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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.

This transmitter has no current reported problems

The BBC and Digital UK report there are no faults or engineering work on the Mynydd Machen (Caerphilly, Wales) transmitter.

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: 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, GREAT! action, GREAT! movies, GREAT! romance, 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, TCC, 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?

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.

Monday, 14 March 2011
Transmitter engineering

4:34 PM

MYNYDD MACHEN transmitter - Freeview BBC Digital TV Off Air from 15:07 today to 15:10 today [BBC]

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Transmitter engineering's 153,057 posts xx flag
Tuesday, 15 March 2011
Transmitter engineering

4:35 AM

MYNYDD MACHEN transmitter - Freeview BBC Digital TV Off Air from 15:07 yesterday to 15:10 yesterday [BBC]

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Transmitter engineering's 153,057 posts xx flag
Thursday, 17 March 2011
Transmitter engineering

5:31 PM

MYNYDD MACHEN transmitter - Freeview HD Digital TV Off Air from 14:02 yesterday to 14:06 yesterday HD Digital TV Off Air from 12:56 yesterday to 12:57 yesterday [BBC]

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Transmitter engineering's 153,057 posts xx flag
Transmitter engineering

6:27 PM

MYNYDD MACHEN transmitter - Freeview HD Digital TV Off Air from 12:56 yesterday to 12:57 yesterday HD Digital TV Off Air from 14:02 yesterday to 14:06 yesterday [BBC]

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Transmitter engineering's 153,057 posts xx flag
Sunday, 3 April 2011
10:17 AM

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 1 post GB flag
Lee's: mapL's Freeview map terrainL's terrain plot wavesL's frequency data L's Freeview Detailed Coverage
Mark Aberfan Aerials

12:50 PM

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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Mark Aberfan Aerials's 1,059 posts GB flag
Mike Dimmick

7:24 PM

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 Dimmick's 2,486 posts GB flag
Mike's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
Sunday, 15 May 2011
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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glen's 1 post GB flag
Sunday, 12 June 2011
Transmitter engineering

8:36 PM

MYNYDD MACHEN transmitter - Freeview BBC Digital TV Off Air from 19:09 today [BBC]

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Transmitter engineering's 153,057 posts xx flag
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