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Full Freeview on the Divis (Northern Ireland) transmitter

first published this on - UK Free TV
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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 25/09/2023 Pixelation or flickering on some or all channels Digital tick

Choose from three options: ■ List by multiplex ■ List by channel number ■ List by channel name

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.

 H max
C27 (522.0MHz)551mDTG-100,000W
Channel icons
1 BBC One (SD) Northern Ireland, 2 BBC Two Northern Ireland, 9 BBC Four, 23 BBC Three, 201 CBBC, 202 CBeebies, 231 BBC News, 232 BBC Parliament, 250 BBC Red Button, plus 13 others

 H max
C21+ (474.2MHz)551mDTG-100,000W
Channel icons
3 UTV (SD) (UTV), 4 Channel 4 (SD) NI ads, 5 Channel 5, 6 ITV 2, 10 ITV3, 13 E4, 14 Film4, 15 Channel 4 +1 NI ads, 18 More4, 26 ITV4, 28 ITVBe, 30 E4 +1, 35 UTV +1 (UTV),

 H max
C24 (498.0MHz)551mDTG-100,000W
Channel icons
46 5SELECT, 101 BBC One HD Northern Ireland, 102 BBC Two HD Northern Ireland, 103 UTV HD (UTV), 104 Channel 4 HD NI ads, 105 Channel 5 HD, 106 BBC Four HD, 109 BBC Three HD, 204 CBBC HD, 205 CBeebies HD, plus 1 others

 H -3dB
C23 (490.0MHz)551mDTG-850,000W
Channel icons
20 Drama, 21 5USA, 29 ITV2 +1, 32 5STAR, 33 5Action, 38 Channel 5 +1, 41 Legend, 42 Great! Movies Action, 57 Dave ja vu, 58 ITVBe +1, 59 ITV3 +1, 64 Blaze, 67 CBS Reality, 69 HorrorXtra, 78 TCC, 81 Blaze +1, 89 ITV4 +1, 91 WildEarth, 203 CITV, 208 Pop Player, 209 Ketchup TV, 210 Ketchup Too, 211 YAAAS!, plus 16 others

 H -3dB
C26 (514.0MHz)528mDTG-850,000W
Channel icons
 Smithsonian Channel, 11 Sky Arts, 17 Really, 19 Dave, 31 E4 Extra, 36 pick, 40 Quest Red, 43 Food Network, 47 Film4 +1, 48 Challenge, 49 4seven, 60 Drama +1, 70 Quest +1, 71 That's 60s, 74 Yesterday +1, 75 That's 70s, 233 Sky News, plus 9 others

 H -3dB
C30 (546.0MHz)528mDTG-850,000W
Channel icons
 Quest Red +1,  Classic Hits, 12 Quest, 25 W, 27 Yesterday, 34 GREAT! movies, 39 DMAX, 44 HGTV, 52 GREAT! romance, 73 HobbyMaker, 76 That's 80s, 82 Talking Pictures TV, 83 Together TV, 84 PBS America, 90 Together TV +1, 235 Al Jazeera Eng, plus 19 others

 H -13dB
C36 (594.0MHz)528mDTG-125,000W
Channel icons
from 29th September 2014: 7 NvTv,

 H -40dB
C48 (690.0MHz)551mDTG-10W
Channel icons
from 4th September 2019: 53 TG4, 54 RTÉ One, 55 RTÉ Two,

DTG-8 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?

regional news image
BBC Newsline 0.6m homes 2.5%
from Belfast BT2 8HQ, 1,044km northeast (51°)
to BBC Northern Ireland region - 46 masts.
regional news image
UTV Live 0.6m homes 2.5%
from Belfast BT7 1EB, 1,044km northeast (51°)
to UTV region - 46 masts.

Are there any self-help relays?

Chapel FieldsTransposerCentral Belfast61 homes

How will the Divis (Northern Ireland) transmission frequencies change over time?

1950s-80s1984-971997-981998-20122012-134 Mar 2020

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

Oct 1959-May 2006Ulster Television
May 2006-Dec 2014UTV plc
Feb 1983-Dec 1992TV-am•
Jan 1993-Sep 2010GMTV•
Sep 2010-Dec 2014ITV Daybreak•
• Breakfast ◊ Weekends ♦ Friday night and weekends † Weekdays only. Divis was not an original Channel 3 VHF 405-line mast: the historical information shown is the details of the company responsible for the transmitter when it began transmitting Channel 3.

Thursday, 25 October 2012
Dave McGeown
11:14 AM


I live in Newtownabbey and my Freeview HD TV is picking up BBC HD, BBC One HD and UTV HD. I haven't seen any of the RTs just yet but I'll do a bit more checking some other time.

I had to retune some elderly relatives' TVs and set top boxes last night. One set was in Larne, which we got 21 TV channels and 14 radio. This was on 2 TVs. From the looks of the EPG, it looks like PSB1 and PSB2 channels mainly. The other relatives in Ballyclare however were getting a full 120+ channels it would appear.

I also checked with my brother if he rescanned my dad's TVs, who lives just south of the Border in Louth. He said that he also has 21 channels.

Why would this occur? Incorrect aerials and/or wrong direction?

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Dave McGeown's 2 posts GB flag
Fergus Maunsell
11:41 AM

Looking at amazon for Freeview HD Box as my TV is a Samsung UE22D5003 22 Inch Full HD 1080p Edge-lit LED TV Electronics & Photo (BT96TZ)

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Fergus Maunsell's 6 posts GB flag
Dave Lindsay

12:01 PM

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 | - 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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Dave Lindsay's 5,724 posts GB flag
john boyd
12:01 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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john boyd's 6 posts GB flag
Dave Lindsay

12:35 PM

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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Dave Lindsay

12:50 PM

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 Lindsay's 5,724 posts GB flag
Dave McGeown
2:42 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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Dave McGeown's 2 posts GB flag
john boyd
3:10 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's 6 posts GB flag
Dave Lindsay

3:54 PM

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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