. Some of the radiation patterns look very restricted...

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Jordy's 1,827 posts GB flag
Wednesday, 9 March 2011
Briantist
sentiment_very_satisfiedOwner

6:10 AM

Jordy: I've changed the top article to reflect the information provided by Ofcom.

The radiation patterns are intentionality restricted, that's why they are "Interleaved Frequencies". I've posted the example of the Crystal Palace at the top of the article too.

BROUGHER MOUNTAIN and DIVIS - Max ERP: 40 dBW

link to this comment
Briantist's 38,915 posts GB flag
Briantist
sentiment_very_satisfiedOwner

6:13 AM

woodface: It's not the hill, these are Interleaved Frequencies so the restrictions are to prevent interference with UK and Continental transmitters using the same frequencies.

Do not confuse these with the normal multiplex radiation patterns.

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Briantist's 38,915 posts GB flag
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