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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Sunday, 3 April 2011
L
Lee10:17 AM
Pontypridd
I have been having a poor picture over the last few weeks. It has been fine till then. I haver had the aerial man (Valley aerial) out twice in this time. He states it should be boosted in April so from then on no problems. He has moved the aerial from chimney to barge boards but it is no better. I am in Tonteg but should I ask him to point it elsewhere. It appears to be pointing to Caerphilly, it is not down towards Wenvoe and next stoor is on Mendips. Surely I shouldn't be having these problems from 4 miles away from a transmitter?
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Lee's: mapL's Freeview map terrainL's terrain plot wavesL's frequency data L's Freeview Detailed Coverage
Hi Lee,
On the 27th of April, two sets of channels(muxes) will be both moved into group B band & increased in power. The changes should make the signal better on those muxes & the reception of the channels on those muxes will improve.
The changes will affect only people who get their reception directly from wenvoe, it will not affect those on relay transmitters such as mynydd machen.
If only some channels are affected the you should wait until 27th april, if the bbc / itv 1 / channel 4 / channel 5 channels are breaking up, then the april changes will not help.
I would add that I dont know Valley Aerials personally but I do know they have a good reputation & are members of the best trade association the CAI.
Mark Aberfan Aerials
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M
Mike Dimmick7:24 PM
Reading
Lee: The relays are only there to fill in gaps in reception. You ought to get best results from the main station at Wenvoe. There's a hill (western end of Garth Hill) between you and it, but the transmitter is so strong that even the much-reduced signal should still be strong enough.
The Mynydd Machen relay is only designed to serve the valley to its north, and possibly part of Machen itself. The map here is hopelessly wrong because Brian hasn't integrated the actual radiation pattern of the transmitter, and his terrain data is too imprecise.
The Pontypridd relay to your north looks to be blocked by the hill just to your north at Coed y Fardre. At only 400W there likely isn't enough signal getting through.
There is also a relay at Taffs Well to your south-east, only 10W but no obstructions (there's a hill, Maesbach, but you can see over it). That's your best option if Wenvoe and Mendip aren't possible.
For best results from Wenvoe you should have a Group B aerial, horizontally-polarized (rods going side-to-side), pointing slightly east of south. For Mendip, a Group C/D horizontally-polarized pointing slightly north of south-east. For Taffs Well, Group C/D *vertically* polarized (rods going up-and-down) pointing slightly south of east.
A wideband will work reasonably well for group C/D transmitters, less well for group B.
The commercial multiplexes at Wenvoe are boosted on the 27th of April, and you'll need to retune because the frequencies are changing. However, if your problem is with BBC channels, ITV1, S4C, Channel 4 or Channel 5, or with HD services, nothing will improve because nothing is changing - these are in their final channels and modes and at final power levels at all of the transmitters you could use.
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Mike's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
Sunday, 15 May 2011
G
glen 8:57 PM
Before you go and spend money on Freesat you should note it does not have 'Dave' or 'Dave ja vu' on it,
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Tuesday, 29 November 2011
D
david marasco11:51 PM
Newport
I have fitted a high gain wideband digital ariel on roof cannot pick anything up at all,is this the right ariel.
kind regards
d.t.marasco
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david's: mapD's Freeview map terrainD's terrain plot wavesD's frequency data D's Freeview Detailed Coverage
Wednesday, 30 November 2011
K
KMJ,Derby1:36 AM
david marasco: There is no prediction from Digital UK for reception from Mynydd Machen. You are however predicted to have excellent reception from Mendip and Wenvoe is also shown as a likely possibility. For Mendip mount the aerial for horizontal polarisation and point it at 144 degrees (SE), For Wenvoe the polarisation is also horizontal, the direction being 234 degrees or roughly SW. Note that predicted reception does not take into account local obstructions such as trees or tall buildings.
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Tuesday, 6 December 2011
C
Chris7:36 PM
Caerphilly
Will channel 5HD be available from Machen? If so when? Any chance of Channel 4 HD?
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Chris's: mapC's Freeview map terrainC's terrain plot wavesC's frequency data C's Freeview Detailed Coverage
Wednesday, 14 December 2011
Sunday, 25 March 2012
K
kris11:52 AM
Caerphilly
hello, can you please tell me,if you can;when will we be able to get channel 4 and 5 on freeviw hd via the aerial in Llanbradach cf83 3ny ? can you help with info. THANKS.
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kris's: ...
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