Full Freeview on the Divis (Northern Ireland) transmitter
 | Google Streetview |  | Google map |  | Bing map |  | Google Earth |  | 54.607,-6.009 or 54°36'24"N 6°0'34"W |  | BT17 0NG |
The symbol shows the location of the Divis (Northern Ireland) transmitter which serves 440,000 homes. The bright green areas shown where the signal from this transmitter is strong, dark green areas are poorer signals. Those parts shown in yellow may have interference on the same frequency from other masts.
Are there any planned engineering works or unexpected transmitter faults on the Divis (Northern Ireland) mast?
Divis transmitter - Divis transmitter: Possible effect on TV reception week commencing 11/11/2024 Pixelation or flickering on some or all channels 
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Digital television services are broadcast on a multiplexes (or Mux) where many stations occupy a single broadcast frequency, as shown below.
64QAM 8K 3/4 27.1Mb/s DVB-T MPEG2
DTG-12 QSPK 8K 3/4 8.0Mb/s DVB-T MPEG2
H/V: aerial position (horizontal or vertical)
Which Freeview channels does the Divis transmitter broadcast?
If you have any kind of Freeview fault, follow this Freeview reset procedure first.Digital television services are broadcast on a multiplexes (or Mux) where many stations occupy a single broadcast frequency, as shown below.
64QAM 8K 3/4 27.1Mb/s DVB-T MPEG2
DTG-12 QSPK 8K 3/4 8.0Mb/s DVB-T MPEG2
H/V: aerial position (horizontal or vertical)
Which BBC and ITV regional news can I watch from the Divis transmitter?
BBC Newsline 0.6m homes 2.5%
from Belfast BT2 8HQ, 1,044km northeast (51°)
to BBC Northern Ireland region - 46 masts.
Are there any self-help relays?
| Chapel Fields | Transposer | Central Belfast | 61 homes |
How will the Divis (Northern Ireland) transmission frequencies change over time?
| 1950s-80s | 1984-97 | 1997-98 | 1998-2012 | 2012-13 | 4 Mar 2020 | ||||
| VHF | A K T | A K T | A K T | K T | W T | ||||
| C1 | BBCtvwaves | ||||||||
| C21 | C4waves | C4waves | C4waves | +D3+4 | D3+4 | ||||
| C23 | SDN | SDN | |||||||
| C24 | ITVwaves | ITVwaves | ITVwaves | BBCB | BBCB | ||||
| C26 | ArqA | ArqA | |||||||
| C27 | BBC2waves | BBC2waves | BBC2waves | BBCA | BBCA | ||||
| C29 | ArqB | ||||||||
| C30 | LBT | ||||||||
| C31 | BBC1waves | BBC1waves | BBC1waves | ||||||
| C33 | com7 | ||||||||
| C34 | com8 | ||||||||
| C36 | _local | ||||||||
| C48 | NIMM | NIMM | |||||||
| C55tv_off | com7tv_off | ||||||||
| C56tv_off | COM8tv_off |
tv_off Being removed from Freeview (for 5G use) after November 2020 / June 2022 - more
Table shows multiplexes names see this article;
green background for transmission frequencies
Notes: + and - denote 166kHz offset; aerial group are shown as A B C/D E K W T
waves denotes analogue; digital switchover was 10 Oct 12 and 24 Oct 12.
How do the old analogue and currrent digital signal levels compare?
| Analogue 1-4 | 500kW | |
| BBCA, D3+4, BBCB | (-7dB) 100kW | |
| SDN, ARQA, ARQB | (-10dB) 50kW | |
| com8 | (-16dB) 12.7kW | |
| com7 | (-16.1dB) 12.4kW | |
| LBT | (-20dB) 5kW | |
| Mux 1*, Mux 2*, Mux A*, Mux B* | (-23.4dB) 2.3kW | |
| Mux C* | (-24dB) 2kW | |
| Mux D* | (-24.9dB) 1.6kW | |
| NIMM | (-47dB) 10W |
Which companies have run the Channel 3 services in the Divis transmitter area
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Sunday, 11 November 2012
K
KMJ,Derby7:20 PM
MEM: Try entering 12C manually then move the radio around until a signal is showing then select store. You are not too far away from Clermont Carn, but it does depend on what hills are blocking the signal path. As you say, a more powerful transmitter would help too but DAB generally is somewhat underpowered if it is to match reception on FM. Are you able to receive the FM services from Clermont Carn OK?
