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04-08-2008, 00:28   #1
Scottish paddy
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ComReg list of DTT transmitters & frequencies.

Saw this on Comreg site.
Quote:
Licensing Digital Terrestrial Television
40 ComReg 07/65
Appendix A – List of Transmission sites
The following, List A and List B, are sites where suitable DVB-T frequency
assignments have been identified. International co-ordination is currently in process
for List A and List B sites, final technical details are not known at the time of this
publication. The frequency assignments listed come from Ireland’s GE06 frequency
plan. Multiplexes (MUX) 1 to 4 are indicated.

LIST A - Main Transmitters MUX 1 - 4
Cairn Hill 41 44 47 51
Clermont Carn 53 57 60 63
Holywell Hill 25 30 32 35
Dungarvan 55 59 62 65
Kippure 54 58 61 64
Maghera 55 48 67 65
Mt Leinster 39 42 45 49
Mullaghanish 21 24 25 28
Spur Hill 45 49 66 68
Three Rock 54 58 61 64
Truskmore 52 56 53 57
Woodcock Hill 41 44 47 51

LIST B MUX 1 - 4
Achill 41 44 47 51
Aranmore 41 44 47 51
Casla 41 44 47 51
Castlebar 22 25 28 32
Castletownbere 55 59 62 65
Clifden 23 26 29 33
Clonmel 55 59 62 65
Crosshaven 45 49 66 68
Drogheda 21 24 27 31
Kilduff 53 57 60 63
Fanad 55 59 62 65
Falcarragh 22 25 28 32
Greystones 52 56 66 68
Iorras 22 25 28 32
Kilkeeveragh 41 44 47 51
Knockmoyle 52 56 66 68
Letterkenny 53 57 60 63
Suir Valley 52 56 66 68
There are more sites noted, but without channel numbers.
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04-08-2008, 00:38   #2
byte
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Thanks for list.

I'm curious about Truskmore though. Using 52, 53, 56 and 57. Seems strange having the frequencies so close together, something that couldn't happen with analogue!

I can see trouble for installations that use certain A/E combiners for reception from Brougher and Truskmore. Some Triax 5153 model for example, the "E" side goes from C53-C69, so rejection for C52! Nothing a new combiner won't fix though
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04-08-2008, 05:05   #3
lucernarian
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I saw that list before, and I think it was referenced to before. Thanks for posting that list.

What alarms me is the bit about Drogheda broadcasting on the same frequencies as Divis, albeit on vertical polarisation.

Still, for those living in the town and south of it, the polarisation will not matter, the Divis signal will be completely overwhelmed. And the somewhat more common setup for NI TV to come from Kilkeel, the high gain amps and grid aerials used for this might have issues dealing with 130 watts ERP from the Lourdes Hospital. Though I'd say Kilkeel reception will be largely unaffected.

What f***ing lunacy is this to put it on that allocation?! It's quite cynical to force this upon unsuspecting people who will wake up to snow on their UK channels without warning. I'll be damned if I see anyone in Drogheda pay money to boxer because of ComReg's arrogance in trying to kill off the overspill.

For the record, the brougher mountain analogue frequencies would work perfectly fine in the area, but not when the Navan relay is to get the allocation I believe. I don't see what's wrong with using Ch 30 32 34 37 as an allocation instead of the Divis ones though?!

It's probably goodbye to Brougher Mtn reception in the Mayo/Roscommon area thanks to Castlebar too.

Last edited by lucernarian; 04-08-2008 at 05:07.
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04-08-2008, 08:06   #4
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I think that most people after UK ASO are going to realise that if they want free UK tv then its got to be Freesat. "Free" tv in Ireland post 2012 will mean a MPEG-4 DTT box for Irish tv and an UK Freesat box, otherwise its cable, $ky, or Boxer. There are not going to be a huge amount of people with useable UK freeview signals.
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04-08-2008, 11:26   #5
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Quote:
Dungarvan 55 59 62 65
Clonmel 55 59 62 65
Looks strange to me that they would give Dungarvan and Clonmel the same frequencies.
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04-08-2008, 11:37   #6
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Thought that too as it is only a 20 minute drive between both.
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04-08-2008, 12:05   #7
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Quote:
Originally Posted by Mossy Monk View Post
Thought that too as it is only a 20 minute drive between both.
Different direction,different polarity and low power and there should not be a problem.

