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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 More 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
Sunday, 25 September 2011
A
A Foster
5:31 PM
Norwich

i'm get freeview from the Tacolneston transmitter using a group C/D aerial, on the north side of Norwich. I was told by the help scheme that this aerial would be adequate for all services, but with the announcement of the new multiplexes, it would seem that I've been misled.

link to this comment
A Foster's 4 posts GB
W
Will
sentiment_satisfiedBronze

5:42 PM

Is the SFN on C36 not going to be transmitted from Durris?

link to this comment
Will's 39 posts GB
Briantist
sentiment_very_satisfiedOwner

5:57 PM

Will: No, due to the border with the RoI, the UK-wide SFN cannot be broadcast from Durris or Limavady.

link to this comment
Briantist's 38,844 posts GB
Briantist
sentiment_very_satisfiedOwner

6:02 PM

A Foster: Yes, that is correct, if you want to use these services when they launch, you will need a wideband aerial.

Actually, looking at the data, you may also need a wideband aerial to receive SDN and ArqA after switchover, but as they are only "just" out of group and you are in a very strong signal area, you will probably be OK.

The official advice for the last decade or so has been that you should fit a wideband aerial if you upgrade, but there is no need to fit a replacement for access to the "public service" multiplexes.

Most transmitters also have the COM multiplexes "in group" after switchover, but not all.

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Briantist's 38,844 posts GB
D
David
7:11 PM
Coalville

How can Durris signals from NE Scotland interfere with the ROI?

link to this comment
David's 1 post GB
Briantist
sentiment_very_satisfiedOwner

8:17 PM

David: I'm really sorry, I made a copy and paste error. It's Brougher Mountain, not Durris, that goes along with Limavady to be not part of the SFN.

link to this comment
Briantist's 38,844 posts GB
Briantist
sentiment_very_satisfiedOwner

8:19 PM

Will: The correct answer is yes, it's Brougher Mountain and Limavady that won't have the SFN.

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Briantist's 38,844 posts GB
Monday, 26 September 2011
C
Charles Stuart
sentiment_satisfiedSilver

2:15 PM

This is just a theoretical question because it interests me. I guess that eventually the five DVB-T munltiplexes will be converted to DVB-T2. When that happens, could they be reconfigured to create eight new multiplexes and a leftover frequency that could be used for other purposes?

Another idea I've had is that when the first of COM 7,8 or 9 opens, one of the existing multiplexes could be transferred to enable a truly local television service, along the lines of ITV when it first started but with local, rather than regional franchises and much more local content in each franchise area. (52.3992,-0.7201) 

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Charles Stuart's 159 posts GB
Briantist
sentiment_very_satisfiedOwner

6:52 PM

Charles Stuart: When the existing five multiplexes are converted to DVB-T2 they will use the same plan as now with DVB-T. I'm not sure why you think there would be anything "left over"?

Local television is being provided on Interleaved Frequencies - see Local TV on Freeview - new Ofcom maps | ukfree.tv - independent free digital TV advice . COM7 or COM8 could, in theory, be used for local services, COM9 can't as it's a national SFN.

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Briantist's 38,844 posts GB
C
Charles Stuart
sentiment_satisfiedSilver

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) 

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Charles Stuart's 159 posts GB
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