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 22/04/2024 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 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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Friday, 29 September 2023
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Chris6:12 PM
Hi Steve, yeh i had that sent last year to me, was no help, then i also bought a booster recently with filter in it, no joy, i have a compass here, do i point the aerial 50 degrees ? thx
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Steve Donaldson7:04 PM
Chris: According to the Freeview predictor, Mendip is pretty much the only transmitter available in your area, so all aerials should be pointing the same way. Mendip is on a bearing of 254 degrees. 50 degrees would be almost the opposite direction. The elements on the aerial should be flat, meaning it is horizontally polarised. If the elements are "X" shape rather than straight/flat then the longer parts should be closer to horizontal than vertical.
Use the signal strength/quality screen on your TV and/or box. Don't just rely on whether the picture becomes visible or not. If you have more than one receiver (e.g. a box and a TV) then survey them all to see what information they give. Some might be more helpful than others in terms of the detail they give, as in quality and errors.
If there are any HDMI cables behind your TV, try moving them away from the aerial cable because they can interfere, potentially with one or two but not all channels.
Does the issue happen at particular times? Is it constant (when it does happen) or is it intermittent? Are there times when it doesn't happen?
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Chris.SE7:23 PM
Chris:
You should not need a "booster" in your location, signals on all multiplexes are predicted to be very good UNLESS you are splitting the signal using a passive splitter to supply more than one set, OR your aerial is in the loft where the signal will be weaker than an external aerial.
What make/model is this booster?
Where have you got it located?
The filter in it needs to be the B700 type, if it's B800 it won't filter the latest mobile signals.
As Steve has mentioned, check in your TV Tuning section for Signal strength and Quality figures. Anything less than 100% Quality indicates a problem, which could be too much signal which can have similar effects to a weak signal or interference.
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Steve Donaldson7:30 PM
Chris: Do you know whether neighbours have the same issue?
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Chris7:49 PM
Thx guys, signals from my LG tv that has signal test, shows anything from 50% to 75% on all 6 Main transmitter channels, all the booster box says is, it filters 3G/4G and 5G/LTE, and works 88-694MHz from Argos One for All, i got the booster at the end of the aerial cable, then tv aerial into one of the 4 inputs, aerial has the main input, when i tried test signal with no booster, the strengths were all the same as with booster, its a 23 dB booster as well, regarding Transmitter, all aerials around my road seem to be pointing 50 degrees on my compass, well there are 2 outer circles on compass, 1 to 64, thats where i get the 50 from, and a inner circle 0 to 360, thats pointing 282.
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Chris7:53 PM
Oh, close neighbours i know have cable, i have asked them before, whats a pain is, last few hours all channels been fine, but then tomorrow could all be bad, and what i dont understand is, why only the batch of freeview channels on C48 (690.0MHz) give me a problem, all other channels fine, there all on the same transmitter, so i would think they either all breakup or there all good, thx
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Chris8:08 PM
Some times we can go days without a problem, then some days its breaking up all day, there is no pattern to it.
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Chris.SE8:46 PM
Chris:
I know the amp, I have one, it's quite a good amp and it's an SV9604. The 23dB gain is overall it's less than that per output. But no matter.
It sounds like the aerial is a bit off beam, as Steve mentioned it should be 254 degrees but no matter for the moment.
You mention the Signal strength figures, but haven't given the Quality figures. I'm afraid the strength figures in isolation as not very meaningful. Can you please give the Quality figures for each multiplex ideally both with the amp in circuit and without it.
Sources of interference (mobile signals perhaps) will usually affect the frequency of the nearest TV channel to them, in this case C48.
You haven't mentioned where the aerial is, which could be helpful. How old is it roughly? Has it been changed in the last 10 years?
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Chris10:07 PM
Aerial brand new the last week, 49 element horizontal, loft, has a great picture when working, just C48 freeview channels are effected, if it was mobile signal interference, would it not be all the time ?
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Chris.SE10:17 PM
Chris:
One might have thought mobile signal interference might be constant, but some cases I've heard about are all unexpectedly different.
Do you have any older equipment that may have an RF output that gets switched on periodically such a Games consoles, a Video recorder, an old Sky box & etc.?
Do you have any neighbours who might be radio amateurs?
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