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Full Freeview on the Mendip (Somerset, England) transmitter

first published this on - UK Free TV
sa_streetviewGoogle Streetviewsa_gmapsGoogle mapsa_bingBing mapsa_gearthGoogle Earthsa_gps51.237,-2.626 or 51°14'12"N 2°37'33"Wsa_postcodeBA5 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 Digital tick


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

MuxH/VFrequencyHeightModeWatts
PSB1
BBCA
 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, plus 17 others

PSB2
D3+4
 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), 71 That’s 60s,

PSB3
BBCB
 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, 107 BBC Three HD, 204 CBBC HD, 205 CBeebies HD, plus 1 others

COM4
SDN
 H max
C48 (690.0MHz)591mDTG-8100,000W
Channel icons
20 U&Drama, 21 5USA, 29 ITV2 +1, 32 5STAR, 33 5Action, 38 Channel 5 +1, 41 Legend, 42 GREAT! action, 57 U&Dave ja vu, 58 ITV3 +1, 59 ITV4 +1, 64 Blaze, 67 TRUE CRIME, 68 TRUE CRIME XTRA, 81 Blaze +1, 83 Together TV, 91 WildEarth, 93 ITVBe +1, 209 Ketchup TV, 210 Ketchup Too, 211 YAAAS!, 251 Al Jazeera English, 255 FRANCE 24 (in English), 265 Rok Sky +1, plus 29 others

COM5
ArqA
 H max
C33 (570.0MHz)591mDTG-8100,000W
Channel icons
11 Sky Mix, 17 Really, 19 U&Dave, 31 E4 Extra, 36 Sky Arts, 40 Quest Red, 43 Food Network, 47 Film4 +1, 48 Challenge, 49 4seven, 60 U&Drama +1, 65 That's TV 2, 70 Quest +1, 74 &UYesterday +1, 76 That's TV 2 MCR, 233 Sky News, plus 13 others

COM6
ArqB
 H max
C36 (594.0MHz)591mDTG-8100,000W
Channel icons
12 Quest, 25 U&W, 27 U&Yesterday, 34 GREAT! movies, 39 DMAX, 44 HGTV, 52 GREAT! christmas, 56 That's TV (UK), 63 GREAT! romance mix, 73 HobbyMaker, 75 That's 90s, 82 Talking Pictures TV, 84 PBS America, 235 Al Jazeera Eng, plus 18 others

LBS
 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
C/D EEEC/D EC/D E TW TW T
C30_local
C32BBCA
C33com7com7
C34D3+4
C35com8com8
C36ArqB
C37C5wavesC5waves
C48SDNSDNSDNSDN
C49tv_off BBCABBCA
C51tv_offLBSLBS
C52tv_offArqBArqBArqB
C54tv_offC4wavesC4wavesC4wavesD3+4D3+4D3+4
C55tv_offcom7tv_off
C56tv_offArqAArqAArqACOM8tv_off
C58tv_offBBC1wavesBBC1wavesBBC1wavesBBCBBBCBBBCB
C61ITVwavesITVwavesITVwavesBBCA
C64BBC2wavesBBC2wavesBBC2waves

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.

Comments
Thursday, 17 June 2021
B
bruce james tearle
sentiment_satisfiedBronze

12:44 PM

Hi

Yes, a definite typo!!

Thanks again for info. All seemed good this morning signal wise, just wish theBroadcaster could get their audio sorted!!

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bruce james tearle's 57 posts GB flag
C
Chris.SE
sentiment_very_satisfiedPlatinum

10:49 PM

And the beetroot coloured faces!

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Chris.SE's 4,358 posts GB flag
Saturday, 26 June 2021
K
Kelvin Smith
8:50 AM
Stonehouse

Chris.SE & StevensOnln1: Thanks for your comments regarding quality problems on HD channels on channel 35.

My current set-up is a new wide-band aerial fitted about 2 meters higher than my chimney. The cable goes to the attic where there is an Wolsey LTE WFAV425 powered slitter feeding 3 TV's. It has a variable gain pot and I have tried different settings without any improvement. So did the guy who installed the aerial. At the time channel 35 was so bad the TV's tuned themselves to Wales HD, which was fine (although sometimes had picture breakup), until I re-tuned to get GBNEWS and now they they have gone back to channel 35.

I guess I could re-tune and pull the aerial connector out when it gets to channel 35 and put it back in at channel 36, but that's going to be a bit hit and miss...

All RG6 coax cables are new and of good quality as are the F-connectors.

