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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 19/09/2022 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-3100,000W
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

PSB2
D3+4
 H max
C34 (578.0MHz)591mDTG-3100,000W
Channel icons
3 ITV (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, 30 E4 +1, 35 ITV +1 (West),

PSB3
BBCB
 H max
C35 (586.0MHz)591mDTG-6100,000W
Channel icons
56 5SELECT, 101 BBC One HD (England no regional news), 102 BBC Two HD (England), 103 ITV 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

COM4
SDN
 H max
C48 (690.0MHz)591mDTG-8100,000W
Channel icons
12 Quest, 20 Drama, 21 5USA, 29 ITV2 +1, 32 5STAR, 33 5Action, 41 Legend, 42 GREAT! movies action, 46 Channel 5 +1, 58 ITVBe +1, 59 ITV3 +1, 64 Blaze, 67 CBS Reality, 74 Dave ja vu, 78 TCC, 81 Blaze +1, 89 ITV4 +1, 203 CITV, 208 POP MAX, 209 Ketchup TV, 210 Ketchup Too, 211 YAAAS!, plus 15 others

COM5
ArqA
 H max
C33 (570.0MHz)591mDTG-8100,000W
Channel icons
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, 57 Smithsonian Channel, 60 Drama +1, 70 Quest +1, 75 Yesterday +1, 83 Together TV, 233 Sky News, plus 8 others

COM6
ArqB
 H max
C36 (594.0MHz)591mDTG-8100,000W
Channel icons
 FreeSports, 25 W, 27 Yesterday, 34 GREAT! movies, 39 DMAX, 44 HGTV, 71 Quest Red +1, 73 HobbyMaker, 82 Talking Pictures TV, 84 PBS America, 88 Classic Hits, 235 Aljazeera English, plus 19 others

LBS
 H -10dB
C51 (714.0MHz)591mDTG-1210,000W
Channel icons
from 22nd September 2014: 7 Made in Bristol,

com7
 H -1.4dB
C55 (746.0MHz)591mDTG-672,400W
Channel icons


DTG-3 64QAM 8K 2/3 24.1Mb/s DVB-T MPEG2
DTG-6 256QAM 32KE 2/3 40.2Mb/s DVB-T2 MPEG4
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, 2 February 2017
M
MikeB
sentiment_very_satisfiedPlatinum

9:28 AM

Col: Look at the links your postcode has brought up - there is an obstruction about a km from you, but other than that, your 35km with a clear signal path, and Digital UK reckons you should be fine.

You havn't said what the signal STRENGTH is - very high or very low? If it was always low because of the obstruction, then a booster isn't going to help that much - personlly, I'd just go Freesat. But if your signal is actually fine, then the booster might be causing more problems than its solving. If your all using boosters, and your all having the same problem, then it might the fact that your all using boosters that IS the problem. And if the booster etc isn't working properly, then that would kill your signal.

Yes, your neighbours are having problems, but are they the same problems? If they are, then could it be a high pressure system? But that would lead to a lot of people losing signal. The transmitter seems fine, so its not that. You might have a problem with your system, but it might be a different problem from the others.

Check your signal strength, and the same goes for the others. If its very high, try taking the booster out of the circuit - and then see what strength/quality is like. In the meantime, search for 'too much of a good thing' on this site.

link to this comment
MikeB's 2,579 posts GB
MikeP
sentiment_very_satisfiedPlatinum

6:21 PM

Col:

As I use Mendip as my primary source I know there are no transmitter problems that would cause the symptoms you state. Follow the advice given by MikeB.



link to this comment
MikeP's 3,056 posts GB
Thursday, 9 February 2017
C
Chris.SE
sentiment_very_satisfiedPlatinum

7:23 AM

Col: & others
I also use Mendip as my primary signal source and can also confirm that there are no transmitter problems - which in any event would be reported here if there had been any.

As has been said many times in the past, weather patterns can have significant effects on signal propagation, and that is not just whether it's raining or there is a high pressure system (although the latter frequently can have an effect) it is far more complicated than that. So if you have a "marginal" signal - which can be either because the signal is weak OR too strong, then changes in propagation can result in changes in signal strength and/or changes in co-channel interference which can result in intermittent loss of the wanted signal. It's also possible for mobile phone signals to cause problems especially if aerial amplifiers are in use.
The result of this with digital signals can be pixelation, intermittent sound and/or (intermittent) complete loss of signal.

Col: As you say "yet again", follow MikeB & MikeP's advice - there is no point in me repeating it.
You mention you all have to use boosters otherwise you don't receive anything BUT was that based on a need prior to full digital switchover in April 2010?

Where is the "amplifier" located? is it at the aerial or indoors somewhere?

Look at the Tuning section of your TV's programming and look at the strength and/or quality of the various signals with and without the amplifier. You mention dropping to 1 or 2 but don't say what it "normally" is, or what the scale on your particular TV is, the maximum may be 5 or 9 or 10 etc.

Also check that your are in fact correctly tuned to the Mendip UHF Channel Muxes (and not any of the Wenvoe ones).

Lastly, there is a Mobile Phone mast located quite close to you just off the line-of-sight, so when you have checked all the previous suggestions have a visit to at800 | 4G & Freeview | 4G interference | 4G Filters | 800 MHz , you might (note I said might) need a filter.


link to this comment
Chris.SE's 3,089 posts GB
Sunday, 19 February 2017
Transmitter engineering
sentiment_very_satisfiedOwner

4:32 AM

MENDIP transmitter - DAB: BBC National DAB Radio Weak Signal from 02:38 today to 02:46 today. [BBC]

link to this comment
Transmitter engineering's 138,029 posts xx
Monday, 20 February 2017
Transmitter engineering
sentiment_very_satisfiedOwner

4:31 AM

MENDIP transmitter - DAB: BBC National DAB Radio Weak Signal from 02:38 yesterday to 02:46 yesterday. [BBC]

link to this comment
Transmitter engineering's 138,029 posts xx
J
James Edmund
7:53 PM

Hi there,

I've lost all the HD channels since Sunday about 5pm

I am in Corsham in Wiltshire so expect the mendit transmission tower to be relevant.

Please let me know if there is anything causing this.

link to this comment
James Edmund's 1 post GB
Tuesday, 21 February 2017
Transmitter engineering
sentiment_very_satisfiedOwner

4:31 AM

MENDIP transmitter - DAB: BBC National DAB Radio Weak Signal from 02:38 on 19 Feb to 02:46 on 19 Feb. [BBC]

link to this comment
Transmitter engineering's 138,029 posts xx
MikeP
sentiment_very_satisfiedPlatinum

8:28 PM

James Edmund:

The onl;y work listed for Mendip is related to the DAB services only. So you may have a poor connection in the cables between the aerial and your equipment.



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MikeP's 3,056 posts GB
Friday, 24 March 2017
I
Iain Davies
7:22 AM

I take it that after the big channel change in 2019 that all the tx channels will be HD to carry all the programmes we have now on the 9 tx channels we have.

link to this comment
Iain Davies's 11 posts GB
Transmitter engineering
sentiment_very_satisfiedOwner

1:33 PM

MENDIP transmitter - DAB: BBC National DAB Radio Weak Signal from 11:07 today to 11:25 today. [BBC]

link to this comment
Transmitter engineering's 138,029 posts xx
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