Full Freeview on the Divis (Northern Ireland) transmitter

Brian Butterworth first published this on 1st May 2004 at 08:20 - UK Free TV

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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

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

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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.

Mux	H/V	Frequency	Height	Mode	Watts
PSB1 BBCA	H max	C27 (522.0MHz)	551m	DTG-	100,000W
	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, plus 14 others
PSB2 D3+4	H max	C21+ (474.2MHz)	551m	DTG-	100,000W
	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), 71 That’s 60s,
PSB3 BBCB	H max	C24 (498.0MHz)	551m	DTG-	100,000W
	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, 107 BBC Three HD, 204 CBBC HD, 205 CBeebies HD, plus 1 others 66 TBN UK,
COM4 SDN	H -3dB	C23 (490.0MHz)	551m	DTG-8	50,000W
	20 U&Drama, 21 5USA, 29 ITV2 +1, 32 5STAR, 33 5Action, 38 Channel 5 +1, 41 Legend, 42 GREAT! action, 57 U&Dave ja vu, 58 ITV3 +1, 59 ITV4 +1, 64 Blaze, 67 TRUE CRIME, 68 TRUE CRIME XTRA, 81 Blaze +1, 83 Together TV, 91 WildEarth, 93 ITVBe +1, 209 Ketchup TV, 210 Ketchup Too, 211 YAAAS!, 251 Al Jazeera English, 255 FRANCE 24 (in English), 265 Rok Sky +1, plus 29 others
COM5 ArqA	H -3dB	C26 (514.0MHz)	528m	DTG-8	50,000W
	11 Sky Mix, 17 Really, 19 U&Dave, 31 E4 Extra, 36 Sky Arts, 40 Quest Red, 43 Food Network, 47 Film4 +1, 48 Challenge, 49 4seven, 60 U&Drama +1, 65 That's TV 2, 70 Quest +1, 74 &UYesterday +1, 76 That's TV 2 MCR, 233 Sky News, plus 13 others
COM6 ArqB	H -3dB	C30 (546.0MHz)	528m	DTG-8	50,000W
	12 Quest, 25 U&W, 27 U&Yesterday, 34 GREAT! movies, 39 DMAX, 44 HGTV, 52 GREAT! christmas, 56 That's TV (UK), 63 GREAT! romance mix, 73 HobbyMaker, 75 That's 90s, 82 Talking Pictures TV, 84 PBS America, 235 Al Jazeera Eng, plus 18 others
LBT	H -13dB	C36 (594.0MHz)	528m	DTG-12	5,000W
	from 29th September 2014: 7 NvTv,
NIMM	H -40dB	C48 (690.0MHz)	551m	DTG-	10W
	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?

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

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 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	BBCtv_waves
C21		C4_waves	C4_waves	C4_waves	+D3+4	D3+4
C23					SDN	SDN
C24		ITV_waves	ITV_waves	ITV_waves	BBCB	BBCB
C26					ArqA	ArqA
C27		BBC2_waves	BBC2_waves	BBC2_waves	BBCA	BBCA
C29					ArqB
C30						LBT
C31		BBC1_waves	BBC1_waves	BBC1_waves
C33						com7
C34						com8
C36						_local
C48					NIMM	NIMM
C55_{tv_off}						com7_{tv_off}
C56_{tv_off}						COM8_{tv_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

Local transmitter maps

Divis Freeview Divis DAB Divis TV region BBC Northern Ireland UTV

Which companies have run the Channel 3 services in the Divis transmitter area

Oct 1959-May 2006	Ulster Television
May 2006-Dec 2014	UTV plc

Feb 1983-Dec 1992	TV-am•
Jan 1993-Sep 2010	GMTV•
Sep 2010-Dec 2014	ITV 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.

Is the transmitter output the same in all directions?

P

PeterH
1:44 AM

Thanks Carl.

Yes, a duplexer was fitted and I thought this may be the issue. I was thinking of a filter as well.

I did query whether or not two antennas could be diplexed but he assured me this would be fine. Going to give him a ring tomorrow so I'll pass on your suggestion.

I assume if everything is split should come in fine again with the predicted improvement on the LBT mux ?

This has also deteriorated. Was actually receiving it well no break up on a Panasonic PVR, which I think are more sensitive than the Humax boxes.

51 is being received on the Panasonic but on none of my Humax boxes or a BT DTR 4000.

Very disappointed since I spent a fair bit of money getting this sorted and everything was greatb yesterday, but I suppose these things unpredictable.

