Full Freeview on the Divis (Northern Ireland) transmitter
Brian Butterworth first published this on - UK Free TV
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.
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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, 17 June 2011
P
Peter Henderson10:40 PM
Craig: Currently, a wideband aerial horizontally polarized is needed. After DSO a group A aerial horizontally polarized is needed.
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Saturday, 2 July 2011
M
Mark7:54 PM
Ballymena
I'm a bit confused about the dates listed here for the Divis transmitter digital switchover. All other sources claim that DSO will be completed in the UK before the end of 2012 yet this page claims Divis won't switch until March 2013. Which is correct?
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Mark's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
Sunday, 17 July 2011
Mark: NI was listed in the plan I was shown for "first quarter 2013", due to co-ordination issues with the ROI. As soon as official dates are announced I will change them, but as a general rule I have not had to move dates...
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Monday, 18 July 2011
P
Peter Henderson1:53 PM
Newtownabbey
Brian: I've been told unofficially it's now the end of Nov. 2012 for Divis, but don't take that as gospel
Digital UK did have a date of March 31 2013, if I remember correctly but this has been changed and simply states 2012.
Apparently a DSO manager for the province will be appointed in September to oversee the process so things may become clearer then.
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Peter's: mapP's Freeview map terrainP's terrain plot wavesP's frequency data P's Freeview Detailed Coverage
Peter Henderson: Perhaps they will actually decide at some point. I'm going to leave the date as it is until someone shows me something official.
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Tuesday, 19 July 2011
M
Mark2:58 AM
Ballymena
Thanks guys
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Mark's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
P
Peter Henderson2:56 PM
Newtownabbey
No problem Mark.
The mini RTE mux is also a topic of confusion.
Initially, press reports stated it would be broadcast from Divis, Brougher, Black Mountain (presumably the low power relay for West Belfast) and Carnmoney Hill.
I have been told unoficially the service will be using the old mast which is to be retained for this and existing FM Radio.
However, the latest information on Digital UK's website omits Divis and only states that the mini RTE mux will be broadcast from Black Mountain, Brougher, and Carnmoney Hill.
So what do they mean by Black Mountain ? Is it the low power relay for west Belfast (5 watts post DSO) or will it be a higher power transmitter covering greater Belfast and the surrounding area ?
Confusion all round it would seem.
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Peter's: mapP's Freeview map terrainP's terrain plot wavesP's frequency data P's Freeview Detailed Coverage
Friday, 22 July 2011
P
Peter Henderson1:55 PM
Newtownabbey
Experiencing problems with Divis today.Lots of break up etc.
Signal strength is much the same.
Not sure if any engineering work is taking place or not.
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Peter's: mapP's Freeview map terrainP's terrain plot wavesP's frequency data P's Freeview Detailed Coverage
Peter Henderson: There is no engineering work, see BBC - Reception problems .
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Thursday, 4 August 2011
P
Peter Henderson6:58 PM
Newtownabbey
Brian : A spokesperson for UTV (one of the directors) has just stated on UTV Live that DSO in the province will start in the middle of next year (June ?) and be completed by the end of 2012.
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Peter's: mapP's Freeview map terrainP's terrain plot wavesP's frequency data P's Freeview Detailed Coverage
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