Full Freeview on the Mendip (Somerset, England) transmitter
 | Google Streetview |  | Google map |  | Bing map |  | Google Earth |  | 51.237,-2.626 or 51°14'12"N 2°37'33"W |  | BA5 3LB |
The symbol shows the location of the Mendip (Somerset, England) transmitter which serves 720,000 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 Mendip (Somerset, England) mast?
Mendip transmitter - Mendip transmitter: Possible effect on TV reception week commencing 05/06/2023 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 Mendip 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 Mendip transmitter?
ITV West Country News (East) 0.9m homes 3.4%
from Bristol BS4 3HG, 23km north (11°)
to ITV West region - 61 masts.
All of lunch, weekend and 50% evening news is shared with West Country (West)
Are there any self-help relays?
| Cheddar | Transposer | 15 km E Weston-super-Mare | 1674 homes |
| Luccombe | Active deflector | 6 km w Minehead | 38 homes |
How will the Mendip (Somerset, England) transmission frequencies change over time?
| 1984-97 | 1997-98 | 1998-2010 | 2010-13 | 2013-18 | 2013-17 | 27 Feb 2018 | |||
| C/D E | E | E | C/D E | C/D E T | W T | W T | |||
| C30 | _local | ||||||||
| C32 | BBCA | ||||||||
| C33 | com7 | com7 | |||||||
| C34 | D3+4 | ||||||||
| C35 | com8 | com8 | |||||||
| C36 | ArqB | ||||||||
| C37 | C5waves | C5waves | |||||||
| C48 | SDN | SDN | SDN | SDN | |||||
| C49tv_off | BBCA | BBCA | |||||||
| C51tv_off | LBS | LBS | |||||||
| C52tv_off | ArqB | ArqB | ArqB | ||||||
| C54tv_off | C4waves | C4waves | C4waves | D3+4 | D3+4 | D3+4 | |||
| C55tv_off | com7tv_off | ||||||||
| C56tv_off | ArqA | ArqA | ArqA | COM8tv_off | |||||
| C58tv_off | BBC1waves | BBC1waves | BBC1waves | BBCB | BBCB | BBCB | |||
| C61 | ITVwaves | ITVwaves | ITVwaves | BBCA | |||||
| C64 | BBC2waves | BBC2waves | BBC2waves |
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 24 Mar 10 and 7 Apr 10.
How do the old analogue and currrent digital signal levels compare?
| Analogue 1-4 | 500kW | |
| Analogue 5 | (-6dB) 126kW | |
| SDN, ARQA, ARQB, BBCA, D3+4, BBCB | (-7dB) 100kW | |
| com7 | (-8.4dB) 72.4kW | |
| com8 | (-8.6dB) 69.1kW | |
| Mux 1*, Mux 2*, Mux A*, Mux B*, Mux C*, Mux D*, LBS | (-17dB) 10kW |
Which companies have run the Channel 3 services in the Mendip transmitter area
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Saturday, 1 December 2012
B
Bob F3:49 PM
Stonehouse
I have just seen the following report "Culture Minister Ed Vaizey said an estimated 945,000 households which use signal amplifiers to boost their television reception could be affected, while another 953,000 which rely on communal aerials could have their coverage disturbed".
My post code is GL10 3BJ and I have a signal amplifier and receive Freeview via the Mendip Transmitter.
Should I expect to have a problem. And if so, what would you suggest would be the best solution please?
What is the
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Sunday, 2 December 2012
On the 'Transmission Frequencies' table above, it does not show what channel the BBCA multiplex is on for the columns headed '2013-' and '2013?' - I hear that in early-2013 BBCA will move from C61 to C49(?) - is this confirmed or subject to change, therefore it's been missed from the table?
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K
KMJ,Derby12:24 PM
Jeff Eastmond: Mux BBCA from Mendip changes to C49 0n 27th March 2013. This is taken from the Digital UK postcode checker site.
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Monday, 3 December 2012
R
Rob5:04 PM
Our signal on the BBC PSB1 mux is erratic and I'm not sure why. Some of the time it's OK at about 70% strength, other times it disappears to 'No signal'. However, all other muxes are fine, usually with 100% signal.
We're high up in the Cotswolds near Stroud, and have good line of sight to the Mendip transmitter. It's 40 miles away, but we're 600' ASL and the ground drops away sharply to the south, so there's no obvious problem, and Megalithia shows the signal path is good. Were in a rural area, so interference is unlikely.
