Full Freeview on the Llanddona (Isle of Anglesey, Wales) transmitter
 | Google Streetview |  | Google map |  | Bing map |  | Google Earth |  | 53.307,-4.128 or 53°18'25"N 4°7'41"W |  | LL58 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 14/10/2024 Pixelation or flickering on some or all channels 
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Digital television services are broadcast on a multiplexes (or Mux) where many stations occupy a single broadcast frequency, as shown below.
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 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.
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?
BBC Wales Today 1.2m homes 4.7%
from Cardiff CF5 2YQ, 210km south-southeast (164°)
to BBC Wales region - 206 masts.
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-80s | 1984-97 | 1997-98 | 1998-2009 | 2009-13 | 2013-18 | 2013-17 | 14 Nov 2018 | ||
| VHF | C/D E | C/D E | C/D E | E T | E T | E T | B E T | ||
| C1 | BBCtvwaves | ||||||||
| C40 | ArqB | ArqB | BBCA | ||||||
| C41 | SDN | ||||||||
| C43 | SDN | SDN | SDN | D3+4 | |||||
| C44 | ArqA | ||||||||
| C46 | ArqA | ArqA | ArqA | BBCB | |||||
| C47 | ArqB | ||||||||
| C50tv_off | ArqB | ||||||||
| C51tv_off | _local | _local | _local | _local | |||||
| C53tv_off | C4waves | C4waves | C4waves | BBCB | BBCB | BBCB | |||
| C57tv_off | BBC1waves | BBC1waves | BBC1waves | BBCA | BBCA | BBCA | |||
| C60tv_off | ITVwaves | ITVwaves | ITVwaves | -D3+4 | -D3+4 | -D3+4 | |||
| C63 | BBC2waves | BBC2waves | BBC2waves |
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
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Saturday, 1 January 2022
C
Chris.SE11:13 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
https://www.bbc.co.uk/rec….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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Friday, 13 October 2023
D
David Griffiths1:47 PM
Bodorgan
We live in Llangristiolus, LL62 5PS and are currently getting quite gab interfearance on all channels on TV.. I see that bas reception is predicted for week biginning 9th October,
Can you please tell me when we can expect normal service to return?
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David's: mapD's Freeview map terrainD's terrain plot wavesD's frequency data D's Freeview Detailed Coverage
C
Chris.SE2:45 PM
David Griffiths:
The Planned Engineering may not be helping, but you are only 17km from the transmitter with a clear line-of-sight and there are no specific faults listed, so the most likely cause will be the recent weather conditions.
Severe Tropospheric Ducting occurred with the recent high pressure.
It was unusually intense on this occasion. It can be quite variable, come and go within seconds, minutes or hours. It doesn't necessarily affect all multiplexes at the same time or at all and not everyone will be affected, it will depend on location. At times it can wipe out your reception.
People in different parts of the UK and Europe have been experiencing problems.
Do NOT retune. IF you had been correctly tuned it is never advised to Retune when you've lost signal or it's badly pixellated be it due to weather, engineering or faults etc. as it can often clear your correct tuning. You just have to be patient and wait for normal conditions, you can't tune to signals that aren't there or have bad interference.
If you did retune at any point and channels are missing from your EPG then the best option is to try a manual retune for the multiplex UHF channels that you are missing.
See Channel listings for Industry Professionals | Freeview for a full list of which TV programme channels are on which multiplex.
The correct UHF channel numbers are listed in the top section of the page (although the TV programme lists may not be up-to-date).
As far as the Planned Engineering is concerned, I'm afraid Arqiva never give details of the work or how long it will last, especially as some may be weather dependant.
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Tuesday, 13 August 2024
I
Ian W. Paisley12:09 PM
Llandudno
We have a problem with poor reception in my area, LL30 1UJ often the TV is searching for a signal, could it be the Great Orme is blocking the signal. What is the best compass setting for the Llanddona antenna from my address? What is the best aerial I could buy to improve the signal? Thanks
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Ian's: mapI's Freeview map terrainI's terrain plot wavesI's frequency data I's Freeview Detailed Coverage
S
Steve Donaldson4:44 PM
Ian W. Paisley: The first thing to do is check you are in fact tuned to Llanddona for all channels and that you aren't tuned to another transmitter.
