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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Friday, 29 March 2013
P
P. Kieran Ward11:53 PM
Has anyone heard what is causing the problem with the Divis Transmitter?
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Saturday, 30 March 2013
Sunday, 31 March 2013
P
P. Kieran Ward12:32 AM
Michael
If you read the previous posts re: Transmitter engineering on Divis. It would appear that it is now effecting radio transmissions while earlier it was some TV. I was just wondering if it was due to additional engineering for changes later this year - i.e. Northern Visions etc.
Regards
Kieran
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Tuesday, 2 April 2013
P
Peter Henderson2:25 AM
The DAB problem could be due to the fact that Digital One will be broadcasting from Divis in a few months time.
I think FM transmissions are still from the old mast.
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Tuesday, 30 April 2013
G
Gary11:24 PM
Donaghadee
Whats happening, lost signal to film4, did a suggested re-tune, now instead of 144 channels i have only 66.
is there transmitter maintenance going on, this has been playing for the past week or so? has this something to do with 4G masts problem from 2013 - 2017, thats along time to have to put up with poor signals.
roof top vertical mast.
oh further a further re-tune have given me 103 channels, oh another re-tune has given me 144 channels again.
i thought the digital switchover was to sort out these old issues.
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Gary's: mapG's Freeview map terrainG's terrain plot wavesG's frequency data G's Freeview Detailed Coverage
Thursday, 2 May 2013
W
wayne cochrane11:05 AM
Donaghadee seems to be in a good reception area for the Divis main transmitter, but could be prone to interference from Caldbeck in NW England.
I don't think they've done any 800 MHz 4G tests in NI yet.
Might be no harm to get your aerial system checked out.
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Monday, 17 June 2013
Hi Brian,
I see that there has been some transmitter engineering on the Divis transmitter on the 12th of June.
Some of my equipment recorded a momentary loss of signal on one of the multiplexes (COM6), at approximately 11:00 AM on the 12th June.
Would it be possible that the transmission was interrupted due to the engineering works ?
Thanks,
Arun
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Arun's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
Arun: It's possible. The BBC "R+T Investigation" system doesn't report the COM multiplexes, so you have to (as they told me) "infer" what is happening to them.
It looks like the event was a mains power failure, to which systems probably have a certain amount of backup.
So... basically "yes".
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Thanks Brian, for the information.
Explains why it was just a momentary loss, and not a loss for an extended time or a low signal condition.
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Arun's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
Wednesday, 17 July 2013
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