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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 28/10/2024 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
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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.

MuxH/VFrequencyHeightModeWatts
PSB1
BBCA
 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

PSB2
D3+4
 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), 71 That’s 60s,

PSB3
BBCB
 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

COM4
SDN
 H -3dB
C42- (641.8MHz)562mDTG-810,000W
Channel icons
 E4 (Wales), 20 U&Drama, 21 5USA, 29 ITV2 +1, 32 5STAR, 33 5Action, 38 Channel 5 +1, 41 Legend, 42 GREAT! action, 57 U&Dave ja vu, 58 ITV3 +1, 59 ITV4 +1, 64 Blaze, 67 TRUE CRIME, 68 TRUE CRIME XTRA, 81 Blaze +1, 91 WildEarth, 93 ITVBe +1, 209 Ketchup TV, 210 Ketchup Too, 211 YAAAS!, 251 Al Jazeera English, 255 FRANCE 24 (in English), 265 Rok Sky +1, plus 29 others

COM5
ArqA
 H -3dB
C45- (665.8MHz)562mDTG-810,000W
Channel icons
11 Sky Mix, 17 Really, 19 U&Dave, 31 E4 Extra, 36 Sky Arts, 40 Quest Red, 43 Food Network, 47 Film4 +1, 48 Challenge, 49 4seven, 60 U&Drama +1, 65 That's TV 2, 70 Quest +1, 74 &UYesterday +1, 76 That's TV 2 MCR, 233 Sky News, plus 13 others

COM6
ArqB
 H -3dB
C39+ (618.2MHz)562mDTG-810,000W
Channel icons
12 Quest, 25 U&W, 27 U&Yesterday, 34 GREAT! movies, 39 DMAX, 44 HGTV, 52 GREAT! christmas, 56 That's TV (UK), 63 GREAT! romance mix, 73 HobbyMaker, 75 That's 90s, 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
VHFB E TB E TB E TW TK TK TK T
C8ITVwaves
C30_local_local_local_local
C37C5wavesC5waves
C39 +ArqB+ArqBArqB
C40BBC2wavesBBC2wavesBBC2waves +BBCB+BBCBBBCB
C42-SDN-SDN-SDNSDN
C43ITVwavesITVwavesITVwaves+BBCA+BBCA+BBCABBCA
C45-ArqA-ArqA-ArqAArqA
C46BBC1wavesBBC1wavesBBC1waves+D3+4+D3+4+D3+4D3+4
C49tv_off+ArqB
C50tv_offC4wavesC4wavesC4waves+BBCB

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.

Comments
Monday, 10 August 2020
A
Adam Jackson
8:36 PM

PSB2 is now on Ch34 not 46 as stated here.

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Adam Jackson's 9 posts GB flag
C
Chris.SE
sentiment_very_satisfiedPlatinum

11:21 PM

Adam Jackson:

I'm afraid you are wrong old chap. It is still on 46.
You are most likely picking up PSB2 from the Fishguard relay which is not too surprising considering your location. If your aerial is still pointing at Trefin you should be getting it on C22. If you've recently retuned, changes in reception might be due to strong Tropospheric Ducting which has intermittently been affecting different parts of the UK in recent days.

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Chris.SE's 4,344 posts GB flag
Tuesday, 1 September 2020
C
Chris.SE
sentiment_very_satisfiedPlatinum

10:07 AM

All:

I'm guessing Preseli may be on essential engineering maybe due to the above reports as all TV muxes appeared to go off-air just before 1045. All back on air at time of posting. I note that virtually all its relays are on Planned Engineering with "Possible service interuptions".

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Chris.SE's 4,344 posts GB flag
Saturday, 5 September 2020
S
Stuart Jones
7:26 AM
Tenby

Hi
We are having problems with keeping a signal on our free view box. We are on a caravan site at New Hedges in Tenby SA70 8TR. We have reset numerous times but the picture constantly freezes and goes off regularly to no signal being received.
Our aerial is fitted in the window pointing the same way has all others on the site and I believe this to be the Preseli transmitter.
We have turned off all phones, CD player laptops etc but no improvement.

Could you help in diagnosing the problem.
Many thanks
Mr Jones

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Stuart's: mapS's Freeview map terrainS's terrain plot wavesS's frequency data S's Freeview Detailed Coverage
Sunday, 6 September 2020
C
Chris.SE
sentiment_very_satisfiedPlatinum

2:18 AM

Stuart Jones:

The predicted transmitter for your location is indeed Preseli which should give you the most reliable signals. The COM multiplexes may be slightly less reliable than the PSBs. The aerial should have its rods horizontal and be pointing at a bearing of 8 degrees (that's east of due N).
You can also receive a number of other transmitters in that location with less releibale signals that may be more variable or poor.

