Full Freeview on the Wenvoe (Cardiff, Wales) transmitter
 | Google Streetview |  | Google map |  | Bing map |  | Google Earth |  | 51.460,-3.282 or 51°27'35"N 3°16'57"W |  | CF5 6SA |
The symbol shows the location of the Wenvoe (Cardiff, Wales) transmitter which serves 360,000 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 Wenvoe (Cardiff, Wales) mast?
Wenvoe transmitter - Wenvoe transmitter: Possible effect on TV reception week commencing 11/11/2024 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.
64QAM 8K 3/4 27.1Mb/s DVB-T MPEG2
DTG-12 QSPK 8K 3/4 8.0Mb/s DVB-T MPEG2
H/V: aerial position (horizontal or vertical)
Which Freeview channels does the Wenvoe 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.
64QAM 8K 3/4 27.1Mb/s DVB-T MPEG2
DTG-12 QSPK 8K 3/4 8.0Mb/s DVB-T MPEG2
H/V: aerial position (horizontal or vertical)
Which BBC and ITV regional news can I watch from the Wenvoe transmitter?
BBC Wales Today 1.2m homes 4.7%
from Cardiff CF5 2YQ, 6km northeast (42°)
to BBC Wales region - 206 masts.
ITV Cymru Wales 1.2m homes 4.7%
from Cardiff CF5 6XJ, 1km east-northeast (74°)
to ITV Wales region - 206 masts.
Are there any self-help relays?
| Abergwesyn | Active deflector | 7 km N Llanwrtyd Wells | 20 homes |
| Barry | Transposer | 10 km SW city centre | 300 homes |
| Celtic Manor | Transposer | 5 km E Newport | 80 homes |
| Pentrebach | Transposer | 3 km S Merthyr Tydfil | 100 homes |
| Ystradfellte | Active deflector | 30 km NE Port Talbot | 20 homes |
How will the Wenvoe (Cardiff, Wales) transmission frequencies change over time?
| 1950s-80s | 1984-97 | 1997-98 | 1998-2010 | 2010-13 | 2013-18 | 2013-17 | 15 May 2019 | ||
| VHF | B E T | B E T | B E T | B E T | B E K T | W T | W T | ||
| C5 | BBCtvwaves | ||||||||
| C30 | LOCAL2 | ||||||||
| C31 | com7 | com7 | |||||||
| C37 | com8 | com8 | |||||||
| C39 | +ArqB | +ArqB | ArqB | ||||||
| C41 | ITVwaves | ITVwaves | ITVwaves | +BBCA | +BBCA | +BBCA | BBCA | ||
| C42 | +SDN | +SDN | +SDN | SDN | |||||
| C44 | BBC1waves | BBC1waves | BBC1waves | D3+4 | D3+4 | D3+4 | D3+4 | ||
| C45 | +ArqA | +ArqA | +ArqA | ArqA | |||||
| C47 | C4waves | C4waves | C4waves | BBCB | BBCB | BBCB | BBCB | ||
| C49tv_off | +ArqB | ||||||||
| C51tv_off | BBC2waves | BBC2waves | BBC2waves | LCF | LCF | ||||
| C55tv_off | com7tv_off | ||||||||
| C56tv_off | COM8tv_off |
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 | 500kW | |
| BBCA, D3+4, BBCB | (-7dB) 100kW | |
| com8 | (-9.7dB) 53.2kW | |
| SDN, ARQA, ARQB | (-10dB) 50kW | |
| com7 | (-10.3dB) 47kW | |
| Mux 1*, LCF | (-17dB) 10kW | |
| Mux 2*, Mux A*, Mux B*, Mux C*, Mux D* | (-20dB) 5kW |
Which companies have run the Channel 3 services in the Wenvoe transmitter area
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Monday, 10 September 2012
I am able to pick up a signal from wenvoe which includes bbc hd, itv hd etc, however film 4 and both sky sports channels (via bt vision are very pixellated. my aerial is located outside on the side of my house but is above the overall height of my property.
i currently live in bedwas and am blocked from using mynydd machen transmitter by a hillside. I am able to get a signal from mendip but cannot get hd channels? any help would be greatly welcomed
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justin's: mapJ's Freeview map terrainJ's terrain plot wavesJ's frequency data J's Freeview Detailed Coverage
Tuesday, 11 September 2012
justin ball: The COM channels may be pixelated because the Van Terrace transmitter broadcasts on them. It is two miles away and on a bearing only 9° anti-clockwise of Wenvoe. Oh, and it is horizontally polarised as well. Unless you can move your aerial to somewhere where it will be able to "see" Wenvoe, but where it will be blocked from the interfering Van Terrace, then you're not going to be able to pick up the COMs from Wenvoe.
