Freeview Light on the Mynydd Machen (Caerphilly, Wales) transmitter
 | Google map |  | Bing map |  | Google Earth |  | 51.604,-3.123 or 51°36'13"N 3°7'24"W |  | NP11 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 18/11/2024 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.
H/V: aerial position (horizontal or vertical)
The Mynydd Machen (Caerphilly, Wales) mast is a public service broadcasting (PSB) transmitter, it does not provide these commercial (COM) channels: U&Yesterday, 4seven, 5Action, 5STAR, 5USA, Al Jazeera Eng, Al Jazeera English, Blaze, Blaze +1, Challenge, Channel 5 +1, DMAX, E4 Extra, YAAAS!, Film4 +1, Food Network, FRANCE 24 (in English), GREAT! action, GREAT! christmas, GREAT! movies, GREAT! romance mix, 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, That's 90s, That's TV 2, Together TV, TRUE CRIME, TRUE CRIME XTRA, U&Dave, U&Dave ja vu, U&Drama +1, U&W.
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 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.
| Mux | H/V | Frequency | Height | Mode | Watts |
| PSB1 BBCA | V max | C23+ (490.2MHz) | 411m | DTG- | 400W |
 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 | V max | C26+ (514.2MHz) | 411m | DTG- | 400W |
 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 | V max | C29+ (538.2MHz) | 411m | DTG- | 400W |
 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 | |||||
Are you trying to watch these 44 Freeview channels?
The Mynydd Machen (Caerphilly, Wales) mast is a public service broadcasting (PSB) transmitter, it does not provide these commercial (COM) channels: U&Yesterday, 4seven, 5Action, 5STAR, 5USA, Al Jazeera Eng, Al Jazeera English, Blaze, Blaze +1, Challenge, Channel 5 +1, DMAX, E4 Extra, YAAAS!, Film4 +1, Food Network, FRANCE 24 (in English), GREAT! action, GREAT! christmas, GREAT! movies, GREAT! romance mix, 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, That's 90s, That's TV 2, Together TV, TRUE CRIME, TRUE CRIME XTRA, U&Dave, U&Dave ja vu, U&Drama +1, U&W.
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?
BBC Wales Today 1.2m homes 4.7%
from Cardiff CF5 2YQ, 14km south-southwest (213°)
to BBC Wales region - 206 masts.
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?
| 1984-97 | 1997-98 | 1998-2010 | 2010-13 | 15 May 2019 | |||||
| A K T | A K T | A K T | A K T | A K T | |||||
| C23 | ITVwaves | ITVwaves | ITVwaves | +BBCA | BBCA | ||||
| C26 | BBC2waves | BBC2waves | BBC2waves | +D3+4 | D3+4 | ||||
| C29 | C4waves | C4waves | C4waves | +BBCB | BBCB | ||||
| C33 | BBC1waves | BBC1waves | BBC1waves |
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
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Friday, 15 March 2019
B
barrie wreford9:04 AM
mynydd machen off air from about 0.8:15 on friday 15/03/2019
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Saturday, 2 October 2021
J
John Bowen 11:59 AM
I often have no freeview signal during heavy rain from Mynydd Machen transmitter. No signal today. Is there a problem with the location of this transmitter during poor weather?
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C
Chris.SE2:14 PM
John Bowen :
Reception will be dependant on location, we need a full postcode to look at the predicted reception for you locale, you may not be getting a strong enough signal.
There is another possibility, your aerial connections or downlead may have degraded and water is getting in which will severely affect the signal arriving at your set. How old (roughly) is the aerial and downlead?
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Thursday, 28 March 2024
S
StevensOnln17:22 PM
G.pugh: Presumably it will come back on once the fault listed in the engineering post above yours has been fixed. This is an independent technical help website, we don't have any more information on faults or engineering work than what is already publicly available.
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C
Chris.SE8:53 PM
G.pugh:
Apart from Mynydd Machen, which is now line-fed rather than a relay of Wenvoe, two other transmitters which are relays via Mynydd Machen, are off-air, Wattsville and Pennar.
I suspect with the atrocious winds there have been there'll be a power cut somewhere that's causing this.
The BBC are still reporting them as off-air, but the reports may not yet have been updated and you may have your signals back. If not, do NOT retune as it'll likely just clear your correct tuning.
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Tuesday, 2 April 2024
A
Anthony Riddiford9:35 PM
Transmitter engineering: WE ARE ABSOLUTELY SICK OF THIS MAST GOING DOWN EVER SINCE EE GOT INVOLVED ITS DOWN EVERY FEW DAYS AND TODAY IT WAS 4 HRS AND ITS GONE AGAIN AT 9:20 DURING THE DECIDING FRAME OF THE SNOOKER!!!... THATS OUR LOT WE ARE GOING BACK TO SATELLITE ABSOLUTE JOKE WE CAN PICTURES FROM MARS BUT NOT FROM 4 MILES DOWN THE ROAD!!!
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S
StevensOnln111:27 PM
Anthony Riddiford: I'm not sure what you mean about EE getting involved (they may share the mast for their mobile base station but have nothing to do with transmitting Freeview) but there have been multiple faults recorded today, which may well be related to damage caused by the recent storms.
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C
Chris.SE11:34 PM
Anthony Riddiford:
Transmitter engineering do not read here or post here. The information is collated from Engineering pages. EE have no involvement in the TV or other broadcast transmitters, I don't know where you get that idea from!
Yes, the BBC have reported that the transmitter went off air due to a fault at 9.20pm
It may have escaped your attention but there were some severe winds the other day, and reading between the lines of the information available, one of the outages was due to the feed to the transmitter being affected by a power cut affecting several parts of the NP11 postcode area.
That cut appears to have had some other consequences. Details of faults are never provided by Arqiva (who are responsible for the transmitter maintenance etc.) nor by the BBC.
It could be that temporary repairs were made to restore power and some interruption has occurred since to make more permanent repairs. It's even possible that the antenna were damaged by the winds and interruptions would be needed to make repairs.
Two other transmitters are affected by the same issue as they are linked relays, Wattsville and Pennar.
Transmitters are not routinely interrupted for the fun of it!
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Wednesday, 3 April 2024
S
Selwyn Stephens2:17 PM
Caerphilly
My post code is CF83 3FH ADDRESS 58 MILL RD CaerphillY
We do not have freeview ,Just the normal BBC and ITV CHANNELS
We have had a number of :no signal messages over the past 2/3 days and no TV at all for long periods
No info on the reason
Can you please advise?
This is happening now as I write. I n the past no problem....why/
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Selwyn's: mapS's Freeview map terrainS's terrain plot wavesS's frequency data S's Freeview Detailed Coverage
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