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Full Freeview on the Llanddona (Isle of Anglesey, Wales) transmitter

first published this on - UK Free TV
sa_streetviewGoogle Streetviewsa_gmapsGoogle mapsa_bingBing mapsa_gearthGoogle Earthsa_gps53.307,-4.128 or 53°18'25"N 4°7'41"Wsa_postcodeLL58 8YB


The symbol shows the location of the Llanddona (Isle of Anglesey, Wales) transmitter which serves 44,000 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 Llanddona (Isle of Anglesey, Wales) mast?

Llanddona transmitter - Llanddona transmitter: Possible effect on TV reception week commencing 20/05/2024 Pixelation or flickering on some or all channels Digital tick

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

Which Freeview channels does the Llanddona 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.

 H max
C40 (626.0MHz)255mDTG-20,000W
Channel icons
1 BBC One (SD) Wales, 2 BBC Two Wales, 9 BBC Four, 23 BBC Three, 201 CBBC, 202 CBeebies, 231 BBC News, 232 BBC Parliament, plus 14 others

 H max
C43- (649.8MHz)255mDTG-20,000W
Channel icons
5 Channel 5, 6 ITV 2, 10 ITV3, 13 E4, 14 Film4, 15 Channel 4 +1 South ads, 18 More4, 26 ITV4, 28 ITVBe, 30 E4 +1, 35 ITV1 +1 (Wales),

 H max
C46 (674.0MHz)255mDTG-20,000W
Channel icons
46 5SELECT, 101 BBC One HD Wales, 102 BBC Two HD Wales, 104 Channel 4 HD South ads, 105 Channel 5 HD, 106 BBC Four HD, 110 Channel 4 HD (Wales), 204 CBBC HD, 205 CBeebies HD, plus 1 others

 H -3dB
C41 (634.0MHz)255mDTG-810,000W
Channel icons
 E4 (Wales), 20 Drama, 21 5USA, 29 ITV2 +1, 32 5STAR, 33 5Action, 38 Channel 5 +1, 41 Legend, 42 GREAT! action, 57 Dave ja vu, 58 ITV3 +1, 59 ITV4 +1, 64 Blaze, 67 TRUE CRIME, 68 TRUE CRIME XTRA, 78 TCC, 81 Blaze +1, 91 WildEarth, 93 ITVBe +1, 209 Ketchup TV, 210 Ketchup Too, 211 YAAAS!, 267 Al Jazeera English, plus 30 others

 H -3dB
C44 (658.0MHz)255mDTG-810,000W
Channel icons
11 Sky Mix, 17 Really, 19 Dave, 31 E4 Extra, 36 Sky Arts, 40 Quest Red, 43 Food Network, 47 Film4 +1, 48 Challenge, 49 4seven, 60 Drama +1, 65 That's TV 2, 70 Quest +1, 74 Yesterday +1, 75 That's 90s, 233 Sky News, plus 11 others

 H -3dB
C47 (682.0MHz)255mDTG-810,000W
Channel icons
12 Quest, 25 W, 27 Yesterday, 34 GREAT! movies, 39 DMAX, 44 HGTV, 52 GREAT! romance, 56 That's TV (UK), 63 GREAT! romance mix, 71 That’s 60s, 73 HobbyMaker, 82 Talking Pictures TV, 84 PBS America, 235 Al Jazeera Eng, plus 18 others

DTG-8 64QAM 8K 3/4 27.1Mb/s DVB-T MPEG2
H/V: aerial position (horizontal or vertical)

The Llanddona (Isle of Anglesey, Wales) 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 Llanddona transmitter?

regional news image
BBC Wales Today 1.2m homes 4.7%
from Cardiff CF5 2YQ, 210km south-southeast (164°)
to BBC Wales region - 206 masts.
regional news image
ITV Cymru Wales 1.2m homes 4.7%
from Cardiff CF5 6XJ, 213km south-southeast (165°)
to ITV Wales region - 206 masts.

How will the Llanddona (Isle of Anglesey, Wales) transmission frequencies change over time?

1950s-80s1984-971997-981998-20092009-132013-182013-1714 Nov 2018

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 21 Oct 09 and 18 Nov 09.

How do the old analogue and currrent digital signal levels compare?

Analogue 1-4 100kW
BBCA, D3+4, BBCB(-7dB) 20kW
SDN, ARQA, ARQB(-10dB) 10kW
Mux 1*, Mux 2*, Mux A*, Mux B*, Mux C*, Mux D*(-20dB) 1000W

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

Jan 1958-Jul 1968Television Wales and the West
Jul 1968-Feb 2004Harlech Television
Feb 2004-Dec 2014ITV plc
Feb 1983-Dec 1992TV-am•
Jan 1993-Sep 2010GMTV•
Sep 2010-Dec 2014ITV Daybreak•
• Breakfast ◊ Weekends ♦ Friday night and weekends † Weekdays only. Llanddona 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.

Tuesday, 7 December 2021
Mel Nevitt
1:23 PM

I live most of the year at LL54 5RS. and have recently purchased a LG oled smart TV. We have a hightail aerial pointing towards Llandonna transmitter on Anglesey. We borrowed a Panasonic TV to test the reception before we decided to have a TV in our home. The Panasonic was able to receive BBC HD BBC 2 HD and all ITV HD channels.
The LG channel search will not find Channels 101, 102 etc and nothing between 100 to 201??
I have either not got a setting right on the TV or those channels are not available from the Llandonna transmitter. I am 75 and just venturing into the world of a television . Please help. Cofion Mel

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Mel Nevitt's 1 post GB flag
Mel's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage

2:29 PM

Mel Nevitt: Your postcode is predicted to have good reception from Llanddona which is only 22km away. You should certainly be able to receive BBC One HD, BBC Two HD, ITV HD, Channel 4 HD & Channel 5 HD on 101-105 as these channels are broadcast from every transmitter. Try going in to the manual tuning option on the TV's menu and do a scan of UHF channel 46.

