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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Thursday, 25 October 2012
Dave McGeown: Only the main transmitters broadcast the COM channels as they don't wish to broadcast from the smaller relay transmitters. See here for an explanation:
Londonderry transmitter | ukfree.tv - 10 years of independent, free digital TV advice
The power of the COM channels from the main transmitters is lower than that of the PSBs which means that some on the fringes will only be able to receive PSBs only as well.
In some locations it is possible to change from using the relay to using the main station.
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J
john boyd12:01 PM
there seems to be a problem with channel 21 which carries utv c4 c5 etc I did a test the signal is 97% but the quality is only 54 % are you working on it ?,the rest of the channels are ok at 98% signal and 96% quality, my wife is not too please no utv I live in newtownabbey
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Neil Robertson: The only other possibility is to try an amplifier.
Not suggesting for one moment that your aerial building skills aren't up to scratch, but you might want to check out A.T.V (Aerials And Television) TV Aerial, DAB Aerial, FM Aerial. for lots of information and an online shop.
I'm not an aerial professional myself, but I have read on here one of the pros saying that in situations where the receiver is quite a bit of having line-of-sight that a lower gain aerial and amplifier can produce better results. The reason being that the acceptance angle of the antenna is greater than a high gain aerial.
Digital signals require good quality and I suppose that a wider "looking" angle means that if part of it isn't so good but others is better then the overall result may be a better quality signal. Whereas focusing on a narrower beam means that should it be poor then the signal received will be poor.
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Lorri Henry: Do a manual scan of UHF channel 39. You may need to set it to DVB-T2 mode (rather than DVB-T) if there is such a setting in the manual tune part.
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Dave McGeown2:42 PM
Dave Lindsay: Thanks, the link has solved that mystery for me. I guess my dad and those in Larne will have to do with the smaller selection of channels.
Thanks again for your help.
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john boyd3:10 PM
as you can see bad reception on c21 utv etc what are utv and others going to do about this,sorry but is everyone going to have to buy an attenuator, because they cant get it right
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john boyd: The purpose of an attenuator is to reduce the signal level coming down the aerial lead. They may be needed in cases where the aerial is "pulling in" too much signal now the signals are stronger.
The purpose of increasing the power of the signal (at switchover) is to increase the coverage area. This is not the broadcasters "getting it wrong" unless you only measure their success by whether you can receive the signals adequately or not.
Of course, it is not the responsibility of the broadcasters to adjust viewers' aerial systems (including installing attenuators where necessary).
A crude attenuator is to remove the outer part of the aerial plug (if it screws together) or hold the plug in close proximity to the socket. If the quality improves this may give an indication as to whether it could be too high a signal level that is the problem. Wait several seconds before the signal meter on the screen catches up.
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john boyd: Some devices have an in-built "booster" and this should probably be set to off.
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Sinead5:33 PM
I bought my Freeview HD box a number of months ago in anticipation that I would receieve RTE channels in Belfast - BT12 6EG, however I have been very disappointed as I am unable to receive any RTE channels. I have restored factory settings, reinstalled and updated channel lists on my i-Can Easy HD 2851T Freeview HD Set Top Box. I have also noticed that when I rescanned some channels appeared on the search list but did not appear on the TV menu. Any thoughts would be greatly appreciated.
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