If I connect my main TV directly to the aerial, I get the following results;
Ch Sig Qty BER
32 30 100 0
33 18 60 0
34 14 50 0
35 no signal
36 10 13 0
37 no signal
48 50 100 0
55 26 100 0

There are no HDMI cables connected on any of the TV's

To me the problem seems more related to weather conditions more than internal interference as sometimes everything works fine. I have turned of my broadband router that is also situated in the attic, just in case... along with everything else I can think of but no improvement...

Turning the aerial to Ridge Hill is an option, but the aerial guy said the signal wasn't any better in that direction. Unfortunately his signal box couldn't measure channel 35! Anyway I prefer HTV West news.

Any other thoughts of what I might try given this additional information??

link to this comment
Kelvin Smith's 5 posts GB flag
Kelvin's: mapK's Freeview map terrainK's terrain plot wavesK's frequency data K's Freeview Detailed Coverage
C
Chris.SE
sentiment_very_satisfiedPlatinum

4:29 PM

Kelvin Smith:

Does your set not have a manual tuning option? If so you can pick the individual channels it tunes to, and I would leave out C37 (unless you are keen to get the Wenvoe local multiplex as you can't get the Local one from Mendip on C30).

Thanks for the figures for the aerial direct to the TV, quite interesting. Not surprisingly you are getting more signal for the higher frequencies as most aerials have more gain at the high end.
This time there's no signal on C35. Considering the figures when the amp/splitter is connected, and comparing it to the other adjacent channels, I say it was likely interference due to Tropospheric ducting.

My guess for the most likely bet is Huntshaw Cross in North Devon it uses C32, C34, & C35 for its COM muxes.
So you might from time to time see issues with PSBs 1 & 2. Don't forget that propagation in such conditions can be very frequency dependant so it won't necessarily affect them all.
Well done for checking possible interference from other sources such as your router.

As for tuning, if you can't manual tune, pulling out the aerial plug at the appropriate time is an option some have used, but as you say it can be hit and miss. Tropo predictions suggest there could be more about in the next few days (even the BBC have a current warning).

Ridge Hill does have a better prediction for you but you'd lose BBC Points West, you can get ITV West on C29 as it has that as well as Midlands on C25.

When conditions are more settled you can see which HD mux, Mendip (C35) or Wenvoe (C47) gives the more stable reception. I doubt there's much more you could do, especially if you can't move the channel LCNs to where you'd want!

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Chris.SE's 4,358 posts GB flag
Sunday, 27 June 2021
K
Kelvin Smith
8:30 PM

Chris.SE: Thanks Chris for your help. I think I'll get the aerial moved to Ridge Hill moved to Ridge Hill and forgo HTV Wetry I'll and see how that works out. Bye bye HTV West...

link to this comment
Kelvin Smith's 5 posts GB flag
K
Kelvin Smith
8:31 PM

Chris.SE: Thanks for your help. Ridge Hill here I come.

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Kelvin Smith's 5 posts GB flag
C
Chris.SE
sentiment_very_satisfiedPlatinum

10:46 PM

Kelvin Smith:

Don't forget they're only predictions. Get your installer to check the actual received strengths with his meter - actually the same goes for Mendip, sometimes a skight tweak of the aerial can make a difference.

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Chris.SE's 4,358 posts GB flag
Thursday, 15 July 2021
R
Roy Lewis
9:09 PM

Mendip transmitter
The LBS station for 'Bristol TV' given above as C51 714MHz seems to be in error and out of date.
Currently available as multiplex C30 546MHz and tuning station 7. Agreed?

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Roy Lewis's 2 posts GB flag
R
Roy Lewis
9:11 PM
Bristol

Mendip transmitter, received at BS48 2UF, aerial in loft.
The LBS station for 'Bristol TV' given above as C51 714MHz seems to be in error and out of date.
Currently available as multiplex C30 546MHz and tuning station 7. Agreed?

link to this comment
Roy Lewis's 2 posts GB flag
Roy's: mapR's Freeview map terrainR's terrain plot wavesR's frequency data R's Freeview Detailed Coverage
C
Chris.SE
sentiment_very_satisfiedPlatinum

10:38 PM

Roy Lewis:

Correct. As has been mentioned several times around this site and now several pages back for Mendip, the site owner has not had time to keep up with the many changes resulting from the 700MHz Clearance programme and this is one of the errors, although the Local mux was recently mentioned just a couple of pages back.

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Chris.SE's 4,358 posts GB flag
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