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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

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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

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
C49 (698.0MHz)591mDTG-3100,000W
Channel icons
 BBC Three, 1 BBC One West, 2 BBC Two England, 9 BBC Four, 120 CBBC, 121 CBeebies, 130 BBC News, 131 BBC Parliament, 601 BBC Red Button 1, plus 13 others

PSB2
D3+4
 H max
C54 (738.0MHz)591mDTG-3100,000W
Channel icons
3 ITV (West), 4 Channel 4 South ads, 5 Channel 5, 6 ITV 2, 13 Channel 4 +1 South ads, 14 More4, 15 Film4, 24 ITV4, 28 E4, 33 ITV +1 (West),

PSB3
BBCB
 H max
C58 (770.0MHz)591mDTG-6100,000W
Channel icons
 BBC Three HD, 45 Film4 +1, 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, 123 CBBC HD, 602 BBC Red Button 2, 603 BBC Red Button 3, plus 1 others

COM4
SDN
 H max
C48 (690.0MHz)591mDTG-8100,000W
Channel icons
10 ITV3, 20 Drama, 21 5USA, 26 ITV Be, 27 ITV 2 +1, 30 5STAR, 34 ITV3 +1, 37 Quest, 44 Channel 5 +1, 55 Channel 5 +24, 58 ITV Be +1, 61 True Entertainment, 62 ITV4 +1, 66 CBS Reality, 70 Horror Channel, 122 CITV, 242 Vintage TV, plus 23 others

COM5
ArqA
 H max
C56 (754.0MHz)591mDTG-8100,000W
Channel icons
11 pick, 12 Dave, 17 Really, 29 E4 +1, 32 Movie Mix, 41 Food Network, 46 Challenge, 48 Movies4Men, 68 truTV, 69 Tru TV +1, 72 YourTV, 126 Tiny Pop, 132 Sky News, plus 18 others

COM6
ArqB
 H max
C52 (722.0MHz)591mDTG-8100,000W
Channel icons
 Al Jazeera English,  BT Sport 1 (not free), 18 4Music, 19 Yesterday, 25 Home, 31 Spike, 38 Quest +1, 42 Travel Channel, 47 4seven, 59 BT Showcase (not free), 64 CBS Action, 73 YourTV +1, 84 Dave ja vu, plus 21 others

LBS
 H -10dB
C51 (714.0MHz)591mDTG-1210,000W
Channel icons
from 22nd September 2014: 7 Made in Bristol, plus 1 others

com7
 H -1.4dB
C33 (570.0MHz)591mDTG-672,400W
Channel icons
 Buz Muzik, 57 VIVA, 63 Community Channel, 67 CBS Reality +1, 71 CBS Drama, 78 5USA +1, 81 Talking Pictures TV, 106 BBC Four HD, 107 BBC News HD, 108 Al Jazeera Eng HD, 109 Channel 4+1 HD, 110 4seven HD, 113 RT HD, 124 CBeebies HD, 134 Al Jazeera Arabic, plus 4 others

com8
 H -7.6dB
C35 (586.0MHz)591mDTG-617,500W
Channel icons
plus 2 others



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
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
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?

years1984-971997-981998-20102010-1327/3/13-2013-182019-
aerial groupC/D EEEC/D EC/D EWK
C22SDN
C25ArqA
C28ArqB
600C33com7
C35com8
C37C5C5
C40BBCB
C43D3+4
C46BBCA
C48SDNSDNSDN
700C49 BBCABBCA
C51LBS
C52ArqBArqBArqB
C54C4C4C4D3+4D3+4D3+4
C55+2
C56+CArqAArqAArqA
C58BBC1BBC1BBC1BBCBBBCBBBCB
C59+1
800C61ITVITVITVBBCA
C62+A
C64BBC2BBC2BBC2
C65+B
C67D

orange background for multiplexes names more
green background for transmission frequencies
lilac background for power levels in watts
800MHz band: 4G mobile started in 2013
700MHz band: possible 4G in 2019 more
600MHz band: new or moved digital TV services more
Notes: + and - denote 166kHz offset; aerial group are shown as A B C/D E K W
Italics for analogue, digital switchover was Wednesdays 24th March and 7th April 2010.

