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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.

This transmitter has no current reported problems

The BBC and Digital UK report there are no faults or engineering work on the Mendip (Somerset, England) transmitter.

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
Wednesday, 30 March 2016
MikeP
sentiment_very_satisfiedPlatinum

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.


link to this comment
MikeP's 3,056 posts GB flag
Tuesday, 19 April 2016
D
Dr J Harvey
12:39 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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Dr J Harvey's 1 post GB flag
Friday, 22 April 2016
F
fade2gray
12:44 PM

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?

link to this comment
fade2gray's 4 posts GB flag
J
jb38
sentiment_very_satisfiedPlatinum

7:06 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.


link to this comment
jb38's 7,179 posts GB flag
C
Charles Stuart
sentiment_satisfiedSilver

10:07 PM

@ 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.

link to this comment
Charles Stuart's 159 posts GB flag
Charles's: mapC's Freeview map terrainC's terrain plot wavesC's frequency data C's Freeview Detailed Coverage
Thursday, 28 April 2016
N
nicholas
sentiment_satisfiedSilver

9:28 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

link to this comment
nicholas's 120 posts GB flag
N
nicholas
sentiment_satisfiedSilver

9:35 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.

link to this comment
nicholas's 120 posts GB flag
N
nicholas
sentiment_satisfiedSilver

9:43 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.

link to this comment
nicholas's 120 posts GB flag
Saturday, 14 May 2016
T
Tim
11:26 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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Tim's 1 post US flag
Sunday, 15 May 2016
MikeP
sentiment_very_satisfiedPlatinum

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.



link to this comment
MikeP's 3,056 posts GB flag
MikeP's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
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Your comment please
Please post a question, answer or commentIf you have Freeview reception problems before posting a question your must first do this Freeview reset procedure then see: Freeview reception has changed, Single frequency interference, and Freeview intermittent interference.

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If you have other problems, please provide a full (not partial) postcode (or preferably enter it in box at the top right) and indicate where if aerial is on the roof, in the loft or elsewhere.

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