Our aerial is on the same alignment as our neighbours, but is bigger (about 15 elements). It dates from analogue days when it was fine, and I dont think Mendip changed frequencies in the switchover.
Ive just left the digibox on manual search for a few minutes. On channel 61 (BBC PSB1 mux from Mendip) it shows a Signal Quality: Good, Signal Level mostly about 70%, but briefly dipping down to None a few times a minute. However, last night we tried to watch a BBC programme, which was OK for 45 minutes (but with very brief interruptions to sound), and then disappeared for the last 15 minutes. Channel 54 is currently showing Signal Quality: Very Good, Signal Level rock solid on 100%.
All of which leaves me very confused what problem can give an intermittent fault on one channel and leave the others unaffected. Does the larger aerial mean I should try an attenuator? Any help appreciated.
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Sunday, 23 December 2012
S
Stewart3:41 PM
Does anybody know the channel numbers for radio on a freeview from the Mendip traansmitter?
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S
Stewart3:46 PM
I know that they are in the 700 bracket of freeview channels. It's the tuning channel I need. Most of the TV channels are in the 50s & 60s, where are the radio channels?
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M
Michael4:31 PM
Stewart: The radio channels are carried in the same muxes as TV and data channels (BBC radio in the BBCA mux, others in SDN, ArqA and ArqB muxes) so there's no special radio tuning required. Which radio or TV channels are you missing in the 700s?
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Tuesday, 25 December 2012
K
k.Barrett8:40 PM
Wideband horizontally polarised chimney mounted aerial pointing at Mendip.
My house is SN40NW postcode (Butts Rd, Chiseldon.)
Megalith.com shows line of sight to Mendip obscured (just.)
4 way amp/splitter loft mounted.
Cheap single insulated airgap down cable but despite all the above reception has always been good.
Over the last two weeks freezing every 1 or 2 minutes for 3 or 4 seconds on BBC1 and occassionally BBC2.
I have checked the cables for damage and water ingress.
I have turned off dimmer switches, heating controls and under floor heating - no change but proves no interference from them.
I have bypassed the amp splitter with no improvement.
I have also replaced the chimney mounted aerial with a loft mounted wideband vertically polarised one pointing at Chiseldon repeater. Then repeated all the above tests and no improvement. I know wide band is not ideal for Chiseldon repeater but being less than 200yds and very clear line of sight it shouldn't be a problem should it.
Now Chiseldon and Mendip transmit BBC1 on different channels so is it other local interference or is the repeater just repeating a freezing channel from the main transmitter.
Do I ask neighbours if they are having problems, report to BBC or try something else like a group A aerial pointing at Chiseldon and Diplex the Chimney aerial as there are no problems from that on other channels.
Help please.
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J
jb389:43 PM
k.Barrett: Out of all that you have reported the most significant factor is you having stated that using the Chiseldon relay did not show any improvement either, because the Chiseldon relay receives its programmes from Mendip and this could indicate that the relay is also receiving a corrupted signal, therefore I would not advise altering anything at present before making some local enquiries for purposes of finding out if others are being affected in a similar way to yourself.
By the way, the fact of having a 16 watts transmitter so close to your location "is" very likely to have an effect on your tuner by slightly desensitising it, this happening no matter what channel you are trying to receive although obviously the effect will get worse the closer you get to frequencies used by the Chiseldon transmitters, although by the fact of the two stations not being that terribly far off right angles to each other plus them being on different polarities does help.
Chiseldon: 27 - 24 - 21 (@ 323 degrees)
Mendip: (43 miles @ 243 degrees) 61 - 54 - 58 - 48 - 56 - 52, please note though that channels 54 (ITV) & 58 (HD service) are classed as variable for reception.
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Wednesday, 26 December 2012
K
K.Barrett12:34 PM
JB38: Yes your reply is really confirming my suspicions and I will talk to neighbours. I was rather hoping that XMas day would give a reliable signal and I could perhaps think about local interference but XMas day was no better.
The local transmitter even at "only" 16 watts will have some effect as it can easily be received on my daughters cheap TV and got 48% signal and a good picture from just 15ft of cheap aerial cable that wasn't connected to an aerial or amp.
However,from previous tests and previous reliable signal I don't think it is that relay causing the problem.
In summer with lots of leaves on trees and the slightly obscured signal from Mendip I would expect it to be poor but why in winter and usually worst when we have clear rather than wet and wind days.
Talk to the neighbours it is then.
Although today it has been perfect. Do the transmitter maintainers read these pages and fix things without saying anything? Triple time to fix something on XMas day might help?
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