Full Freeview on the Mendip (Somerset, England) transmitter
Brian Butterworth first published this on - UK Free TV
Google Streetview | Google map | Bing map | Google Earth | 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.
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Digital television services are broadcast on a multiplexes (or Mux) where many stations occupy a single broadcast frequency, as shown below.
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 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.
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?
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 | C5waves | C5waves | |||||||
C48 | SDN | SDN | SDN | SDN | |||||
C49tv_off | BBCA | BBCA | |||||||
C51tv_off | LBS | LBS | |||||||
C52tv_off | ArqB | ArqB | ArqB | ||||||
C54tv_off | C4waves | C4waves | C4waves | D3+4 | D3+4 | D3+4 | |||
C55tv_off | com7tv_off | ||||||||
C56tv_off | ArqA | ArqA | ArqA | COM8tv_off | |||||
C58tv_off | BBC1waves | BBC1waves | BBC1waves | BBCB | BBCB | BBCB | |||
C61 | ITVwaves | ITVwaves | ITVwaves | BBCA | |||||
C64 | BBC2waves | BBC2waves | BBC2waves |
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
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Monday, 20 November 2023
S
Sim B8:14 PM
Looking for some advice - recently very high error rate on the D3+4 PSB2 and all channels now pixelated. PSB1 working totally fine on all channels. Signal strength on PSB1 and PSB 2 similar could this be local interference from something not there previously - in in GL19 4 so a reasonable distance away from Mendip
Any thoughts or advice gratefully received
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C
Chris.SE10:10 PM
Sim B:
It could be anything to be quite frank. As mentioned in the previous post, and umpteen times around this site, reception predictors don't work on partial postcodes. GL19 4 is a very large area with extremely variable terrain. Reception may vary from zero to quite good despite the distance.
Also we can't check if you may be susceptible to interference from a new/upgraded phone mast using 700MHz (5G/4G+). It could be you should have had a postcard from RestoreTV but haven't (we've encountered a number of such cases).
Check you are correctly tuned to Mendip's UHF channels as listed in the section at the very top of this page.
Please give the signal strength and Error figures for each UHF multiplex as well as your full postcode.
Do check some obvious things such as is your aerial looking intact and still pointing as it was, is the coax secure and not flapping in the wind? Check all accessible coax connections and ensure there's no corrosion or water. Sometimes these sort of problems can affect one multiplex without an observable effect on the others.
Do you have any amp and/or splitter maybe to feed more than one set?
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Sunday, 26 November 2023
B
Bristol_Rich9:31 AM
Grateful for some pointers...
I've a loft mounted aerial, tuned into Mendip - no historical issues.
Watching tv Friday night no problems, yet Saturday morning I can only receive BBC channels, all others are 100% strength 0% quality - Chanel idents and EPG available - broken sound no image.
Have checked aerial for damage and no obvious signs of damage, post code checker reports no problems.
Thoughts?
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C
Chris.SE3:22 PM
Bristol_Rich:
I wouldn't rely on the postcode checker for problems I'm afraid, it's not always accurate.
Without your full postcode to look at your predicted reception, it's not possible to give any specific suggestions.
You mention 100% signal strength, do you have an amp or amp/splitter. If so, and it has variable gain, turn it down a touch so that the strength drops to just below 100%. Too much signal can be as bad a s a very weak signal with similar results.
There was a little bit of Tropospheric Ducting around yesterday morning, but that should have cleared by now.
Have a read of my previous half dozen posts on the Mendip transmitter page, any of the main content of which could be applicable, but pay particular attention to NOT retuning when you have no signal/badly pixellated pictures/broken sound, if you were correctly tuned initially.
Also to the possibility of mobile mast interference.
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B
Bristol_Rich5:01 PM
Chris.SE:
Hi Chris, thank you...Fortunately I had read one of your previous links about not retuning
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B
Bristol_Rich5:02 PM
Hi Chris, thank you...Fortunately I had read one of your previous links about not retuning...
I've just ordered a variable attenuator to see if that helps dial the signal strength down a bit. However, after numerous hours of faffing, leaving it, a quick check about an hour ago reveals that all is back to normal - all channels have returned so assume a transmitter issue or consequence tropospheric ducting...
Either way, it's working - thanks for taking the time to reply.
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B
Bristol_Rich5:03 PM
Hi Chris, thank you...Fortunately I had read one of your previous links about not retuning
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Monday, 27 November 2023
C
Chris.SE12:04 AM
Bristol_Rich:
Glad it's returned to normal. Sensible idea getting a variable attenuator, you can then check/ensure you don't have any overload issues.
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Transmitter engineering
10:47 AM
10:47 AM
Mendip transmitter - Mendip transmitter: Possible effect on TV reception week commencing 27/11/2023 Pixelation or flickering on some or all channels [DUK]
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Monday, 4 December 2023
Transmitter engineering
5:11 AM
5:11 AM
Mendip transmitter - Mendip transmitter: Possible effect on TV reception week commencing 04/12/2023 Pixelation or flickering on some or all channels [DUK]
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