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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
Friday, 8 November 2013
J
jb38
sentiment_very_satisfiedPlatinum

11:53 PM

PaulN : Although you have now rectified your problem, but purely for info purposes transformers used in boosters etc are all fitted with miniature thermal fuses strapped to the outer windings on the primary side of the transformer and are usually covered by a layer of tape.

All you might notice is a small lump under the outer covering of the primary windings.

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jb38's 7,179 posts GB
Saturday, 9 November 2013
P
PaulN
sentiment_satisfiedBronze

6:51 PM

That's interesting cos is there is a wee layer of tape on there. Everyday a school day ! Cheers

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PaulN's 39 posts GB
MikeP
sentiment_very_satisfiedPlatinum

11:14 PM

PaulN :
It has been pretty much standard practice with small transformers of the type used in such power units to have a small safety cut-out fuse included, mounted so that any excess heat in the windings causes it to fail safe. Such heat would normally be the result of a fault either in the windings themselves or the secondary side components. A correct repair would be to replace the transformer if available and you are competent at such repairs, remembering that you are dealing with mains voltages (230 Volts). Replacing the whole power unit as perhaps a better, safer alternative, but make sure you use the correct unit to maintain safety of all equipment connected.

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MikeP's 3,056 posts GB
Sunday, 10 November 2013
P
PaulN
sentiment_satisfiedBronze

7:19 PM

I found it much easier and cheaper to replace the entire power supply with an external AC/DC converter. The labgear unit has a nice convenient flying lead where I was able to splice on a connector for the external converter. Cost me like 4 quid plus some scraps of wire and connectors I had about the place. Oh and I replaced the labgear power led with a 12V version for convenience. The new converter has a 1A rating while the old transformer was stickered for 400mA at 12V so I have plenty of headroom.

I may yet investigate the old transformer for the thermal fuse but I have a good result with a cheap, safe repair.

link to this comment
PaulN's 39 posts GB
J
jb38
sentiment_very_satisfiedPlatinum

9:33 PM

PaulN: As far as the old transformer is concerned its not really worthwhile replacing the thermal fuse anyway as its not really known for sure what caused it to fail in the first place, as although its not exactly unknown for a T/ fuse to fail as simply "one of those things" and with replacement of same bringing the amp back into life, but though on the other hand the overheating "might" have been due to the transformers primary having developed a partial short across a few of the windings thereby over-volting the remainder and causing excessive current to be drawn, and so if the fuse had simply been replaced you might possibly have found that the problem re-occurred after an hour or so when the transformer reached the point where the heat once again resulted in the fuse to failing.

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jb38's 7,179 posts GB
Wednesday, 13 November 2013
P
Pauric
11:54 PM

Hi
I was just wondering since digital switchover I was able to receive all the digital channels but than I lost CH 23 and a few weeks ago I lost CH26 I get my freeview signal from Divis and saorview from Clermont carn. Is it interference and what can I do to get them back, I live in south Co Monaghan

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Pauric's 4 posts IE
Thursday, 14 November 2013
P
P. Kieran Ward
sentiment_satisfiedBronze

11:38 PM
Belfast

Hi Pauric!

You have indicated that you have lost both Channel 23 and Channel26 a few weeks ago. Have you manually rescanned both these channels? I know that was recent work being undertaken at the Divis Transmitter but no major changes have taken place at that time. The stations that you are looking for in a rescan are as follows:

COM4/SDN on Channel 23
10 ITV 3,
20 Drama,
25 Dave ja vu,
27 ITV 2 +1,
30 5*,
31 5USA,
38 Quest,
39 The Zone,
44 Channel 5 +1,
55 5 Later,
61 True Entertainment,
63 ITV 3 +1,
72 CITV,
16 QVC,
23 Bid,
49 The Jewellery Channel.
There is also a number of Adult, Digital Radio and Text channels transmitted on this UHF channel.

COM5/ArqA on Channel 26
11 pick,
12 Dave,
17 Really,
29 E4+1,
32 Movie Mix,
41 Food Network,
42 Travel Channel,
46 Challenge,
82 Sky News,
87 Community Channel,
36 Create and Craft,
37 Price Drop TV,
43 Gems TV 1.
There is also a number of Adult, Digital Radio and Text channels transmitted on this UHF channel.

I hope you get your missing stations back with rescanning the two channels.

P. Kieran Ward


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P. Kieran Ward's 89 posts GB
Monday, 18 November 2013
S
Samantha
2:46 PM
Carrickfergus

Hi, on Saturday evening I was experiencing major interference on UTV and a few other channels, by Sunday evening it was major interference or no signal on all channels. I did a full rescan and lost all channels, my tv could not pick up signal from any. Since then I have periodically manually and autoscanned and have managed to recover most of my channels except for channel 21 which includes UTV, Channel 5, ITV2 etc. Is this just a result of recent engineering and could I expect to recover these channels if I continue manually searching for channels on channel 21?
I'm in BT38 area.

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Samantha's 3 posts NO
P
PJH
sentiment_satisfiedSilver

3:23 PM

If your Divis aerial is diplexed with an RTE aerial just make sure you're not picking up Carnmoney Hill off the side of the beam Samantha. Have a look in the 800's just to see if UTV etc. is there.

This does happen on an initial scan on some of my boxes (even though Divis is the stronger signal) and if you're experiencing this (Carnmoney Hill would be fairly weak in your area) you may have to do a manual scan to restore the channels such as UTV etc.

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PJH's 240 posts GB
S
Samantha
3:50 PM
Carrickfergus

I did check the 800s and nothing there, I've never recieved RTE either so I don't think that's it. When I try to manually scan channel 21 the little box says no signal and the signal meter (good, normal, bad are the increments) is completely blank. Thanks for your reply though :)

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Samantha's 3 posts NO
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