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Full Freeview on the Mendip (Somerset, England) transmitter

Brian Butterworth first published this on 1st May 2004 at 08:20 - UK Free TV

51.237,-2.626 or 51°14'12"N 2°37'33"W

BA5 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 18/09/2023 Pixelation or flickering on some or all channels

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.

Mux	H/V	Frequency	Height	Mode	Watts
PSB1 BBCA	H max	C32 (562.0MHz)	591m	DTG-	100,000W
	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)	591m	DTG-	100,000W
	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),
PSB3 BBCB	H max	C35 (586.0MHz)	591m	DTG-	100,000W
	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, 109 BBC Three HD, 204 CBBC HD, 205 CBeebies HD, plus 1 others 66 TBN UK,
COM4 SDN	H max	C48 (690.0MHz)	591m	DTG-8	100,000W
	20 Drama, 21 5USA, 29 ITV2 +1, 32 5STAR, 33 5Action, 38 Channel 5 +1, 41 Legend, 42 Great! Movies Action, 57 Dave ja vu, 58 ITVBe +1, 59 ITV3 +1, 64 Blaze, 67 CBS Reality, 69 HorrorXtra, 78 TCC, 81 Blaze +1, 89 ITV4 +1, 91 WildEarth, 203 CITV, 208 Pop Player, 209 Ketchup TV, 210 Ketchup Too, 211 YAAAS!, plus 16 others
COM5 ArqA	H max	C33 (570.0MHz)	591m	DTG-8	100,000W
	Smithsonian Channel, 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, 60 Drama +1, 70 Quest +1, 71 That's 60s, 74 Yesterday +1, 75 That's 70s, 233 Sky News, plus 9 others
COM6 ArqB	H max	C36 (594.0MHz)	591m	DTG-8	100,000W
	Quest Red +1, Classic Hits, 12 Quest, 25 W, 27 Yesterday, 34 GREAT! movies, 39 DMAX, 44 HGTV, 52 GREAT! romance, 73 HobbyMaker, 76 That's 80s, 82 Talking Pictures TV, 83 Together TV, 84 PBS America, 90 Together TV +1, 235 Al Jazeera Eng, plus 19 others
LBS	H -10dB	C30 (546.0MHz)	591m	DTG-12	10,000W
	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?

BBC Points West 0.9m homes 3.4%
from Bristol BS8 2LR, 25km north (3°)
to BBC West region - 60 masts.

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?

Cheddar	Transposer	15 km E Weston-super-Mare	1674 homes
Luccombe	Active deflector	6 km w Minehead	38 homes

How will the Mendip (Somerset, England) transmission frequencies change over time?

	1984-97	1997-98	1998-2010	2010-13	2013-18	2013-17	27 Feb 2018
	C/D E	E	E	C/D E	C/D E T	W T	W T
C30							_local
C32							BBCA
C33						com7	com7
C34							D3+4
C35						com8	com8
C36							ArqB
C37		C5_waves	C5_waves
C48				SDN	SDN	SDN	SDN
C49_{tv_off}					BBCA	BBCA
C51_{tv_off}						LBS	LBS
C52_{tv_off}				ArqB	ArqB	ArqB
C54_{tv_off}	C4_waves	C4_waves	C4_waves	D3+4	D3+4	D3+4
C55_{tv_off}							com7_{tv_off}
C56_{tv_off}				ArqA	ArqA	ArqA	COM8_{tv_off}
C58_{tv_off}	BBC1_waves	BBC1_waves	BBC1_waves	BBCB	BBCB	BBCB
C61	ITV_waves	ITV_waves	ITV_waves	BBCA
C64	BBC2_waves	BBC2_waves	BBC2_waves

_{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

Local transmitter maps

Mendip Freeview Mendip DAB Mendip AM/FM Mendip TV region BBC West West

Which companies have run the Channel 3 services in the Mendip transmitter area

Jan 1958-Jul 1968	Television Wales and the West
Jul 1968-Feb 2004	Harlech Television
Feb 2004-Dec 2014	ITV plc

Feb 1983-Dec 1992	TV-am•
Jan 1993-Sep 2010	GMTV•
Sep 2010-Dec 2014	ITV 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.

Is the transmitter output the same in all directions?

Comments

Monday, 11 September 2023

Transmitter engineering

_{sentiment_very_satisfied}Owner

5:09 AM

- Mendip transmitter: Possible effect on TV week commencing 11/09/2023 Pixelation or flickering on some or all [DUK]

link to this comment

Transmitter engineering's 143,924 posts GB flag

Monday, 18 September 2023

Transmitter engineering

_{sentiment_very_satisfied}Owner

5:09 AM

- Mendip transmitter: Possible effect on TV week commencing 18/09/2023 Pixelation or flickering on some or all [DUK]

link to this comment

Transmitter engineering's 143,924 posts GB flag

Friday, 22 September 2023

The_Highwayman
6:01 PM

Has HorrorXtra channel and realityXtra channel swapped Mux ?

is . I am in Bristol.

All started Tuesday Night / Wednesday Morning 19th/20th September 2023. In my case EPG swapped between 'RealityXtra' and 'HorrorXtra', but this was corrected a day later.

No 'you may need to retune your equipment - press Yellow to dismiss this message' pop-up, like previously displayed for such changes.

No warnings of re-tune / re-mapping on the usual web sites, though hints of works and reduced (that were NOT evident) on some sites including this one, week beginning 18th September 2023.

I setup a recording that recorded the other unwanted channel in the pair, presumably due to the EPG swap / error.

It seems to me that the HorrorXtra channel has been relegated to the Local Mux, for Mendip and realityXtra has been elevated to COM4 / SDN, for Mendip. The change was half-completed, or an error on EPG introduced, the first night with full completion the second.

The local MUX C30 is 10,000W and COM4 / SDN C48 is 100,000W for Mendip - so if you cant get the Local channel, "Bristol TV", you'll likely lose HorrorXtra.

Many re-tunes, Factory Resets and swapping the input lead primary / slave looping between my TWO receivers didn't fix the issues, except I am lucky and one and only one of my receivers is sensitive enough to receive the Local Mux.

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The_Highwayman's 1 post GB flag

Saturday, 23 September 2023

Chris.SE

_{sentiment_very_satisfied}Platinum

2:23 AM

The_Highwayman:

RealityXtra LCN68 is now on SDN/COM4, HorrorXtra LCN69 is now on the Local .
This was a change made by the broadcaster and even Freeview didn't mention it amongst the other minor channel changes this month. (They never give details of the multiplex in their "" in any event, they just talk about "increased coverage" or "decreased coverage" !!

Apparently, although the channels swapped multiplexes, the broadcaster forgot to swap the EPG immediately so had the listings for the sister channel.
They appear to be correct now.

You must be in a poor location to not get the Local mux (you haven't given a full postcode so I can't advise on that). Because of the transmission used by the Local multiplex it will propagate almost as well as the main signals using less .

It looks as though the Planned is likely to continue next week.

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Chris.SE's 3,680 posts GB flag

Chris.SE

_{sentiment_very_satisfied}Platinum

2:31 AM

The_Highwayman:

As far as receiving the Local mux is concerned, it's not a case of sensitivity of the , I should have added that the Local mux is beamed roughly north-north-easterly from , not a very wide beam, see the Red plot on the polar diagram towards the top of the page. So if you off to the East or the you may not get a .

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Chris.SE's 3,680 posts GB flag

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