I notice Arfon in Wales have had a major refurbishment on it's UHF aerial stack.
I was getting worried here as the reception was shoite since last january.
Within the last 6 weeks or so it's gone like a mirror again which augers well for anyone that wants to use it for UK freeview anywhere from Greystones south to around Gorey/Courtown.
It won't have the commercial channels,just the pbs muxes but it will give all the BBC's,CH4,CH5,E4 etc.
Anyone with existing good arfon should be fine as it's not using kippure or Mt Leinsters channels.
It's going to be only about 2k erp but considering presely can make it over most of the time on half that...it should be good.
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05-08-2008, 13:59   #8
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As I've mentioned before, the increase in power for Preseli and the use of a number of the same frequencies can only cause problems (regardless of mpeg2/4 transmission) across the sea.

There are reports of people being able to pick up the Irish test along the Pembrokeshire coast, where they are unable to pick up Preseli. It is clearly being done to avoid spill over, which is a bit pathetic if it could cause loss of signal due to interference.

Interestingly Boxer (in their application document) have highlighted the need for a Wexford town relay (presumably Forth Mountain) but the maps show no coverage improvement when the signal is switched on!

What channel is RTE currently using for DTT from Mt. Leinster?
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05-08-2008, 18:42   #9
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Surely Kippure and 3 Rock can't be on exactly the same frequencies, can they? I can receive both perfectly from Terenure with an extremely cheap B&Q aerial and I'm sure it's the same for most of Dublin. Would this not cause massive co-channel interference?
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05-08-2008, 19:18   #10
lucernarian
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Quote:
Originally Posted by marclt View Post
As I've mentioned before, the increase in power for Preseli and the use of a number of the same frequencies can only cause problems (regardless of mpeg2/4 transmission) across the sea.

There are reports of people being able to pick up the Irish test along the Pembrokeshire coast, where they are unable to pick up Preseli. It is clearly being done to avoid spill over, which is a bit pathetic if it could cause loss of signal due to interference.

Interestingly Boxer (in their application document) have highlighted the need for a Wexford town relay (presumably Forth Mountain) but the maps show no coverage improvement when the signal is switched on!

What channel is RTE currently using for DTT from Mt. Leinster?
Which document did you find Boxer mentioning the need for a relay in Wexford? A link would be brilliant if you have it.
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06-08-2008, 00:41   #11
marclt
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Originally Posted by To_be_confirmed View Post
Which document did you find Boxer mentioning the need for a relay in Wexford? A link would be brilliant if you have it.
Hi to be confirmed

here it is... http://www.bci.ie/DTT/boxer/licencea_section8_print.pdf the document is on the BCI website... boxer have a number of plans for fill in relays to compliment the higher power sites.... looks quite ambitious... who knows if it will ever happen!!!

marc

Last edited by marclt; 06-08-2008 at 00:43.
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06-08-2008, 10:45   #12
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Quote:
Originally Posted by In the old days View Post
Surely Kippure and 3 Rock can't be on exactly the same frequencies, can they? I can receive both perfectly from Terenure with an extremely cheap B&Q aerial and I'm sure it's the same for most of Dublin. Would this not cause massive co-channel interference?
Could be running in an SFN?
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06-08-2008, 11:03   #13
thomasking22008
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i find this bci seem interesting about dtt
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06-08-2008, 11:48   #14
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Or sectorised. Three rock has no coverage to west & South West.

Kippure could have more than 180 degrees and still not illuminate Three Rock areas. at least half of Kippure's coverage can't be seen by Three Rock at all as hills in the way..


You just need a Kippure aerial with North to East missing...

That would be Chimney/outdoor aerial coverage, or set-top aerial with window view of Three Rock

Last edited by watty; 06-08-2008 at 11:51.
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04-10-2008, 19:44   #15
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Watty,

Do you have a similar map for Clermont Carn?

Thanks
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