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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.

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 MAX, 209 Ketchup TV, 210 Ketchup Too, 211 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 8 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, 88 Classic Hits, 235 Aljazeera English, plus 19 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, 7 February 2013
W
Wayne Cochran
10:57 AM
Armagh

You can't take it for granted that it's Divis, as Brougher Mountain can prove better in some areas of Monaghan.

link to this comment
Wayne Cochran's 8 posts IE
L
Lynn Steenson
6:46 PM
Armagh

flipdee: yes all the sockets are working fine.

Wayne Cochran: Before the DSO our aerial was set up by an engineer to point at divis.
The checks I did initially showed we were getting signal from Divis. But on your suggestion I checked again and now on investigation I think we are getting Brougher Mountain as we are picking up PSB1 on UHF 28 and PSB2 on UHF 22. Could the recenet inclement weather be the reason for this?
Also we can pick up our Irish channels from Cairn Hill UHF 47 or Clermont Carn UHF 52 with equal quality. Can get the Monaghan transmitter on UHF 55 but quality is poorer!



link to this comment
Lynn Steenson's 15 posts IE
W
Wayne Cochran
11:53 PM
Armagh

You've probably looked at this, but is the aerial pointing northeast for Divis? Brougher would be northwest.

Pre-DSO, Brougher used mostly the same frequencies as Divis, except for 1 mux. It's possible you could have aligned your aerial on either transmitter then & got all available services, even with slight mutual interference.

What exactly is happening now will depend on where your aerial is actually pointed. I would think there'll be a relatively straightforward explanation.

link to this comment
Wayne Cochran's 8 posts IE
Friday, 8 February 2013
L
Lynn Steenson
12:20 AM
Armagh

Wayne Cochran: I have an engineer calling out, to hopefully sort it out. Once its sorted I'll post the findings here!
Thanks for your input :)

link to this comment
Lynn Steenson's 15 posts IE
Dave Lindsay
sentiment_very_satisfiedPlatinum

12:22 AM

Lynn Steenson: If it is the case that your aerial is directed to Brougher Mountain, then you will need to investigate the possibility of using Divis instead.

Brougher's COMs are 2kW whereas its PSBs are 20kW. The reason being that its COMs are co-channel with Divis' PSBs and therefore it's done to protect against interference to Divis PSB viewers.

link to this comment
Dave Lindsay's 5,724 posts GB
Sunday, 17 February 2013
Dave Lindsay
sentiment_very_satisfiedPlatinum

11:38 AM

Lynn Steenson: How did you get on?

link to this comment
Dave Lindsay's 5,724 posts GB
Tuesday, 19 February 2013
L
Lynn Steenson
2:00 PM

Dave Lindsay: I got the azimuth for divis and moved the aerial ourselves. We are now getting two of the coms - com 5 and 6, but cant get com4! The quality is not great on coms, it comes and goes! I'm still waiting on the engineer to come out and hopefully his professional equipment will find the optimal positioning!

link to this comment
Lynn Steenson's 15 posts IE
Dave Lindsay
sentiment_very_satisfiedPlatinum

2:21 PM

Lynn Steenson: COM4 is on C23 which is co-channel with Mount Leinster, which is a powerful transmitter.

link to this comment
Dave Lindsay's 5,724 posts GB
Wednesday, 27 February 2013
P
P. Kieran Ward
sentiment_satisfiedBronze

1:05 AM
Belfast

Hi all!

A change of topic!

I have noticed that the sound volume on BBC One NI (HD on BBCB)is much lower than BBC One NI (SD on BBCA). Is there a reason why this might be?

Regards

Kieran

link to this comment
P. Kieran Ward's 89 posts GB
Briantist
sentiment_very_satisfiedOwner

8:19 AM

P. Kieran Ward: On a properly implemented receiver the levels should be the same. But many receivers do not follow the spec and the HD channel will be at least 7dB quieter.

link to this comment
Briantist's 38,844 posts GB
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