I suggest the first thing to check is that you are tuned to the correct UHF channels for Preseli by going to your set's tuning section, they are C43, C46, C40, C42, C45, C39 in the order BBCA/PSB1, D3&4/PSB2, BBCB-HD/PSB3, SDN/COM4, ArqA/COM5, ArqB/COM6.
You may be able to check best in Manual tuning if you have that option, but you may have others such as Signal Test or similar. (Ignore PSB3 if your set hasn't got an HD/T2 tuner).

If you find you are not tuned to these UHF channels, unplug the aerial and carry out an automatic retune which should clear all previous tuning as nothing should be found. Plug the aerial back in an ideally carry out a manual tune for the correct UHF channels.

If you are tuned to the correct channels, then check your aerial connections and coax plug for any poor or broken connections. Is your aerial a Wideband or Group B suitable for Preseli and does it have a similar number of elements to others there that are receiving satisfactory signals?

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Chris.SE's 4,344 posts GB flag
Wednesday, 22 December 2021
A
Adam Jackson
4:28 PM

I've been having problems with one mux for about a week now, all others are fine. Going from usual signal levels to extremely low signal strength/quality to nothing at all. Aerial and cabling seems to be fine so unsure what's happening. The mux in question is PSB2 CH22.

The other muxes PSB1 CH25, PSB3 CH28 Freeview and SV1 CH23 and SV2 CH26 Saorview all unaffected.

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Adam Jackson's 9 posts GB flag
Thursday, 23 December 2021
C
Chris.SE
sentiment_very_satisfiedPlatinum

3:50 AM

Adam Jackson:

There has been moderate Temperature Inversion/Tropospheric Ducting affecting large parts of the UK for several days, it sometimes accompanies high pressure.
Do NOT retune, it will more likely remove your correct tuning.

These conditions are predicted to ease late on Wednesday by the end of the night
Despite the incorrect spelling, this link does work - simple technical explanation
https://www.bbc.co.uk/rec….jpg

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.

The BBC have had a warning on their Works and Warnings page for a few days, and Freeview had added one on Wednesday (better late than never!) but at that time it was then mainly affecting the S & SE.


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Chris.SE's 4,344 posts GB flag
Wednesday, 13 December 2023
A
Alexander Scott
9:57 AM

Signal the last couple of months has been horrendous ; sometimes non existant our aerial is outside on a pole in the field. Postcode SA311TX

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A
Alexander Scott
10:03 AM

Last few months signal has been very poor ,sometimes non exiistant we live in Elim Road Carmarthen .our aerial is outside on a pole in the field.Postcode SA311TX

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S
Steve Donaldson
sentiment_satisfiedSilver

2:35 PM

Alexander Scott: The first thing to check is that your TV is in fact tuned to Preseli and not Carmel, which would mean that the broken or non-existent picture you have been watching is actually from Carmel. The other thing to note is that there is a mobile phone mast which could potentially (but in no way definitely) be interfering with TV reception at your postcode. There are other possible causes of the issue, such as a problem with your aerial system, but I will expand on these two for now.

You may know this and be familiar, as it is a common issue, even back in the days of analogue. At your location Carmel is in the opposite direction to Preseli and it is on lower UHF channels, thereby being found before Preseli during the TV's automatic tuning scan.

The channels for Preseli are:

PSB1 - BBC One - C43
PSB2 - ITV - C46
PSB3 - BBC One HD - C40
COM4 - QVC - C42
COM5 - Sky Mix - C45
COM6 - Quest - C39

Check the signal strength screen for the programme channels shown above to see that the UHF channel numbers, prefixed 'C', are those of Preseli.

For reference, Carmel's in the same order are: 23, 26, 29, 33, 36, 48

If the TV is tuned to Carmel then this needs correcting. Manually tuning the six Preseli channels may be the only way to achieve this effectively and easily.

The other observation I have made is that Restore TV says it sent postcards to your postcode notifying you of the fact that a mobile phone base station in your area had begun operating in the 700MHz or 800MHz bands, these previously used for TV, and that this could potentially cause interference with TV reception. Restore TV is the organisation charged with alleviating such issues and will send out a free filter to block the higher frequencies now used by mobile phones.

I note there is the nearby lattice tower at the fire station with mobile phone antennae on. While it is supposition and isn't forced to be this mast, it is nonetheless close by.

If you have an amplifier (masthead amp) with your aerial then the filter will need to be fitted before it, so that the mobile phone signal does not enter the amplifier. In cases where someone has a masthead amp then a waterproof outdoor filter is supplied, and you will need to tell Restore TV this when you ring them. They usually send an engineer to fit it. However, this is usually on the rooftop, and if your aerial is on a pole I have no idea whether they can do this, if it means climbing the pole to access it.

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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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