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COM7, COM8 and COM9 part II - which transmitters are "in group"

A list of which transmitters, if the proposed additional three multiplexes are provided, will require use of a wideband aerial.

A list of which transmitters, if the proposed additional three
published on UK Free TV

Following on from <img src="data:image/png;base64,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" class="xico" style="vertical-align:text-bottom" alt="www.ukfree.tv link icon"> link iconMore Freeview capacity - COM7, COM8 and COM9 - in the 600MHz band below is a table showing the list of transmitters and the proposed channel allocations for the proposed three new multiplexes.

Next to each allocation, in the "dB" column is the amount of signal loss that using the allocated "grouped" aerial for each transmitter will cause.

A value of 0, shown with a green background, denotes full power. A value down to -3dB with an orange background shows that a grouped aerial will probably work, and values in red of -4dB or lower are where a grouped aerial will block the signal.

There is a chart at the bottom of the page showing how various grouped aerials perform under the "reference ITC" model that Ofcom and Arqiva use.

Transmitters shown bold have the new multiplexes "in group", those totally "out of group" are shown in italic.

StationName com7 dB com8 dB com9 dB
Aberdare 32 0 34 0 36 0
Angus 31 -25 37 -4 36 -6
Beacon Hill 33 -15 34 -12 36 -6
Belmont 33 0 35 0 36 0
Bilsdale 31 0 37 -2 36 0
Black Hill 32 -3 35 -3 36 -2
Blaenplwyf 31 0 37 -2 36 0
Bluebell Hill 32 -2 34 -2 36 -2
Bressay 31 0 37 -2 36 0
Brierley Hill 31 -25 37 -4 36 -6
Bristol Ilchester Crescent 33 -3 35 -3 36 -2
Bristol Kings Weston 33 -3 35 -3 36 -2
Bromsgrove 33 0 35 0 36 0
Brougher Mountain 31 0 37 -2 N/A
Caldbeck 32 0 35 0 36 0
Caradon Hill 31 0 37 -2 36 0
Carmel 32 -20 35 -9 36 -6
Chatton 32 -3 35 -3 36 -2
Chesterfield 32 0 34 0 36 0
Craigkelly 33 0 34 0 36 0
Crystal Palace 33 0 35 0 36 0
Darvel 31 0 37 -2 36 0
Divis 33 0 34 0 36 0
Dover 33 -15 35 -9 36 -6
Durris 32 0 35 0 36 0
Eitshal 33 0 34 0 36 0
Emley Moor 32 -3 34 -3 36 -2
Fenham 31 0 37 -2 36 0
Fenton 32 0 34 0 36 0
Guildford 33 -3 35 -3 36 -2
Hannington 32 -2 34 -2 36 -2
Hastings 32 0 34 0 36 0
Heathfield 32 -20 34 -12 36 -6
Hemel Hempstead 31 -3 37 -2 36 -2
Huntshaw Cross 33 -15 34 -12 36 -6
Idle 33 0 35 0 36 0
Keelylang Hill 33 -3 34 -3 36 -2
Keighley 31 -25 37 -4 36 -6
Kilvey Hill 31 0 37 -2 36 0
Knockmore 33 0 34 0 36 0
Lancaster 33 0 34 0 36 0
Lark Stoke 32 0 34 0 36 0
Limavady 32 -20 35 -9 N/A
Llanddona 32 -20 35 -9 36 -6
Malvern 31 -25 37 -4 36 -6
Mendip 33 -15 35 -9 36 -6
Midhurst 31 -25 37 -4 36 -6
Moel Y Parc 32 -3 34 -3 36 -2
Nottingham 31 0 37 -2 36 0
Olivers Mount 32 -20 34 -12 36 -6
Oxford 31 -25 37 -4 36 -6
Pendle Forest 33 0 35 0 36 0
Plympton 32 -20 35 -9 36 -6
Pontop Pike 33 -15 34 -12 36 -6
Pontypool 31 0 37 -2 36 0
Presely 32 -3 35 -3 36 -2
Redruth 33 -3 34 -3 36 -2
Reigate 33 -15 35 -9 36 -6
Ridge Hill 32 0 34 0 36 0
Rosemarkie 31 -3 37 -2 36 -2
Rosneath VP 33 -15 34 -12 36 -6
Rowridge 31 0 37 -2 36 0
Rowridge VP 31 0 37 -2 36 0
Rumster Forest 32 0 35 0 36 0
Saddleworth 31 -3 37 -2 36 -2
Salisbury 31 -25 37 -4 36 -6
Sandy Heath 32 0 34 0 36 0
Selkirk 31 -25 37 -4 36 -6
Sheffield 31 0 37 -2 36 0
Stockland Hill 32 0 37 -2 36 0
Storeton 31 0 37 -2 36 0
Sudbury 31 -3 37 -2 36 -2
Sutton Coldfield 33 -3 35 -3 36 -2
Tacolneston 31 -25 37 -4 36 -6
The Wrekin 33 0 35 0 36 0
Torosay 31 0 37 -2 36 0
Tunbridge Wells 31 -3 37 -2 36 -2
Waltham 31 -25 37 -4 36 -6
Wenvoe 31 -3 37 -2 36 -2
Whitehawk Hill 33 -15 35 -9 36 -6
Winter Hill 31 -25 37 -4 36 -6






