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 22/04/2024 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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Saturday, 27 October 2012
m collins: What you refer to as your "RT aerial" must be pointing to Clermont Carn in the Republic. The system is "Saorview" and some standard definition Freeview receivers won't be able to show a picture (not sure what sort of proportion can and what proportion can't). Evidently yours is one which does not show the Saorview format.
The HD receiver would be expected to be able to. Now I know that you are receiving RT from Clermont Carn, I can tell you that you need to access the manual tune function on your Freeview HD box and tune to UHF/RF channel number 52. If there is a setting for mode (somewhere on the manual tune screen), it should be set to DVB-T rather than DVB-T2.
Check with the DVD recorder what UHF channel it is tuned to for RT. I suspect it will be C52. Do this by going to it and bringing up the signal strength screen. Hopefully it will still show even though it is unable to resolve a picture.
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J
john boyd10:13 PM
thanks dave for taking the time to explain it all
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J
john boyd10:19 PM
What strength of attenuator would i need,Carl says a 20db attenuator will probably solve it ?
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john boyd: Variable ones are available, such as (other models and suppliers are available, this is one example):
TV Aerial Attenuator Variable 0-20Db Freeview Digital | eBay
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C
Carl10:34 PM
Belfast
John
An attenuator will only solve a problem if the signal is overloading your TV or box tuner.
You will not need to turn the signal down on RTE from the South.
Your issue appears to be that your equipment is unable to decode the picture. Given that you were getting good analogue signals from the South it sounds like you require a Freeview HD box with the FREEVIEW HD logo to work
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Carl's: mapC's Freeview map terrainC's terrain plot wavesC's frequency data C's Freeview Detailed Coverage
C
Carl10:40 PM
Belfast
John
I should also mention that a FREEVIEW HD box is DVB T2 which means it will decode Freeview, Saorview and the RTE multiplex from Black Mountain. In otherwords these boxes cover everything.
Hopefully that makes things a bit clearer.
Carl
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Carl's: mapC's Freeview map terrainC's terrain plot wavesC's frequency data C's Freeview Detailed Coverage
C
Carl10:59 PM
Belfast
John
Please disregard the last two posts I confused you with another issue.
The signal at the moment is very strong now and given your area a 12 or 20db attenuator should be fine or indeed a variable one from 0 - 20db.
Regards Carl
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Carl's: mapC's Freeview map terrainC's terrain plot wavesC's frequency data C's Freeview Detailed Coverage
J
john boyd11:15 PM
Thanks for your help, I should have said i have sd box but will try A variable attenuator, Carl is there a problem with c21 over loading freeview boxes I see that Elaine in Lisburn and kdm in Newtownards have the same problem, I live Mallusk.
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Sunday, 28 October 2012
C
Carl1:51 AM
Belfast
John
There shouldnt be a problem with one channel effecting the rest.
Channels now transmitting 100,000 Watts and 50,000 Watts there is very little difference in real signal power.
UHF signals work on line of sight therefore the transmitters are located on the highest locations. They cannnot travel through rock or mountain no matter what the power increase is, so the key question is pre DSO were you and they getting normal signal?
If you were getting a normal working signal from Freeview and the problem occurred when the switchover happened then I would say yes attenuate or lower the signal. If the latter then you would need your signal looked at to see if you can receive it.
Without putting a spectrum analyzer on its difficult to say.
Regards Carl
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Carl's: mapC's Freeview map terrainC's terrain plot wavesC's frequency data C's Freeview Detailed Coverage
J
john boyd12:02 PM
freeveiw was ok pre switchover will try an attenuator,thanks for your help
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