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(-14.6dB) 17.5kW
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, 18 May 2016
MikeP
3:07 PM Trowbridge

David:

One thing you might try, but no quarantees it will resolve the issue, is to add an attenuator *after* your first amplifier. That will reduce the signal level (and that of any 'noise') entering the distribution amplifier. The overall effect should be to reduce the excessive signal level arriving at the receivers. Coaxial attenuators are inexpensive and available in various strengths (typically 3 dB, 6 dB, 12 dB and 18 dB), so try a 6 dB one first. If that is still allowing too much signal (over 80%) then you can add another in series. If it is too much reduction (signal strength drops below 50%) then try a 3 dB type instead. You can combine attenuators of different strengths until you get the required result.

The 'local' transmitter for Bath is a Freeview Lite intended to serve mainly those areas shielded from Mendip by the hills.

Though I am on Mendip and have no problems, there could possibly be some temperature inversion effects perhaps. Do any or your immediate neighbours have the same problem?



link to this
MikeP's 868 posts Gold Gold GB
MikeP's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
T
Tim
11:06 PM

To MikeP, you are right that amplifiers amplify the signal and noise, even with a little more noise added by the amp itself, but when amplifying the signal prior to a lossy link, e.g. a downlink cable or even a mast-to-antenna link like Mendip to Chippenham amplified to 100kW (still with noise beforehand or course), it boosts the signal over the noise of the path so that the ratio at the receiving end is improved. Perhaps it wasn't expressed so clearly but I'm sure that x years of experience will not be lost on this point. So my advice to Dr. Harvey in Chippenham is still to use an amp unless the downlink is short. Too many parts of the town have antennae on such long masts that are testimony to the shadowing of the intervening terrain around Corsham and nearer to be able to have total confidence in not using one. A signal path predictor which also takes the earth's curvature into account can be found here: Terrain - shows radio profile between two UK sites to optimise you DTT, Freeview, DAB or analogue TV reception .

link to this
Tim's 6 posts US
Thursday, 19 May 2016
C
Chris.SE
7:55 AM Salisbury

David: Have you noticed any degradation at all in the signal/quality for the main HD channels (BBC B mux) - BBC, ITV etc? This is on C58 from Mendip.
Sky News etc is on the Arq A (Com5) mux on C56. If you are also seeing some degradation of those HD channels, then I'd start suspecting some issues with damp/water in the aerial connections or the coax which will start affecting the higher frequency channels first.

link to this
Chris.SE's 6 posts GB
Chris.SE's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
D
David
10:23 AM

Thanks Chris, all HD channels have strong signal. MikeP, I have some signal attenuators which I'll try again. Thankyou.

link to this
David's 19 posts GB
T
Tim
5:25 PM

David, there is an outside chance you are seeing co-channel interference from the Huntshaw Cross transmitter, which reuses UHF channels 52 and 56, the ones you are having problems with. The transmitter is more or less behind Mendip from your location though much more distant. You may be able to confirm this by getting your equipment into a portable state and testing it from a location where Huntshaw Cross is not in the frame to see if it behaves the same. Neighbours are likely to be suffering the same issue.

link to this
Tim's 6 posts GB
Friday, 20 May 2016
A
alan swinburne
6:54 AM

This Morning (Friday 20th April) at 6:30 am:
All the PSB2 MUX (ITV) channels have suddenly disappeared from the freeview box and yet there is no planned maintenance from the Mendip transmitter page.
Anyboby else have this problem?

link to this
alan swinburne's 1 post GB
Wednesday, 25 May 2016
D
Dave
3:19 PM

Used to get Dave and Challenge (Freeview 12 and 46) very well until recently. No signal the last few days. Post code TA24 near Williton .
Not a techie, so any ideas please and anyone else experiencing this? Only the last 10 days or less. Before, it was very good.

link to this
Dave's 10 posts GB
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