The day when free to air TV is delivered by high speed broadband and can't come soon enough.

They really should be trying to develop as well and the Channel 4 HD/All 4 situation is deplorable.

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PeterH's 3 posts GB flag

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Chris.SE

_{sentiment_very_satisfied}Platinum

4:09 AM

PeterH:

Apparently you can get C4 HD on - If you know how to you can tune in C4 HD in non- on:

11127, V, 22000, 5/6, DVB-S, QPSK.

according to All of the free TV channels on PGSTART1160 in the UK | free and easy

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Chris.SE's 4,358 posts GB flag

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CARL READE

_{sentiment_satisfied}Bronze

8:32 AM

PeterH: the thing is, is now totally so fitting a diplexer will cut off on the Divis side so pointless. To future proof I would say,
Two wideband aerials, a wideband amp for rte if required then into an inductive splitter/combiner However a WB mast amp will boost everything so an attenuater may be needed on the Divis side.
A 4g filter maybe required as well (mast amp should be filtered).
That's what I have came up with to cover all changes.

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CARL READE's 51 posts GB flag

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GREGG HINTON
10:18 AM

Have lost freesport(64) and forcestv(96) from my sharp and Sony tvs. have retuned several times but they are still missing. can you suggest a solution. i live in lurgan Co ni thank you

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GREGG HINTON's 1 post GB flag

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Chris.SE

_{sentiment_very_satisfied}Platinum

11:39 AM

GREGG HINTON:

Are you getting any of the other on the COM8 ? See - Digital UK | Channel listings

It may be that since the changes with COMs 7&8 at somewhat lower than the others (and due to be reduced further in Q1 2020), that you may no longer be able to receive them.
To check for predicted use the coverage checker Digital UK - Coverage checker if you have a UK postcode.

Note also that they are temporary multiplexes and are due to close sometime before 2022. See Digital UK | 700MHz clearance for general information.

PS. Please don't use all CAPS in your posts, it's regarded as shouting ;)

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Chris.SE's 4,358 posts GB flag

I

Ian.JH
2:02 PM

Chris.SE:

I I'm not speaking out of turn or breaking some site etiquette as I've never posted here before, go easy on me :-)

I have lost some after the Wed 4th Sept. re-tune. It appears I have lost all the channels on com 7 and multiplex com 8. These were previously fine before the re-tune.

I live in NI, and I'm using a BT + box, model:DTR-T2110

Can someone explain to me why this has happened and what I can do about it?

Are com7 and com8 still being broadcast? I read on ukfree.tv that these are due to expire on 21st June 2020. Has this been brought forward?

Have their transmission frequencies and/or been changed? would an solve this?

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Ian.JH's 3 posts GB flag

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CARL READE

_{sentiment_satisfied}Bronze

7:41 PM

Ian.JH: Lilley to be one of two things, if you have rte the diplxer box will cause it. If not your now needs to be . Or could be both.

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CARL READE's 51 posts GB flag

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Chris.SE

_{sentiment_very_satisfied}Platinum

4:01 AM

Ian.JH:

It is correct that you'd need a /Group T aerial as mentioned by Carl Reade, however as I mentioned in my previous post on this page which he may have missed, COMs 7&8 are on much lower .
Unless you happened to be very close to the , an old group A aerial is unlikley to pick up the .

However, check the predicted at your location by putting your postcode into the coverage checker Digital UK - Coverage checker . If there's no predicted reception from , you may consider it a waste changing your aerial. Obviously you need to check you don''t have any diplexers etc that might affect the signal.
COMs 7&8 are due to close by sometime in 2022, it will depend on take up by the Mobile operators and will not necessarily be at the same time for all areas.

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Chris.SE's 4,358 posts GB flag

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CARL READE

_{sentiment_satisfied}Bronze

8:17 AM

Chris.SE: when com 7,8 close are the within going or are they being "remuxed"?

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CARL READE's 51 posts GB flag

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StevensOnln1

_{sentiment_very_satisfied}Platinum

11:13 AM

CARL READE: Nothing has been announced yet as to whether any of the broadcasters will move any of their on COM7/8 to another . If more muxes convert to DVB-T2 there would be space for all of them to move and more coverage, although this would come at an increased cost to the broadcasters, which not all may be willing or able to afford.

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StevensOnln1's 3,670 posts GB flag

Page 62

Please post a question, answer or commentIf you have Freeview reception problems before posting a question your must first do this Freeview reset procedure then see: Freeview reception has changed, Single frequency interference, and Freeview intermittent interference.

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