At your location, Moel-y-Parc is in roughly the opposite direction to Llanddona, and this could be being picked up off the back of your aerial. While Moel-y-Parc is only 21.7 miles away, Nant-y-Gamar is in the way.
The Freeview digital programme channels are carried on six multiplexes, each multiplex being a single signal. The designations and names of the six multiplexes are as follows:
PSB1 = BBC A (BBC standard definition TV and radio)
PSB2 = D3&4 (ITV1, Channel 4, S4C, Channel 5 and some sister channels)
PSB3 = BBC B (all HD channels, BBC and non-BBC)
COM4 = SDN
COM5 = Arq A
COM6 = Arq B
Freeview has published a list of programme channels by multiplex ("mux") here:
Channel listings for Industry Professionals | Freeview
The UHF (broadcast) channels used by transmitters which might be available at your location are as follows. They are given in the order of the six multiplexes listed above:
Llanddona 40, 43, 46, 41, 44, 47
Moel-y-Parc 45, 39, 42, 33, 36, 48
Winter Hill 32, 34, 35, 29, 31, 37
Conwy 33, 36, 48
As a relay, Conwy carries only PSBs, hence it has just three channels. Also, it is co-channel with Moel-y-Parc's COM channels, so if you can pick up anything on those UHF channels, it will be one transmitter or the other.
You should check the signal information/strength screen to see you are actually tuned to Llanddona for at least one programme channel on each multiplex.
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In terms of reception from Llanddona, it would seem you are in an excellent reception area. You are 13 miles out from the transmitter and, barring any local obstruction, have clear line-of-sight. This terrain plot shows your location on the left and the transmitter on the right:
Terrain between ( m a.g.l.) and (antenna m a.g.l.) - Optimising UK DTT Freeview and Radio aerial location
Click the link underneath to see a line between the two points. It goes nowhere near the Great Orme. The bearing, according to the Freeview Detailed Coverage Checker, is 269 degrees.
If this is an issue that has existed for a long time then I suggest you investigate whether some attenuation to bring the signal level down resolves it (having checked you are tuned correctly):
Freeview signals: too much of a good thing is bad for you | free and easy for 21 years
Before digital switchover (DSO) the low-power digital signals from Llanddona were all 1kW. Today, all six channels are 20kW. In particular, were a high gain aerial to have been installed prior to DSO so as to pick up the weaker digital signals, the transmission power increase at DSO could potentially result in too high a signal level coming down the cable from the aerial.
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If this is a recent problem then mobile phone masts operating on frequencies that were previously used for TV can be a problem sometimes, the solution to which is usually to fit a filter.
Restore TV is the organisation responsible for alleviating such issues. It sends out free filters.
It notifies addresses whose reception might be affected by postcard. It says it has not sent a postcard to addresses in your postcode, although there have been cases where no postcard has been sent but the issue turned out to be mobile signal interference:
https://restoretv.uk/post…ure/
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Monday, 7 October 2024
Transmitter engineering
10:47 AM
10:47 AM
Llanddona transmitter - Llanddona transmitter: Possible effect on TV reception week commencing 07/10/2024 Pixelation or flickering on some or all channels [DUK]
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Monday, 14 October 2024
Transmitter engineering
5:11 AM
5:11 AM
Llanddona transmitter - Llanddona transmitter: Possible effect on TV reception week commencing 14/10/2024 Pixelation or flickering on some or all channels [DUK]
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Transmitter engineering
5:11 AM
5:11 AM
Llanddona transmitter - Llanddona transmitter: Possible effect on TV reception week commencing 14/10/2024 Pixelation or flickering on some or all channels [DUK]
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