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Comments
Monday, 26 September 2011
C
Charles Stuart
10:22 PM

My idea was that if they convert from DVB-T to DVB-T2, I guess that they need to build new transmitters. If they're building new transmitters, why not reallocate the frequencies to the same, more efficient model that will be used for COM 7 & 8? If you can change five frequencies per multiplex to three per multiplex, why not do it to create more multiplexes or to clear some frequencies for other use? (52.3992,-0.7201) 

link to this
Charles Stuart's 131 posts Silver Silver GB
Briantist
11:23 PM

Charles Stuart: No new masts are built for COM7, COM8 and COM9, the equipment will be placed lower down the existing structures.


You can't reallocated PSB1, PSB2 and PSB3 as they are on ALL transmitters, not just the "main 80", and COM4, COM5 and COM6 use frequencies that fit in with the existing pattern and (almost always) are "in group", as per:




COM7, COM8 and COM9 will always be at lower power levels that COM4, COM5 and COM6.

link to this
Briantist's 38,591 posts Owner Owner GB
Tuesday, 27 September 2011
A
Adrian Morris
2:33 PM Billingshurst

Hi. Am trying to get my head around this. I'm on Midhurst transmitter on my old c/d group aerial and this seems to suggest that I wouldn't be able to get the com 7-9 multiplexes even with a wideband aerial.

Would one need a second aerial and then combine the signal?

Thanks,
Adrian Morris
RH14 0SQ

link to this
Adrian Morris's 2 posts GB
Adrian's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
Briantist
3:42 PM

Adrian Morris: At Midhurst you need a wideband aerial, as COM7, COM8 and COM9 will all be "out of group". A C/D aerial will block COM7, COM8, COM9.

link to this
Briantist's 38,591 posts Owner Owner GB
M
mad tony
7:54 PM Leeds

Why can't my folks not get BBC red button via their outside aeriel and integrated tv (Emley Moor) yet they can on a portable TV and built in aeriel with a set top box (East Yorks and Lincs BBC1)

link to this
mad tony's 1 post GB
mad's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
Briantist
8:10 PM

mad tony: Not all devices have the "MHEG-5" system required for Red Button to work. It was OK in the past, you probably just need to do this - <img src="data:image/png;base64,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" class="xico" style="vertical-align:text-bottom" alt="www.ukfree.tv link icon"> link iconMy Freeview box has no EPG, is blank on FIVE, ITV3, ITV4, ITV2+1, has no sound or the channel line up is wrong | ukfree.tv - independent free digital TV advice .

link to this
Briantist's 38,591 posts Owner Owner GB
Thursday, 29 September 2011
P
Peter
8:42 AM

Brian,

I get Freeview from the Whitehawk transmitter using (I believe) a group C/D aerial and can get all current multiplexes.

With the signal loss predicted -15 to -6 dB, and after the power increase at DSO, won't the resultant signal levels on COM7, COM8 and COM9 be very similar to those I currently get?

Regards

link to this
Peter's 18 posts GB
Briantist
2:58 PM

Peter: No, you will need a wideband aerial.

link to this
Briantist's 38,591 posts Owner Owner GB
P
Peter
3:38 PM

Brian: Thanks - I'll wait, though, until something more definite happens about the use of COM7-9 before I replace my current aerial.

link to this
Peter's 18 posts GB
Briantist
4:10 PM

Peter: Yes. The point about the post was to say that "if you get a new aerial..." rather than change it now.

link to this
Briantist's 38,591 posts Owner Owner GB
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