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StevensOnln1's 3,638 posts GB flag
Saturday, 18 December 2021
Mark Scarratt
11:01 PM

I live in Dwygyfylchi and experience regular issues of interference of multiple TV channels
Probably about 2 or 3 times per month I have issues with all BBC channels but never all channels at the same time. The latest issues are today 18/12/21

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Mark Scarratt's 1 post GB flag
Sunday, 19 December 2021

3:12 AM

Mark Scarratt:

I assume you mean the BBC SD channels today (18/12) or does that include the HD ones as well?
When exactly was the previous occasion?

I can't find any faults listed for the transmitter and it's not been listed for Planned Engineering since the end of October. Most parts of your area should have very good reception from Llanddonna but without a full postcode the predicted reception in your locale can't be confirmed, it's possible you may be in an awkward spot!

It's possible that your problem today is weather related.
There is currently some moderate to strong temperature inversion/tropospheric ducting conditions affecting large parts of the UK and these weather conditions can disrupt reception for brief or longer periods. The conditions are predicted to last on and off for a few days.
The BBC currently have a warning in place.

That said there are a number of things worth checking.

Is your aerial external or loft mounted? How old is it (roughly)? Do you have a distribution amp/splitter?
Have you changed anything in your set up since this first started?

I would check that your aerial seems intact and pointing in the correct direction and that your downlead looks undamaged (especially if it is old) and not flapping in the wind if external. Also check all your coax plugs, connections, flyleads etc, behind the TV, unplug connectors check for corrosion or other problems and reconnect them. Flyleads are a common problem, try swapping/changing them.

If you ever retuned at anytime when you had no signal, that's never recommended as it usually just clears the correct tuning or you may end up tuned to weak signals from another transmitter.

Check in your TV's Tuning Section that you are tuned to the correct UHF channels for Llanddonna. These are C40, C43, C46, C41, C44, C47 in the order PSB1/BBCA, PSB2/D3&4, PSB3/BBCB HD, SDN/COM4, ArqA/COM5, ArqB/COM6
To be clear, the Main BBC SD Channels would be on multiplex BBCA UHF channel C40.

Check that you don't have any trees that have grown high that are on the line of sight to the transmitter (or very very close by) or things like scaffolding or new buildings.

See what signal strengths and quality you are getting for the multiplexes (groups of channels) shown in your TV's tuning section, that information may indicate issues with your aerial or downlead or possibly any distribution amp/splitter you may have.

Problematic connections, water ingress etc. can seem to affect reception of just an individual or several multiplexes.

Make sure you don't have any HDMI leads near unscreened/poorly screened flyleads/aerial leads as HDMI has been known to cause interference.

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Chris.SE's 4,187 posts GB flag
Saturday, 1 January 2022
Mark Roberts
6:16 PM

why dont i have a signal on my freeview tv upstairs this was ok when i went to bed last night have tried to re tune still nothing my post code is ll61 6ny llanfairpwll.

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Mark Roberts's 2 posts GB flag
Mark's: ...

11:13 PM

Mark Roberts:

The transmitter hasn't had any current or recent reported faults and isn't currently listed for Planned Engineering.

You don't mention whether your upstairs TV has a separate aerial.
If it's the same aerial as the downstairs TV, does that have a signal?
Has the signal returned now to the Upstairs TV?
If so, it was probably the weather conditions at the time.
There has been some Temperature Inversion/Tropospheric Ducting which has been disrupting signals in various parts of the UK for some.

Essentially it results in interfering signals from other transmitters in the UK or Europe reaching you and so your wanted signals are disrupted. It won't necessarily affect all multiplexes or necessarily at the same time if more than one. It can last for seconds, minutes, sometimes hours or longer.
Despite the incorrect spelling, this link does work - simple technical explanation….jpg

It's always possible these conditions may affect you again during the next 24hrs according to some current predictions.

If you continue to have problems, post back with more detail about your aerial installation(s), any distribution amp/splitter etc.

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Chris.SE's 4,187 posts GB flag
Friday, 14 April 2023
Transmitter engineering

9:46 AM

Llanddona transmitter - Llanddona transmitter: Possible effect on TV reception week commencing 10/04/2023 Pixelation or flickering on some or all channels [DUK]

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Transmitter engineering's 151,526 posts GB flag
Monday, 17 April 2023
Transmitter engineering

4:07 AM

Llanddona transmitter - Llanddona transmitter: Possible effect on TV reception week commencing 17/04/2023 Pixelation or flickering on some or all channels [DUK]

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Transmitter engineering's 151,526 posts GB flag
Friday, 19 May 2023
Transmitter engineering

10:08 AM

Llanddona transmitter - Llanddona transmitter: Possible effect on TV reception week commencing 15/05/2023 Pixelation or flickering on some or all channels [DUK]

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Transmitter engineering's 151,526 posts GB flag
Monday, 22 May 2023
Transmitter engineering

4:08 AM

Llanddona transmitter - Llanddona transmitter: Possible effect on TV reception week commencing 22/05/2023 Pixelation or flickering on some or all channels [DUK]

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Transmitter engineering's 151,526 posts GB flag
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