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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.

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
C32 (562.0MHz)591mDTG-3100,000W
Channel icons
1 BBC One (SD) West, 2 BBC Two England, 9 BBC Four, 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, 25 ITV4, 29 E4 +1, 34 ITV +1 (West),

PSB3
BBCB
 H max
C35 (586.0MHz)591mDTG-6100,000W
Channel icons
72 Shopping Quarter , 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, 204 CBBC HD, plus 1 others

COM4
SDN
 H max
C48 (690.0MHz)591mDTG-8100,000W
Channel icons
 CCXTV, 12 Quest, 20 Drama, 21 5USA, 28 ITV2 +1, 31 5STAR, 32 Paramount Network, 41 GREAT! movies action, 45 Channel 5 +1, 55 5SELECT, 57 ITVBe +1, 58 ITV3 +1, 59 ITV4 +1, 63 Blaze, 66 CBS Reality, 68 Horror Channel, 73 Drama +1, 77 TCC, 80 Blaze +1, 203 CITV, 211 Ketchup TV, 212 YAAAS!, plus 15 others

COM5
ArqA
 H max
C33 (570.0MHz)591mDTG-8100,000W
Channel icons
11 Sky Arts, 17 Really, 19 Dave, 30 4Music, 35 pick, 39 Quest Red, 42 Food Network, 46 Film4 +1, 47 Challenge, 48 4seven, 56 Smithsonian Channel, 69 Quest +1, 74 Yesterday +1, 82 Together TV, 233 Sky News, plus 9 others

COM6
ArqB
 H max
C36 (594.0MHz)591mDTG-8100,000W
Channel icons
23 Dave ja vu, 26 Yesterday, 33 GREAT! movies, 38 DMAX, 40 CBS Justice, 43 HGTV, 67 CBS Drama, 81 Talking Pictures TV, 84 PBS America, 234 RT, 235 Aljazeera English, plus 18 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
 Together TV +1,  Merit, 64 FreeSports, 70 Quest Red +1, 76 Now 70s, 86 More4 +1, 87 PBS America +1, 89 Court TV, 96 Forces TV, 106 BBC Four HD, 107 BBC News HD, 113 RT HD, 114 Quest HD, 205 CBeebies HD, 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 (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 - 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
Saturday, 9 June 2012
L
Lordgeous
sentiment_satisfiedBronze

12:22 PM
Bath

Where have all the comments/questions gone???

link to this comment
Lordgeous's 25 posts GB
L
Lordgeous
sentiment_satisfiedBronze

12:23 PM
Bath

Oooops, sorry - found them!

link to this comment
Lordgeous's 25 posts GB
Sunday, 10 June 2012
Transmitter engineering
sentiment_very_satisfiedOwner

4:29 AM

MENDIP transmitter - Freeview BBC Digital TV Weak Signal from 03:50 on 08 Jun to 04:18 on 08 Jun HD Digital TV Weak Signal from 03:50 on 08 Jun to 04:39 on 08 Jun [BBC]

link to this comment
Transmitter engineering's 137,581 posts xx
Transmitter engineering
sentiment_very_satisfiedOwner

4:29 AM

MENDIP transmitter - Freeview BBC Digital TV Weak Signal from 03:50 on 08 Jun to 04:18 on 08 Jun HD Digital TV Weak Signal from 03:50 on 08 Jun to 04:39 on 08 Jun [BBC]

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Transmitter engineering's 137,581 posts xx
Monday, 11 June 2012
M
Mike
sentiment_satisfiedBronze

4:23 PM
Poole

Dave Lindsay Re Sony pvr seems too much signal was too much have changed aerial connections on distribution amp to mast amp reduced signal to 75% quality 100% on all Mendip channels not had any more problems with unwanted Rowridge channels.Thanks for your advice

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Mike's 29 posts GB
Tuesday, 12 June 2012
B
Ben Ward
sentiment_satisfiedBronze

10:35 PM
Melksham

Ben Ward: jb38 thank you very much for your advice and suggestions. I have done the tasks you suggested I do, as follows:

i. Ch61 on the Humax shows quality and strength both being 100%

ii. On the Panasonic, manually tuning it to Ch61 in the way that you said does result in some signal, as opposed to nothing. Nonetheless, I proceeded with the 2 bottom paras of your posting instructions. Having inserted my attenuator, I turned the knob as slowly as I could but to be honest it was very hard to tell if my twiddling was having any effect at all - quality varies from 0-20% at best; strength varies from 85-100% and both display bars flick around arbitrarily so its hard to gauge any effect, as I said.

