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Freeview Light on the Black Mountain (Northern Ireland) transmitter

first published this on - UK Free TV
sa_gmapsGoogle mapsa_bingBing mapsa_gearthGoogle Earthsa_gps54.586,-6.024 or 54°35'10"N 6°1'28"Wsa_postcodeBT17 0LU


The symbol shows the location of the Black Mountain (Northern Ireland) transmitter which serves 6,600 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 Black Mountain (Northern Ireland) transmitter.

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

Which Freeview channels does the Black Mountain 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.

 V -26dB
C41 (634.0MHz)486mDTG-5W
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, plus 14 others

 V -26dB
C44 (658.0MHz)486mDTG-5W
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, 28 ITVBe, 30 E4 +1, 35 UTV +1 (UTV),

 V -26dB
C47 (682.0MHz)486mDTG-5W
Channel icons
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

 H max
C33+ (570.2MHz)486mDTG-112,000W
Channel icons
53 TG4, 54 RTÉ One, 55 RTÉ Two,

DTG-11 QPSK 32KN 2/3 10.0Mb/s DVB-T2 MPEG4
H/V: aerial position (horizontal or vertical)

The Black Mountain (Northern Ireland) mast is a public service broadcasting (PSB) transmitter, it does not provide these commercial (COM) channels: .

If you want to watch these channels, your aerial must point to one of the 80 Full service Freeview transmitters. For more information see the will there ever be more services on the Freeview Light transmitters? page.

Which BBC and ITV regional news can I watch from the Black Mountain 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.

How will the Black Mountain (Northern Ireland) transmission frequencies change over time?

1959-80s1984-971997-981998-20122012-134 Sep 2019

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 5 50kW
NIMM≡(-14dB) 2kW
Analogue 1-4(-33dB) 25W
BBCA, D3+4, BBCB(-40dB) 5W

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.

Is the transmitter output the same in all directions?

Radiation patterns withheld

Saturday, 3 October 2020
denis campbell

4:20 PM

3rd October 2020.

Aerial: 8 el yagi in the roofspace, into a multiswitch feeding 6 apartments.
I am on the top floor about 15m asl

Divis at 34km los:
The 100kW muxes are showing signal "strength" of 10.
The 50kW muxes are showing 9.
Mux 36, listed as being 5kW is showing 5.
Mux 55, listed as being 12kW is showing 7.

Black Mountain at 33km los:
Mux 33, listed as 2kW is giving 7. It must be a lot more than 2kW.
This is a rebroadcast of four RTE channels, programmes ar often not available due to broadcasting rights.

The figures are from my Panasonic DVR, which shows signal strength of 0 to 10, an arbitary figure.
RTE from Claremont Carn at 55km gives a useable signal on Mux 42 and 45 using a 14 ele Log Periodic on my balcony. Saorview shows TV channel numbers in the 800 series on my Freeview tuner - to avoid confusion with the Freeview.

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denis campbell's 24 posts GB flag

10:03 PM

denis campbell:

Well what can I say, except to update you on some of the information that's not been updated on this site -
Divis, Local mux on C36, power was increased to 10kW when it moved from C30 on 4th Sept.2019.
Divis, COM7 on C55, power changed to 8.9kW when it moved from C51 on 4th March 2020.
Black Mountain, NIMM on C33, power increased to 3kW when it moved from C39 on 4th Sept.2019.
The reason that the NIMM on C33 gets to you with such a good signal is that it's modulation is the more resilient QPSK (which some say is the equivalent of 10x that using 64QAM) but doesn't have the bandwidth.

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Chris.SE's 4,184 posts GB flag
Monday, 1 April 2024
A.J. Sheehan
7:30 PM

I used to receive the Black Mountain NIMM via an attic aerial and 'TVHeadend' software (to distribute it to various TVs) for some years past; in the last two months the NIMM (i.e. the four RTE channels) has disappeared completely from my reception though every other channel is working. I have changed nothng in my hardware or software setup and am baffled by this remarkably specific 'blackout' - only the NIMM, nothing else.

Can anyone advise, please?

link to this comment
A.J. Sheehan's 2 posts GB flag
A.J.'s: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
Tuesday, 2 April 2024

1:33 AM

A.J. Sheehan:

You are surrounded by a large number of Mobile phone masts and if you put your postcode into…ure/ you'll see you should have received a postcard from Restore TV.

It's highly probable that you are suffering some interference from one or more masts which could be reducing the sensitivity of your receiving equipment and so appearing like a loss of signal.
You may also have lower strength on other multiplexes which may not be apparent if it hasn't actually had an affect on the pictures/sound.

Whatever, I would contact Restore TV and explain you are seeing some periodic pixilation and occasional loss of signal and request a Free Filter - I wouldn't specifically say it's just the NIMM mux.
The filter should be fitted between the aerial and you first piece of equipment. If the input to that equipment is an F-connector, make sure you request an F-connector version rather than coax plug.

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Chris.SE's 4,184 posts GB flag
A.J. Sheehan
7:17 PM

Chris.SE: Thank you for your prompt reply! I have contacted Restore TV as you advised and will report any answer from them.

link to this comment
A.J. Sheehan's 2 posts GB flag
A.J.'s: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage

11:36 PM

A.J. Sheehan:

Thanks for that, do keep us updated, and if we can help with any further suggestions if you still have problems.

link to this comment
Chris.SE's 4,184 posts GB flag
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Your comment please
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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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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