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?

J

john boyd
10:19 PM

What strength of attenuator would i need,Carl says a 20db attenuator will probably solve it ?

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john boyd's 6 posts GB flag

Dave Lindsay

_{sentiment_very_satisfied}Platinum

10:27 PM

john boyd: Variable ones are available, such as (other models and suppliers are available, this is one example):

TV Aerial Attenuator Variable 0-20Db Freeview Digital | eBay

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Dave Lindsay's 5,724 posts GB flag

C

Carl

_{sentiment_satisfied}Bronze

10:34 PM
Belfast

John

An attenuator will only solve a problem if the is overloading your TV or box tuner.

You will not need to turn the signal down on RTE from the South.

Your issue appears to be that your equipment is unable to decode the . Given that you were getting good signals from the South it sounds like you require a box with the FREEVIEW HD logo to work

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Carl's 51 posts GB flag

Carl's: C's Freeview map C's terrain plot C's frequency data C's Freeview Detailed Coverage

C

Carl

_{sentiment_satisfied}Bronze

10:40 PM
Belfast

John

I should also mention that a box is which means it will decode Freeview, and the RTE from . In otherwords these boxes cover everything.

Hopefully that makes things a bit clearer.

Carl

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Carl's 51 posts GB flag

Carl's: C's Freeview map C's terrain plot C's frequency data C's Freeview Detailed Coverage

C

Carl

_{sentiment_satisfied}Bronze

10:59 PM
Belfast

John

Please disregard the last two posts I confused you with another issue.

The at the moment is very strong now and given your area a 12 or 20db attenuator should be fine or indeed a variable one from 0 - 20db.

Regards Carl

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Carl's 51 posts GB flag

Carl's: C's Freeview map C's terrain plot C's frequency data C's Freeview Detailed Coverage

J

john boyd
11:15 PM

Thanks for your, I should have said i have sd box but will try A variable attenuator, Carl is there a problem with over loading boxes I see that Elaine in and kdm in have the same problem, I live Mallusk.

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john boyd's 6 posts GB flag

C

Carl

_{sentiment_satisfied}Bronze

1:51 AM
Belfast

John

There shouldnt be a problem with one channel effecting the rest.

now transmitting 100,000 Watts and 50,000 Watts there is very little difference in real power.

UHF signals work on line of sight therefore the transmitters are located on the highest locations. They cannnot travel through rock or mountain no matter what the power increase is, so the key question is pre were you and they getting normal signal?

If you were getting a normal working signal from and the problem occurred when the happened then I would say yes attenuate or lower the signal. If the latter then you would need your signal looked at to see if you can receive it.

Without putting a spectrum analyzer on its difficult to say.

Regards Carl

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Carl's 51 posts GB flag

Carl's: C's Freeview map C's terrain plot C's frequency data C's Freeview Detailed Coverage

J

john boyd
12:02 PM

freeveiw was ok pre will try an attenuator,thanks for your

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john boyd's 6 posts GB flag

G

Gerry
2:04 PM

Had RTE but now can't tune digital RTE Can anyone advise

BT 17 9RX

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Gerry's 1 post GB flag

Dave Lindsay

_{sentiment_very_satisfied}Platinum

2:15 PM

Gerry: You may need a to watch which is the Republic's replacement to the RT you received previously. You will use the same aerial as you used before.

If your RT aerial is vertical (elements up/down) and pointing south, then manually tune to UHF 52. You may find that it picks it up, but doesn't show a picture. If this is the case then you need a Freeview HD receiver, or of course a Saorview receiver will do the trick.

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Dave Lindsay's 5,724 posts GB flag

Page 32

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.

If you have no satellite signal, see Sky Digibox says 'No Signal' or 'Technical fault'

If you have other problems, please provide a full (not partial) postcode (or preferably enter it in box at the top right) and indicate where if aerial is on the roof, in the loft or elsewhere.

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