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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.

StationNamecom7dBcom8dBcom9dB
Aberdare320340360
Angus31-2537-436-6
Beacon Hill33-1534-1236-6
Belmont330350360
Bilsdale31037-2360
Black Hill32-335-336-2
Blaenplwyf31037-2360
Bluebell Hill32-234-236-2
Bressay31037-2360
Brierley Hill31-2537-436-6
Bristol Ilchester Crescent33-335-336-2
Bristol Kings Weston33-335-336-2
Bromsgrove330350360
Brougher Mountain31037-2N/A
Caldbeck320350360
Caradon Hill31037-2360
Carmel32-2035-936-6
Chatton32-335-336-2
Chesterfield320340360
Craigkelly330340360
Crystal Palace330350360
Darvel31037-2360
Divis330340360
Dover33-1535-936-6
Durris320350360
Eitshal330340360
Emley Moor32-334-336-2
Fenham31037-2360
Fenton320340360
Guildford33-335-336-2
Hannington32-234-236-2
Hastings320340360
Heathfield32-2034-1236-6
Hemel Hempstead31-337-236-2
Huntshaw Cross33-1534-1236-6
Idle330350360
Keelylang Hill33-334-336-2
Keighley31-2537-436-6
Kilvey Hill31037-2360
Knockmore330340360
Lancaster330340360
Lark Stoke320340360
Limavady32-2035-9N/A
Llanddona32-2035-936-6
Malvern31-2537-436-6
Mendip33-1535-936-6
Midhurst31-2537-436-6
Moel Y Parc32-334-336-2
Nottingham31037-2360
Olivers Mount32-2034-1236-6
Oxford31-2537-436-6
Pendle Forest330350360
Plympton32-2035-936-6
Pontop Pike33-1534-1236-6
Pontypool31037-2360
Presely32-335-336-2
Redruth33-334-336-2
Reigate33-1535-936-6
Ridge Hill320340360
Rosemarkie31-337-236-2
Rosneath VP33-1534-1236-6
Rowridge31037-2360
Rowridge VP31037-2360
Rumster Forest320350360
Saddleworth31-337-236-2
Salisbury31-2537-436-6
Sandy Heath320340360
Selkirk31-2537-436-6
Sheffield31037-2360
Stockland Hill32037-2360
Storeton31037-2360
Sudbury31-337-236-2
Sutton Coldfield33-335-336-2
Tacolneston31-2537-436-6
The Wrekin330350360
Torosay31037-2360
Tunbridge Wells31-337-236-2
Waltham31-2537-436-6
Wenvoe31-337-236-2
Whitehawk Hill33-1535-936-6
Winter Hill31-2537-436-6






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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 141 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 38,562 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 38,562 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)

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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 - My 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 38,562 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 38,562 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.

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Briantist's 38,562 posts Owner Owner GB
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