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Full Freeview on the Preseli (Pembrokeshire, Wales) transmitter

first published this on - UK Free TV
sa_streetviewGoogle Streetviewsa_gmapsGoogle mapsa_bingBing mapsa_gearthGoogle Earthsa_gps51.944,-4.661 or 51°56'38"N 4°39'40"Wsa_postcodeSA41 3QR


The symbol shows the location of the Preseli (Pembrokeshire, Wales) transmitter which serves 57,000 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 Preseli (Pembrokeshire, Wales) mast?

Preseli transmitter - Preseli transmitter: Possible effect on TV reception week commencing 27/05/2024 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 Preseli 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
C43+ (650.2MHz)562mDTG-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
C46+ (674.2MHz)562mDTG-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
C40+ (626.2MHz)562mDTG-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
C42- (641.8MHz)562mDTG-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
C45- (665.8MHz)562mDTG-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
C39+ (618.2MHz)562mDTG-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 Preseli (Pembrokeshire, 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 Preseli transmitter?

regional news image
BBC Wales Today 1.2m homes 4.7%
from Cardiff CF5 2YQ, 111km east-southeast (118°)
to BBC Wales region - 206 masts.
regional news image
ITV Cymru Wales 1.2m homes 4.7%
from Cardiff CF5 6XJ, 110km east-southeast (120°)
to ITV Wales region - 206 masts.

Are there any self-help relays?

AbergynolwynActive deflectorGwynedd84 homes
CaerberllanActive deflector
Cwmtydu A/dActive deflector17 km NNE Newcastle Emlyn10 homes 50 caravans
DrefelinActive deflector20 km NNW Carmarthen36 homes
Poppit SandsActive deflector39 km NE Carmarthen Caravan Park
Rhyd-yr-onnenActive deflector20 km N Aberystwyth20 homes caravan site

How will the Preseli (Pembrokeshire, Wales) transmission frequencies change over time?

1962-80s1984-971997-981998-20092009-132013-182013-1731 Oct 2018
C39 +ArqB+ArqBArqB
C40BBC2wavesBBC2wavesBBC2waves +BBCB+BBCBBBCB

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 19 Aug 09 and 16 Sep 09.

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

Analogue 1-5 100kW
BBCA, D3+4, BBCB(-7dB) 20kW
SDN, ARQA, ARQB(-10dB) 10kW
Mux A*, Mux B*(-17dB) 2kW
Mux 1*, Mux 2*, Mux C*, Mux D*(-20dB) 1000W

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

Sep 1962-Jul 1964Wales (West and North) Television (Teledu Cymru)
Jul 1964-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.

Thursday, 12 March 2015
M Davies
2:24 PM

Transmitter engineering: Is com 5 off air today 12/03/15 Preseli?

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M Davies's 1 post GB flag
Dave Lindsay

3:48 PM

M Davies: See:

Digital UK - Planned Engineering Works

Preseli: "Possible service interruptions"

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Dave Lindsay's 5,724 posts GB flag
Friday, 17 April 2015
Transmitter engineering

1:31 PM

PRESELI transmitter - Freeview: BBC Digital TV Weak Signal from 11:58 today to 12:12 today. [BBC]

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Transmitter engineering's 151,731 posts xx flag
Saturday, 18 April 2015
Transmitter engineering

4:31 AM

PRESELI transmitter - Freeview: BBC Digital TV Weak Signal from 11:58 yesterday to 12:12 yesterday. [BBC]

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Transmitter engineering's 151,731 posts xx flag
Sunday, 19 April 2015
Transmitter engineering

4:30 AM

PRESELI transmitter - Freeview: BBC Digital TV Weak Signal from 11:58 on 17 Apr to 12:12 on 17 Apr. [BBC]

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Transmitter engineering's 151,731 posts xx flag
Sunday, 10 May 2015
9:17 PM

My post code is SA40 9RE, Llanybydder, Carmarthenshire, the house being about 800 ft above sea level. Reception for some channels, ITV 1,2,3,4, and freeview 19, 20,37 is poor or interrupted (loss of sound, breaking up picture, message saying no signal) IN WINDY WEATHER ONLY. BBC channels on the other hand seem unaffected. Could this be down to the my aerial (indoor, on window sill), or the presence of the BT telephone cable (extending from this side of the house to the telegraph pole to the west)which swings in heavy winds. Or is it because these channels come from different transmitters? Would getting an outdoor aerial fitted to house wall in a much higher position than the indoor aerial downstairs? I don't have an HD TV. I would be grateful for some suggestions to help remedy this problem which seems to be due to weather conditions. With thanks, DS.

