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 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 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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Wednesday, 30 March 2016
MikeP
8:05 AM
8:05 AM
Steve Poile:
There is also the issue about terrain. Some of the hills around Wellington, Somerset may make reception from one or other of the main transmitters somewhat difficult. A Post Code will allow examination of the terrain and reception predictions for a particular area. These would show as the blue boxes below ypur submission, like those below this for my location.
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Tuesday, 19 April 2016
D
Dr J Harvey12:39 PM
Hi, I live in the Chippenham area and we used to have good reception of all the multiplex channels including SDN & BBCA. Recently SDN has moved to C48 which is adjacent to the BBCA mux on C49 and we now have appalling/ unwatchable reception on all program channels on C48 & C49 as evidenced by signal measurements giving good signal strength but very poor and highly variable signal quality for BOTH C48 & C49 (other muxes still give good reception).
I understand that in RF planning one never collocates transmissions on adjacent frequency bands on a given transmitter as this reduces the usable range on these bands arising from increased cross interference.
I would prefer not to have to move to satellite reception or internet to receive Freeview programs.
Why has this been done and are there any plans to move either of these muxes to other frequency bands in the near future to avoid this problem ?
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Friday, 22 April 2016
Lost signal on com7 C33 (570.0MHz) in the BA1 6xx area of Bath.
I performed a reset (first-time-install) on the tv and all programmes in that block have now been removed from the EPG.
Any advice please?
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J
jb387:06 PM
fade2gray: Mendip is listed on this weeks engineering page with the status of "possible weak signal", the most likely reason for your problem.
If you had refrained from retuning your Freeview device the signal would have returned of its own accord, as the channel would still have been stored in the tuners memory system, retuning having deleted same, as things are, the only way of restoring it is by carrying out a "manual" tune on Mux C33 now and again in the hope that the signal level has risen high enough for the tuner to lock on to it.
By the way, the only reason a manual tune was suggested is to avoid upsetting the programmes already stored.
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@ Dr J Harvey, I would suggest checking that your aerial hasn't been moved out of alignment with the signal during stormy weather. Then check that the cable is OK. If both are fine, I would suggest that maybe you need a higher gain aerial or just possibly attenuation of the signal. The best thing to do is seek the services of an aerial installer. There is no reason why your system shouldn't work on channels 48 and 49. Unlike analogue, digital signals on adjacent channels do not interfere with each other.
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Charles's: mapC's Freeview map terrainC's terrain plot wavesC's frequency data C's Freeview Detailed Coverage
Thursday, 28 April 2016
N
nicholas9:28 PM
Hi,i would do a replacement of all the cable and the aerial if it old,try an indoor aerial and scan to see what
the local field strength is like.You could try inverting the aerial,inverted signal was a chronic vhf problem
in areas of swindon.Try aerial at ground level,local buildings can cause chronic moving fading problems
where the signal are bound around like a yo-yo
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N
nicholas9:35 PM
JC: Hi,loss of signal can be due to inversion loss,in vhf days,swindon was badly affected due to the
signals being twisted by the terain,try inverting the aerial,try at ground level,but perhaps replace all
coax and plugs first.
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N
nicholas9:43 PM
Hi,it seems lot of the problems here are caused by signal twisting,absolutely chronic in vhf days,try in all
cases,renew all coaxial cable and plugs,get indooor aerial and scan to see what the local field strength
is like,relocating the aerials,try ground level but also inverting the aerials,signal twisting may be yr problem,local high buildings can cancel one or more channels,the signals are bounced around like
a yo-yo.
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Saturday, 14 May 2016
T
Tim11:26 PM
To Dr. Harvey of Chippenham,The issue of adjacent channels is no longer relevant because the mechanism used for Freeview to transmit a multiplex uses thousands of low bandwidth carriers tightly packed together. This means that its use of the spectrum is almost rectangular with no leakage so no problem in packing in another one in right next door.I am also of the Chippenham area and get consistent 100% quality and ~45% strength on cha 48 and 49, something else must be wrong.If you still have the aerial from times when analogue TV existed you may want to change it for a wideband "log periodic" one combined with a masthead amp, this will future proof you for when the signals really leave the original band in 2019 and overall will give you better reception characteristics.Tim.
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Sunday, 15 May 2016
MikeP
4:13 PM
Trowbridge
4:13 PM
Trowbridge
Tim
Having previously lived near Chippenham, I am aware that most parts of the town do not need any amplification at all provided that a good quality aerial is being used, we used to have an 11 element Group C/D Yagi without amplification and had excellent reception. Generally, age does not matter as long as the condition of the terminals is good without any corrosion and the cable is in good condition.
I agree a good log-periodic will make the installation as future-proof as possible, bearing in mind that we do not know for certain what the channel allocation plans are much beyond 2020.
Note also that there is no such thing as a 'digital aerial' as all UHF aerials can receive the Freeview signals - they are standard RF signals carrying a modulation. That used to be in an analogue format but is now in a digital format - but the RF signal has not changed at all. The modulation format makes no difference to the ability of an aerial to receive the carrier signal.
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MikeP's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
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