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Full Freeview on the Mendip (Somerset, England) transmitter

first published this on - UK Free TV
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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 18/09/2023 Pixelation or flickering on some or all channels Digital tick

Choose from three options: ■ List by multiplex ■ List by channel number ■ List by channel name

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.

 H max
C32 (562.0MHz)591mDTG-100,000W
Channel icons
1 BBC One (SD) West, 2 BBC Two England, 9 BBC Four, 23 BBC Three, 201 CBBC, 202 CBeebies, 231 BBC News, 232 BBC Parliament, 250 BBC Red Button, plus 16 others

 H max
C34 (578.0MHz)591mDTG-100,000W
Channel icons
3 ITV 1 (SD) (West), 4 Channel 4 (SD) South ads, 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 (West),

 H max
C35 (586.0MHz)591mDTG-100,000W
Channel icons
46 5SELECT, 101 BBC One HD West, 102 BBC Two HD England, 103 ITV 1 HD (ITV Meridian Southampton), 104 Channel 4 HD South ads, 105 Channel 5 HD, 106 BBC Four HD, 109 BBC Three HD, 204 CBBC HD, 205 CBeebies HD, plus 1 others

 H max
C48 (690.0MHz)591mDTG-8100,000W
Channel icons
20 Drama, 21 5USA, 29 ITV2 +1, 32 5STAR, 33 5Action, 38 Channel 5 +1, 41 Legend, 42 Great! Movies Action, 57 Dave ja vu, 58 ITVBe +1, 59 ITV3 +1, 64 Blaze, 67 CBS Reality, 69 HorrorXtra, 78 TCC, 81 Blaze +1, 89 ITV4 +1, 91 WildEarth, 203 CITV, 208 Pop Player, 209 Ketchup TV, 210 Ketchup Too, 211 YAAAS!, plus 16 others

 H max
C33 (570.0MHz)591mDTG-8100,000W
Channel icons
 Smithsonian Channel, 11 Sky Arts, 17 Really, 19 Dave, 31 E4 Extra, 36 pick, 40 Quest Red, 43 Food Network, 47 Film4 +1, 48 Challenge, 49 4seven, 60 Drama +1, 70 Quest +1, 71 That's 60s, 74 Yesterday +1, 75 That's 70s, 233 Sky News, plus 9 others

 H max
C36 (594.0MHz)591mDTG-8100,000W
Channel icons
 Quest Red +1,  Classic Hits, 12 Quest, 25 W, 27 Yesterday, 34 GREAT! movies, 39 DMAX, 44 HGTV, 52 GREAT! romance, 73 HobbyMaker, 76 That's 80s, 82 Talking Pictures TV, 83 Together TV, 84 PBS America, 90 Together TV +1, 235 Al Jazeera Eng, plus 19 others

 H -10dB
C30 (546.0MHz)591mDTG-1210,000W
Channel icons
from 22nd September 2014: 7 Made in Bristol,

DTG-8 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?

regional news image
BBC Points West 0.9m homes 3.4%
from Bristol BS8 2LR, 25km north (3°)
to BBC West region - 60 masts.
regional news image
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?

CheddarTransposer15 km E Weston-super-Mare1674 homes
LuccombeActive deflector6 km w Minehead38 homes

How will the Mendip (Somerset, England) transmission frequencies change over time?

1984-971997-981998-20102010-132013-182013-1727 Feb 2018
C49tv_off BBCABBCA

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

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. Mendip 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.

Tuesday, 2 August 2011
4:34 PM


> There is a list of the switchover order ...

Thank you - that is a very useful site and just what I was looking for!
Nothing in the weeks before 27 July (in case it was delayed) or the weeks after (in case it was brought forward) seems relevant. The closest is Sudbury (London) upped the power of ArqA on Ch 60 to 100kW on 20 July, but I cannot see that being a problem with Mendip Ch 61. The other Sudbury mplex are on 41, 47, 56 and 58 so again no problem.

My line of sight to Cork is across water - do you think I could be getting Irish (or continental?) co-channel inteference?

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John-Ha's 8 posts GB flag

5:20 PM

John-Ha: I'm still not sure what your postcode is, but you won't get a signal from the RoI or Sudbury (Essex) in the Bristol area.

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Briantist's 38,899 posts GB flag
Mike Dimmick

6:50 PM

Briantist: You may not get a detectable signal from Ireland or Sudbury, but you will get interference. For Ofcom's 800MHz clearance consultation, Arqiva provided a plan of how to handle it, which details potential interactions between Mendip and Rouen and Cap de la Hague, should it be allocated C48 and C51 to replace C61 and C62.

However, I suspect this is in the 1% case (e.g. ducting), not general problems with reception.

John_Ha: I'd start by checking that cables are still making good contact and that the aerial is intact. Cable insulation does deteriorate with exposure to UV light and water penetration becomes a possibility - higher frequencies are affected worse by water problems than lower ones.

Amplification can also cause a problem - digital TV requires very linear response, it can't handle any significant distortion. If you have an amplifier or booster, try removing it or turning it down. Amplifier power supplies can introduce ripple if they start to fail, and ripple in the PSU causes ripple on the output, which again causes periods of drop-out or distortion.

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Mike Dimmick's 2,486 posts GB flag
11:27 PM

The information for Mendip transmitter shows 3 mux's on VERY LOW output. When if ever, will these be of comparable power to the others? My signal is ok now (other than sometimes freezing or missing a few words ocasionaly) but with digital so far it seems a little bit of "different" weather will soon put paid to the "ok" signal.
Thank you.

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Mike's 3 posts GB flag
Wednesday, 3 August 2011

8:43 AM

Mike: As it says above:

"Mendip SDN and Arqiva A will temporarily operate on channels 62+ and 56+ respectively (both at 10kW ERP) until September 2011. Final DSO channels will then be adopted, though ERP levels will remain limited until early 2012. Arqiva B will operate on channel 59+ (10kW ERP) until January 2011, when it will move to channel 67 at 26kW ERP until September 2011. Arqiva B's final DSO channel will then be adopted, though ERP will remain limited until early 2012. NOTE: ArqA increases from 10kW to 12.5kW on 28 September (changes to 64QAM mode and loses its current +167kHz offset.)"

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Briantist's 38,899 posts GB flag
Friday, 5 August 2011
12:01 AM

I've been struggling with Mendip a lot since the last changes were made, Mux A, C and ARQ B are all breaking up, especially C which is completely unwatchable, no amount of antenna alignment seems to work.

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Mikei's 1 post GB flag
2:09 PM

Brian could you elaborate on LCNs 110 to 112 please, are they for internet TV or what?

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Bizman's 20 posts GB flag
Saturday, 6 August 2011

8:07 PM

Bizman: They seem to be place-holders for an IPTV service - see VISION TV network .

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Briantist's 38,899 posts GB flag
Monday, 8 August 2011

7:18 AM

Mikei: You have not provided a postcode, so this is general information.

As it says above "Mendip SDN and Arqiva A will temporarily operate on channels 62+ and 56+ respectively (both at 10kW ERP) until September 2011. Final DSO channels will then be adopted, though ERP levels will remain limited until early 2012. Arqiva B will operate on channel 59+ (10kW ERP) until January 2011, when it will move to channel 67 at 26kW ERP until September 2011. Arqiva B's final DSO channel will then be adopted, though ERP will remain limited until early 2012."

Which basically means you will have to wait for the full power services to start.

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Briantist's 38,899 posts GB flag
Tuesday, 9 August 2011

11:39 PM

Aaargh I'm getting Welsh news - I'm in Swindon.

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Me's 65 posts GB flag
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