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Full Freeview on the Divis (Northern Ireland) transmitter

first published this on - UK Free TV
sa_streetviewGoogle Streetviewsa_gmapsGoogle mapsa_bingBing mapsa_gearthGoogle Earthsa_gps54.607,-6.009 or 54°36'24"N 6°0'34"Wsa_postcodeBT17 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.

This transmitter has no current reported problems

The BBC and Digital UK report there are no faults or engineering work on the Divis (Northern Ireland) transmitter.

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.

MuxH/VFrequencyHeightModeWatts
PSB1
BBCA
 H max
C27 (522.0MHz)551mDTG-3100,000W
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

PSB2
D3+4
 H max
C21+ (474.2MHz)551mDTG-3100,000W
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, 30 E4 +1, 35 UTV +1 (UTV),

PSB3
BBCB
 H max
C24 (498.0MHz)551mDTG-6100,000W
Channel icons
56 5SELECT, 101 BBC One HD Northern Ireland, 102 BBC Two HD (England), 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

COM4
SDN
 H -3dB
C23 (490.0MHz)551mDTG-850,000W
Channel icons
12 Quest, 20 Drama, 21 5USA, 29 ITV2 +1, 32 5STAR, 33 5Action, 41 Legend, 42 GREAT! movies action, 46 Channel 5 +1, 58 ITVBe +1, 59 ITV3 +1, 64 Blaze, 67 CBS Reality, 74 Dave ja vu, 78 TCC, 81 Blaze +1, 89 ITV4 +1, 203 CITV, 208 Pop Player, 211 Ketchup TV, 212 YAAAS!, plus 15 others

COM5
ArqA
 H -3dB
C26 (514.0MHz)528mDTG-850,000W
Channel icons
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, 57 Smithsonian Channel, 60 Drama +1, 70 Quest +1, 75 Yesterday +1, 83 Together TV, 233 Sky News, plus 9 others

COM6
ArqB
 H -3dB
C30 (546.0MHz)528mDTG-850,000W
Channel icons
 FreeSports, 25 W, 27 Yesterday, 34 GREAT! movies, 39 DMAX, 44 HGTV, 71 Quest Red +1, 73 HobbyMaker, 82 Talking Pictures TV, 84 PBS America, 91 Classic Hits, 235 Aljazeera English, plus 18 others

LBT
 H -13dB
C30 (546.0MHz)528mDTG-125,000W
Channel icons
from 29th September 2014: 7 NvTv,

com7
 H -9.1dB
C55 (746.0MHz)551mDTG-612,400W
Channel icons


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

DTG-3 64QAM 8K 2/3 24.1Mb/s DVB-T MPEG2
DTG-6 256QAM 32KE 2/3 40.2Mb/s DVB-T2 MPEG4
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
VHFA K TA K TA K TK TW T
C1BBCtvwaves
C21C4wavesC4wavesC4waves+D3+4D3+4
C23SDNSDN
C24ITVwavesITVwavesITVwavesBBCBBBCB
C26ArqAArqA
C27BBC2wavesBBC2wavesBBC2wavesBBCABBCA
C29ArqB
C30LBT
C31BBC1wavesBBC1wavesBBC1waves
C33com7
C34com8
C36_local
C48NIMMNIMM
C55tv_offcom7tv_off
C56tv_offCOM8tv_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

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.

Comments
Thursday, 25 October 2012
D
Dave McGeown
11:14 AM

Hi,

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?

link to this comment
Dave McGeown's 2 posts GB
F
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

Amazon.co.uk: Electronics & Photo (BT96TZ)

link to this comment
Fergus Maunsell's 6 posts GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

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 | ukfree.tv - 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.

link to this comment
Dave Lindsay's 5,724 posts GB
J
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

link to this comment
john boyd's 6 posts GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

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.

link to this comment
Dave Lindsay's 5,724 posts GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

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.

link to this comment
Dave Lindsay's 5,724 posts GB
D
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.

link to this comment
Dave McGeown's 2 posts GB
J
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

link to this comment
john boyd's 6 posts GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

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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Dave Lindsay's 5,724 posts GB
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