Even if the hill wasn't in the way, Mynydd Machen is a PSB-only transmitter, so you would be no better off. This means that it doesn't carry Film4 or Sky Sports, to name but a few.
The predictor suggests that you have a good chance of receiving from Mendip. Have you tried manually tuning to C58 for its HD (switching to DVB-T2 mode if there is an option)? Do you have two aerials or are you tuning to one of the transmitters with the aerial not facing the right way?
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Wednesday, 12 September 2012
Thank you dave, Ive turned my aerial too mendip and have a decent signal! just gutted i cant watch the welsh sport and news channels!...Thanks for your advice. been a great help.
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justin's: mapJ's Freeview map terrainJ's terrain plot wavesJ's frequency data J's Freeview Detailed Coverage
justin ball: I was going to suggest that you may be able to have two aerials and combine the two feeds into one downlead with a diplexer. However, looking at the channels used by Mendip's COMs and Wenvoe's PSBs, this isn't going to be possible.
Mendip's COMs are on 48, 56, 52
Wenvoe's PSBs are on 41, 44, 47
You could combine these with a diplexer that "splits" at C51, but you will loose the ability to receive SDN from Mendip on C48. You will also attenuate C52 a bit because there is a slope down to the split.
Whilst you could probably do without HD from Wenvoe (on C47), and instead use Mendip's on C58, I don't believe that there is a diplexer available that splits somewhere between 44 and 48...
It is a pity that you can't receive from Mynydd Machen as, whilst it doesn't broadcast the COM channels, it does use channels in the 20s which would be ideal for combining with Mendip.
I was also going to suggest that the diplexer could be sited indoors behind your TV so as to allow you to remove it without needing to get a ladder. This would, of course, require two downleads whereas mounting it on the aerial mast you only mean the one.
The other possibility is to have two aerials with two feeds to your living room and feed them into two different receivers. Perhaps use Mendip except where there are regional variations that you wish to watch.
If you might wish to record these variations and you only have a conventional set-top box for Wenvoe, but have a PVR on Mendip, then you could perhaps feed the set-top box into the PVR via scart.
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justin ball: For lots of information and products, see ATV Sheffield's site A.T.V (Aerials And Television) TV Aerial, DAB Aerial, FM Aerial.
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Thursday, 13 September 2012
justin ball: I have fitted a labgear PUH141 4 way masthead amplifier with variable gain....how do i change the gain on this please?? its supplied with a psm114v supply. (51.5953,-3.1920)
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J
jb3811:22 PM
justin ball: The variable gain adjustment is made on the power unit which is usually sited behind the TV, this meaning that you do not require to enter the loft or wherever the booster / splitter is located.
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Friday, 14 September 2012
justin ball: on this labgear power unit i cant see the adjustment screw, its not on the outside of the unit so im pretty stumped now. (51.5953,-3.1920)
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justin ball: ok ive installed a 4 way masthead amp. whilst running one feed to my bt vision box last night the picture was very pixellated, Ive since run 2 more feeds to tv's around the home and the picture is now very much improved but still some distortion. would it be wise to fit a attenuator? as it seems to me that by splitting the signal off too 2 other rooms IT has actually reduced what was 'to strong' a signal. ADVICE MUCH APPRECIATED. (51.5953,-3.1920)
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J
jb3811:26 PM
justin ball: I suspect that you have the PSM114 power unit and not the PSM114V type as was mentioned in your posting, as a PSM114V and a PUH141 amp provides amplification ranging from 10-20db via the adjustment screw located in a small hole on the bottom left hand face side of the power supply.
I will say though that the tuners fitted in BT Vision boxes leave a lot to be desired when compared to the likes of Panasonic or Humax types, but rather than experiment with attenuators which can be iffy in operation, and especially the cheap variable 0-20db gain types which in no way are as stable as the fixed versions, I would think about purchasing the proper PSM114V power supply as that is much smoother in operation and likewise gives superior results.
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