Anyway, that's what I found. All our Freeview signals worked fine up until April, as I am sure I've previously mentioned.

Regards,
Ben Ward

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Ben Ward's 28 posts GB
Thursday, 14 June 2012
L
Lordgeous
sentiment_satisfiedBronze

2:26 PM
Bath

My problems seem similar to Ben Wards, as said previously, all channels working fine til about same time (April) - coincidence?. Was going to reply in detail to RG38s appreciated post but as of couple of days ago all seems to be working fine again, except occasional bad picture on borderline channels. Just for the record though my line of sight to Mendip is slightly more southerly than he imagines from postcode location. I know houses & hill with trees behind that he mentions which are off to the right. From my rooftop there are absolutely no obstructions with clear line of sight to the opposite side of the valley that Bath sits in. Anyway, fingers crossed for now. Thought digital was going to be trouble free but in 40 plus years of analogue never had ANY problems, except occasional transmitter breakdown!

link to this comment
Lordgeous's 25 posts GB
J
jb38
sentiment_very_satisfiedPlatinum

6:18 PM

Ben Ward: I realise that this has been brought up before, but the test that you carried out on the Humax whereby it was indicating 100% on strength & quality "still" indicates that you are receiving a slightly over the top signal, but though! I would like you to check something by going into the Humax's installation menu / antenna power and confirm that the antenna power selector is set to off.

The reason for me wanting this confirmed is, that if you witness that reading and yet when you transfer the aerial over to the Panasonic TV-L19C20B and there is virtually no signal, then it can only be caused by either (1) the signal being too strong for the sets tuner resulting in RF blocking or (2) that the sets tuner is not compatible with technical aspects of the signal, or and the reason for the check requested, (3) that your aerial system has a preamp that's being powered by the Humax, and if an aerial amp is unpowered whilst its still in circuit it acts like an attenuator, something which would obviously be the case if the aerial lead was plugged into anything except the Humax.
This probably wont be the case but I would just like it confirmed.

Regarding the Panasonic, as I am not exactly acquaint with that particular model I decided to check out Panasonic's "non-compatible" lists but didn't find it mentioned anywhere.

Regarding that attenuator, these are basically slightly crude devices that work OK unless in a really strong signal area, as in these areas the only variation that's likely to be noticed is a minute segment at one end of the scale, fixed attenuators being far more accurate albeit its hit and miss for a person to get it right first time, as you generally require to have about three of them trying various permutations with different values by placing some in series with each other to increase the level of attenuation.

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jb38's 7,179 posts GB
L
Lordgeous
sentiment_satisfiedBronze

7:11 PM
Bath

Sorry, I meant JB38, not RG38!

link to this comment
Lordgeous's 25 posts GB
J
jb38
sentiment_very_satisfiedPlatinum

9:17 PM

Lordgeous: That perfectly OK! as I realised it was me you were referring to. I also noted what you had mentioned to Ben Ward regarding your location insomuch that it wasn't quite what the post code would suggest, and indeed I feel that very few ever are when allocated in built up areas and why I had initially qualified my comment by "if its truly representative" etc.

The curse with digital reception is that its success is based on receiving a signal that stays between two levels, that of always being above a level of low but not at any time exceed a certain point of high, as should at any time these two points be violated then the signal will start to break up or cut off altogether, whereas analogue was far more tolerant and with a person having instant visual feedback if their signal was varying, as indeed all signals do in most non line of sight situations, with grain / speckles starting to show on the picture if the signal level was dropping, the density level of these increasing the more the signal level was decreasing, whereas if the signal strength was verging on the excessively high then this resulted in masses of fine herring bone patterns being superimposed on the screen as well as in many cases thick wavy lines also being seen, these usually accompanied with a ripple or rasping noise being heard on the audio.

The only form of digital reception with a virtually guaranteed glitch free performance is via satellite, as nothing affects that with the exception of a really heavy thundery downpour, and even then its only few a few minutes at the very most with under a minute being more the norm.





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