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D,Sopher's 1 post GB flag
D,Sopher's: mapD's Freeview map terrainD's terrain plot wavesD's frequency data D's Freeview Detailed Coverage

10:59 PM

D,Sopher: What transmitter are you using?

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MikeB's 2,579 posts GB flag
Monday, 11 May 2015
Dave Lindsay

12:40 PM

D,Sopher: The short answer is yes, a roof-top aerial will likely improve reception quality, although it's possible that you may never achieve stable reception all the time, particularly of the Commercial (COM) channels.

There are some points you should be aware of - the long answer, if you will:

The terrestrial transmitter network post-switchover is a two-tier one with low power "filler in" transmitters only carrying Public Service (PSB) channels. An explanation of the reasons for this is here:

Londonderry (Northern Ireland) Freeview Light transmitter

In a situation such as yours where the inferior-coverage COM4-6 channels are inferior in terms of availability/reception (as against the PSBs) you may need to go further, such as use a roof-top aerial, or you may never achieve stable reception at all times on those channels.

Digital UK has published a list of all Freeview services here:

Digital UK Industry - Channel listings

COM7 and COM8 are the new quasi-national multiplexes carrying extra HD services, but these will not be available to you, even if you had a HD receiver.

Each multiplex or "mux" is a single signal. Thus, focus on one service from each multiplex.

UHF channel numbers (broadcast channels) are as follows for each transmitter:

PSB1 - BBC One | MP=C49 | P=C43
PSB2 - ITV | MP=C58 | P=C46
PSB3 - BBC One HD | MP=C54 | P=C40
COM4 - ITV3 | P=C42
COM5 - Pick | P=C45
COM6 - 4Music | P=C39

Transmitter abbreviations: MP=Mynydd Pencarreg; P=Preseli

The signal strength screen should tell you which UHF channel ("C") you are tuned to. As I say, look at one service per mux, the first of each being given above.

If you have poor reception of PSB2 (ITV, Channel 4, Channel 5 etc) then maybe it's tuned to Preseli and the good reception of PSB1 is because it's on Mynydd Pencarreg. Using the latter for PSB2 may achieve better reception and you may achieve this by either manual tuning or unplugging the aerial for the earlier part of the scan. If the automatic tuning scan only gives percentage then have it unplugged until, say 55%.

The following are terrain plots for each transmitter to your location:


Terrain between ( m a.g.l.) and (antenna m a.g.l.) - Optimising UK DTT Freeview and Radio aerial location

Mynydd Pencarreg:

Terrain between ( m a.g.l.) and (antenna m a.g.l.) - Optimising UK DTT Freeview and Radio aerial location

As you can see, you don't have line-of-sight with either, and so are having to rely on the effect of signal the bending around obstructions (signals travel in straight lines). So you may be lucky to get anything approaching a stable signal from an indoor aerial!

If you have some channels tuned to one transmitter and some to the other then they are each in almost opposite directions, so depending on the way your window faces you might be facing away from at least one of the transmitters! And for Preseli your aerial should be set horizontally and for Mynydd Pencarreg it should be vertical, for best possible reception.

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Dave Lindsay's 5,724 posts GB flag
Wednesday, 22 July 2015
Alan York
7:30 PM

At the moment ,unliKe in the past , I can only find listed channels via the channel guide on my remote for BBC TV and radio . Please tell me how to get all the other free view channels , which I had no trouble getting until recently . My post code is sa62 6rf , I live in St David's .

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Alan York's 1 post GB flag
Alan's: ...
Thursday, 23 July 2015

12:52 AM

Alan York : If by "other channels" you are meaning those such as ITV / Ch4 or Ch5? then carry out a reset on whatever you are using followed by a normal retune, if though on the other hand you are referring to such as ITV3 / Pick TV etc?, then you are (or were) possibly receiving them from the Preseli main station transmitter @ 26 miles / 83 degrees / aerial horizontally mounted, albeit that the DUK reception predictor indicates that reception in the post code area supplied is not possible from anywhere other than from the St Davids relay, (a few hundred yards away on a bearing of 351 degrees) this possibly being down to the line-of-sight signal from Preseli suffering from an obstruction at just under 1 mile away from your particular location.

The only reason for mentioning the latter (Preseli), being that a Google earth check revealed a small number of aerials in your area pointing in the direction of Preseli.

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jb38's 7,179 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.

If you have no satellite signal, see Sky Digibox says 'No Signal' or 'Technical fault'

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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