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.

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

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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

Peter Henderson

_{sentiment_satisfied}Silver

3:47 PM

Just to clarify things re. RTE, a standrd definition Freview set top box/TV will tune in all (apart from RTE Two HD) and the NI mux. However, you will get sound only and no . Thi is obviously not a problem with regard to the.

HD channels (Whether RTE or BBC) simply don't appear on a definition STB or TV when you do a rescan.

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Peter Henderson's 240 posts GB flag

Briantist

_{sentiment_very_satisfied}Owner

4:06 PM

Peter Henderson: that's not correct. UK SD equipment cannot receive the minimux for lack of dvb-t2 and can't get the roi direct for lack of MPEG 4 decoding.

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Briantist's 38,915 posts GB flag

Briantist

_{sentiment_very_satisfied}Owner

4:08 PM

See Northern Ireland RTE1, RTE2, TG4 special mini-multiplex from 24 October | ukfree.tv - 10 years of independent, free digital TV advice please.

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Briantist's 38,915 posts GB flag

P

Peter Henderson

_{sentiment_satisfied}Silver

5:18 PM

Brian: I assume SD equioment will receive the NI mux in the same way as it receives i.e. sound but no .

SD equipment will definitely tune in Saorview this way. I know this from experience. I assume the NI mux will be no different ?

SD equipment will not recognise HD transmissions at all e.g. RTE Two HD and the , so nothing will be placed on the E.P.G. in this case

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Peter Henderson's 240 posts GB flag

M

Michael

_{sentiment_satisfied}Gold

5:34 PM

Peter Henderson: No, a DVB-T tuner won't pick up the DVB-T2 NI mux (just like a 2k tuner won't pick up the new 8k ).

I have seen a manual box with DVB-T/MPEG2 for and MPEG4 for audio so you may well be correct.

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Michael's 358 posts GB flag

M

Michael

_{sentiment_satisfied}Gold

5:35 PM

* box manual

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Michael's 358 posts GB flag

M

mrdtv

_{sentiment_satisfied}Gold

6:44 PM

Peter Henderson:

To receive

a)

b) NIMM

c)

d) Freeview SD

simultaneously if you have access to all of these formats, the ONLY choice is Freeview HD equipment. As recommended by DUK.

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mrdtv's 321 posts GB flag

P

Peter Henderson

_{sentiment_satisfied}Silver

12:09 AM

Well, we'll see next wednesday re. the NI mux

However, I'm 100% certain an SD will receive a from but with sound only.

An SD receiver will not decode an HD signal, in much the same way as a 2K receiver wont decode an 8K signal.

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Peter Henderson's 240 posts GB flag

Briantist

_{sentiment_very_satisfied}Owner

10:56 AM

Peter Henderson: I think you are getting a few things mixed up.

MPEG4 is used on all RoI , not just those in high definition. As MPEG4 provides the same "" in about half the bandwidth, this makes sense.

The 2k/8k comparison is not the same, as this is a "lower" level.

A DVB-T2 will see the bitstream from DVB-T and not vice versa.

This has nothing at all to do with MPEG2/MPEG4 decoding.

There are some set-top boxes in the UK, those provided by BT Vision, which CAN decode MPEG4.

Saorview boxes, on the other hand, can decode MPEG2 and MPEG4, but can't see the DVB-T2 transmissions.

Also, most MPEG4 receivers can "decode" pictures in higher defintions, and resample them down to SD.

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Briantist's 38,915 posts GB flag

Dave Lindsay

_{sentiment_very_satisfied}Platinum

11:43 AM

: Does this mean that, theoretically, if the UK was to change from MPEG2 to MPEG4, then there would be room for more (due to using less bandwidth)?

The Republic of has a single which carries definition services and RT Two HD so it is possible to mix them. Does use DVB-T or DVB-T2?

Is the advantage of DVB-T2 that it offers greater bitrate than DVB-T?

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Dave Lindsay's 5,724 posts GB flag

Page 23

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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