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Freeview Light on the Mynydd Machen (Caerphilly, Wales) transmitter

first published this on - UK Free TV
sa_gmapsGoogle mapsa_bingBing mapsa_gearthGoogle Earthsa_gps51.604,-3.123 or 51°36'13"N 3°7'24"Wsa_postcodeNP11 7PS


The symbol shows the location of the Mynydd Machen (Caerphilly, Wales) transmitter which serves 31,000 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 Mynydd Machen (Caerphilly, Wales) mast?

Mynydd Machen transmitter - Mynydd Machen transmitter: Possible effect on TV reception week commencing 15/04/2024 Screen may go black 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 Mynydd Machen 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 max
C23+ (490.2MHz)411mDTG-400W
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

 V max
C26+ (514.2MHz)411mDTG-400W
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),

 V max
C29+ (538.2MHz)411mDTG-400W
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/V: aerial position (horizontal or vertical)

Are you trying to watch these 44 Freeview channels?

the effected channels
the effected channels
the effected channels
the effected channels

The Mynydd Machen (Caerphilly, Wales) mast is a public service broadcasting (PSB) transmitter, it does not provide these commercial (COM) channels: 4seven, 5Action, 5STAR, 5USA, Al Jazeera Eng, Al Jazeera English, Blaze, Blaze +1, Challenge, Channel 5 +1, Dave, Dave ja vu, DMAX, Drama +1, E4 Extra, YAAAS!, Film4 +1, Food Network, GREAT! action, GREAT! movies, GREAT! romance mix, GREAT! romance, HGTV, HobbyMaker, ITV2 +1, ITV3 +1, ITV4 +1, ITVBe +1, Legend, PBS America, Quest +1, Quest Red, Really, Sky Mix, Sky News, Talking Pictures TV, TCC, That's 90s, That's TV 2, Together TV, TRUE CRIME, TRUE CRIME XTRA, W, Yesterday +1.

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 Mynydd Machen transmitter?

regional news image
BBC Wales Today 1.2m homes 4.7%
from Cardiff CF5 2YQ, 14km south-southwest (213°)
to BBC Wales region - 206 masts.
regional news image
ITV Cymru Wales 1.2m homes 4.7%
from Cardiff CF5 6XJ, 19km southwest (215°)
to ITV Wales region - 206 masts.

How will the Mynydd Machen (Caerphilly, Wales) transmission frequencies change over time?

1984-971997-981998-20102010-1315 May 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 3 Mar 10 and 31 Mar 10.

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

Analogue 1-4 2kW
BBCA, D3+4, BBCB(-7dB) 400W

Which companies have run the Channel 3 services in the Wenvoe 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. Mynydd Machen 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.

Sunday, 23 September 2012
bev hurley
7:58 PM

Do you know when Mynydd Machen will be transmitting more freeview channels?
At the moment I have just the basic BBC/ITV/channel 4 & 5 channels

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bev hurley's 1 post GB flag
Dave Lindsay

8:10 PM

bev hurley: Never.

The Commercial broadcasters (those that don't transmit from Mynydd Machen) achieve coverage of 90% of the population from 81 of the largest transmitters (largest by viewer population). For them to transmit from the other 1,000 plus relays including Mynydd Machen would roughly double their transmission costs whilst only adding a potential 8.5% of the population to their viewer bases. As they operate purely for profit, they wish to acquire as many viewers as possible for least cost which is what they do.

Unless you are in a spot where you can receive the Commercial channels from a full-service transmitter, then you ain't gonna get them. In some parts of South Wales Mendip can be received. If this is possible at your location you may therefore be able to receive the Commercial channels, either by using a separate aerial and separate set-top box or by combining an aerial on Mendip with one on Mynydd Machen. What can be received and can't be received in your area varies over small distances because of the terrain.

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Dave Lindsay's 5,724 posts GB flag
Tuesday, 23 October 2012
Clive Porter
8:30 AM

What has happened to the Mynydd Machen Channel 23 / BBCA Multiplex this morning? All programs on this multiplex are "dead".
Have the engineers forgotten to turn it back on after their overnight engineering work?

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Clive Porter's 6 posts GB flag
David Badbach
8:54 AM

Clive: Yep, I'm in the RISCA area, but luckily I also have FreeSAT, so that's giving me a service. Wake up engineers - please!

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David Badbach's 2 posts GB flag
Clive Porter
12:58 PM

Mynydd Machen Channel 29 ?
Can anyone tell me what has become of the BBCB Multiplex (BBC One HD, BBC HD ITV1 HD etc.) on Mynydd Machen Channel 29?
I used to receive the channel 29 multiplex until around the time of the "re-tune" on 17 October. I've not been able to receive it since that date, maybe earlier as I don't watch HD very often.
I receive channels 23 and 26 from Mynydd Machen perfectly (100% signal 100% quality) but my (full HD) TV shows no signal at all on channel 29.

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Clive Porter's 6 posts GB flag
Tuesday, 9 April 2013
barrie wreford
3:21 PM

the problem with the mynydd machen transmitter is the design of the transmitting aerial,if you live close and low down the signal is poor,the further away you are the signal improves.i live about two and a half miles away line of sight in risca on a hill when we have the slightest high pressure i get picture breakup or no signal due to interference from stockland hill.that is with the correct group aerial mounted vertical and pointing at the mast.

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barrie wreford's 11 posts GB flag
Dave Lindsay

3:29 PM

barrie wreford: Can you not use the Risca relay, or even Wenvoe which would probably give you the full service?

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Dave Lindsay's 5,724 posts GB flag
Friday, 12 April 2013
barrie wreford
5:16 PM

hi dave,signals from risca tranmitter here are non exsistant as a hill in the way and kings weston hill is too strong eg set top aerial upstairs gives good pics.after switchover i was on wenvoe but a coppice of very large trees have grown taller and made viewing very bad especially in windy weather despite antiference group b xg9 on 12ft pole.i pick up coms bbc and and itv west by an aerial pointing at mendip and diplexed [triax a-e unit.many thanks barrie

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barrie wreford's 11 posts GB flag
Tuesday, 13 August 2013
K Wright
12:06 PM

CF83 2SS

Usually excellent freeview signal from set top aerial but nothing this morning even after resetting box. Tried re-installation and it only picked up 9 channels, (no BBC channels at all), presumably from a different transmitter as the signal is very poor.

Is there a fault with this transmitter today please?

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K Wright's 1 post GB flag
K's: mapK's Freeview map terrainK's terrain plot wavesK's frequency data K's Freeview Detailed Coverage
Wednesday, 14 August 2013
Dave Lindsay

1:10 PM

K Wright: The posting above says that Mynydd Machen was off air yesterday for a couple of hours.

BBC services should be tuned to UHF channel 23, this information is usually given on the signal strength screen.

C49 is Mynydd Bach, C60 is Abertridwr and C41 is Wenvoe.

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Dave Lindsay's 5,724 posts GB flag
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