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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Monday, 15 October 2012
P
Peter Henderson3:47 PM
Just to clarify things re. RTE, a standrd definition Freview set top box/TV will tune in all Saorview channels (apart from RTE Two HD) and the NI mux. However, you will get sound only and no picture. Thi is obviously not a problem with regard to the radio stations.
HD channels (Whether RTE or BBC) simply don't appear on a standard definition Freeview STB or TV when you do a rescan.
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Peter Henderson: that's not correct. UK freeview SD equipment cannot receive the minimux for lack of dvb-t2 and can't get the roi direct for lack of MPEG 4 decoding.
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P
Peter Henderson5:18 PM
Brian: I assume SD equioment will receive the NI mux in the same way as it receives Saorview i.e. sound but no picture.
SD equipment will definitely tune in Saorview this way. I know this from experience. I assume the NI mux will be no different ?
SD equipment will not recognise HD transmissions at all e.g. RTE Two HD and the Freeview HD multiplex, so nothing will be placed on the E.P.G. in this case
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M
Michael5:34 PM
Peter Henderson: No, a DVB-T tuner won't pick up the DVB-T2 NI mux (just like a 2k tuner won't pick up the new 8k signal).
I have seen a Freeview manual box with DVB-T/MPEG2 for picture and MPEG4 for audio so you may well be correct.
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M
mrdtv6:44 PM
Peter Henderson:
To receive
a) Saorview
b) NIMM
c) Freeview HD
d) Freeview SD
simultaneously if you have access to all of these formats, the ONLY choice is Freeview HD equipment. As recommended by DUK.
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Tuesday, 16 October 2012
P
Peter Henderson12:09 AM
Well, we'll see next wednesday re. the NI mux
However, I'm 100% certain an SD receiver will receive a signal from Saorview but with sound only.
An SD receiver will not decode an HD signal, in much the same way as a 2K receiver wont decode an 8K signal.
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Peter Henderson: I think you are getting a few things mixed up.
MPEG4 is used on all RoI Saorview services, not just those in high definition. As MPEG4 provides the same picture "quality" in about half the bandwidth, this makes sense.
The 2k/8k comparison is not the same, as this is a "lower" level.
A DVB-T2 receiver will see the bitstream from DVB-T and not vice versa.
This has nothing at all to do with MPEG2/MPEG4 decoding.
There are some set-top boxes in the UK, those provided by BT Vision, which CAN decode MPEG4.
Saorview boxes, on the other hand, can decode MPEG2 and MPEG4, but can't see the DVB-T2 transmissions.
Also, most MPEG4 receivers can "decode" pictures in higher defintions, and resample them down to SD.
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Briantist: Does this mean that, theoretically, if the UK was to change from MPEG2 to MPEG4, then there would be room for more services (due to using less bandwidth)?
The Republic of Ireland has a single multiplex which carries standard definition services and RT Two HD so it is possible to mix them. Does Saorview use DVB-T or DVB-T2?
Is the advantage of DVB-T2 that it offers greater bitrate than DVB-T?
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