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Monday, 12 November 2012
F
Felix valentine7:02 PM
Downpatrick
Hi can I receive rte with my aerial in the loft and pointing towards divis
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Felix's: mapF's Freeview map terrainF's terrain plot wavesF's frequency data F's Freeview Detailed Coverage
Felix valentine: Probably. You will need a Freeview HD reciever; RT/TG4 are in standard definition. They are broadcast from Black Mountain rather than Divis but it is only four degrees anti-clockwise from Divis, so, assuming no issues such as an obstruction, then the single aerial should be expected to work for both.
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Tuesday, 13 November 2012
W
William Hawe6:31 PM
Belfast
Since the most recent NI switchover I have been experiencing problems with the digital teletext service (picture is fine). All BBC channels have an intermittent text service, i.e. page returns to TV picture or 'Technical difficulties..' message displayed. The Channel 4 text service is not intermittent but the page content has not been updated since 27th October. My aerial is situated on an external wall & our local transmitter is Divis. Can anyone confirm that the digital teletext service is functioning correctly from the Divis transmitter, alternatively any assistance in resolving the matter would be much appreciated, thanks in advance.
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William's: mapW's Freeview map terrainW's terrain plot wavesW's frequency data W's Freeview Detailed Coverage
Wednesday, 14 November 2012
G
gerry flanagan8:23 PM
wats the best[ freeview ] transmitter to go for in virginia in cavan
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gerry flanagan: Any you can get!
Basically it will be down to Divis or Brougher Mountain. Both use only Group A channels. Brougher's COMs are on very low power and co-channel with Divis' PSBs, so they are not at all likely.
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G
gerry flanagan8:44 PM
hi my name is[ gerry flanagan ]from dublin iam A tv satellite rigger instaler one of them guys that used to pot up 100 feet mast tv aerials just to get bbc. i have job to du in hotel in virginia co cavan wat transmitter will i goe for [freeview]also just dun job on the north road the ward finglas nth co dublin app 7 miles from dublin city and got all freeview channels from divis groop A uased high gain triax wide band 32W MAST HEAD AMP .I WAS IN SHOCH NEVER TAUGHT FREEVIEW WOOD GET DOWN SO NEAR DYBLIN HAPPYDAYS
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gerry flanagan: Wideband aerials have less gain on Group A channels. See:
Rowridge Transmitter
For that reason, there is no such thing as a High Gain wideband aerial for the A group frequencies, of which Divis uses exclusively. For that reason, the better bet, where a high-gain aerial is required, is to use a Group A high-gain aerial.
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Monday, 19 November 2012
F
Frank5:38 PM
Bangor
Hi, just bought i-can easy Freeview HD set top box and receiving 80 channels includng HD channels here in Bangor. However unable to receive RTE channels. Freeview UK website states that reception is varaiable for my postcode and house number. My neigbours across the cul-de sac tho are given a green for reception. Do I need to upgrade my aerial?
Regards
Frank
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Frank's: mapF's Freeview map terrainF's terrain plot wavesF's frequency data F's Freeview Detailed Coverage
Frank: I'm not familiar with the i-Can, but if it allows manual tuning, then tune to UHF channel 39. If there is a setting on the manual tune screen for DVB-T or DVB-T2, then ensure that the latter is selected.
It is a good idea to confirm that the receiver you have will receive RT channels so as not to have work done on your aerial if it isn't that that's at fault.
On the subject of aerials and the NI Mux (RT/TG4), there are two things to be aware of:
1. Like the former Channel 5 analogue signal, the NI Mux is broadcast from Black Mountain rather than Divis. For many people the two are on close enough bearings such that a single aerial will work for both. At your location Black Mountain is 5 degrees anti-clockwise of Divis.
2. The NI Mux is on C39 which is officially just outside of Group A. It is close enough that some aerial will work.
See this page which illustrates the point:
Gain (curves), Again
Along the bottom are UHF channel numbers (frequencies) and the Divis ones are from 21 to 29. The traces are just examples and may not be the same as that of your aerial.
However, the gain outside-of-group (C39 is outside of Group A) for contract aerials can be very inconsistent.
Group K goes further up than Group A, so if you have your aerial replaced, that might be the thing to go for. A wideband yagi aerial isn't really suited to Group A transmitters because the gain is lower on Group A channels.
If possible, I suggest that you see if you can get your receiver tuned to the NI Mux, perhaps by connecting it to your neighbour's aerial.
If it doesn't receive RT when you connect it to your aerial, then try turning it slightly anti-clockwise, observing the signal strength screen whilst on the tuned RT channel or whilst on manual tuning screen with C39 selected (and DVB-T2 mode selected if applicable). When you do this, if you don't press the button to scan/search the channel it will hopefully (as many do) give an indication of signal strength, which means that you can use it as a signal meter.
For information on aerials, see ATV's site:
ATV`s Choice Of Aerials for digital TV
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