Mendip (Somerset, England) DAB transmitter
 | Google map |  | Bing map |  | Google Earth |  | 51.237,-2.626 or 51°14'12"N 2°37'33"W |
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 07/07/2025 Pixelation or flickering on some or all channels 
UK Free TV shows the coverage area for a radio transmitter as a coloured overlay (orange for FM, other colours for DAB) on the grey map. We have computed the coverage by combining the terrain with the official radiation pattern. A single click will select the transmitter to view the coverage for a single site, and a double click goes to a page showing full details. Click on the buttons in the right-hand corner of the map to choose from different frequencies (or multiplexes for DAB).
Local transmitter maps
Mendip Freeview Mendip DAB Mendip AM/FM Mendip TV region BBC West WestFriday, 20 June 2025
C
Chris.SE7:47 PM
Paul Morrish:
Whilst you've posted on the DAB transmitter page rather than the Freeview one, no worries, the warning about Planned Engineering also appears at the top of this page.
I assume you've seen this moderately simplistic explanation of how/why this sort of problem exists and occurs occasionally -
High pressure may affect TV & Radio services across parts of the UK from 8 July 2025 | Help receiving TV and radio
The reason that you are currently finding the BBC (SD?) channels affected more than any others is at least two fold at this time.
The BBC SD channels are transmitted on one multiplex, ITV, Ch4, Ch5 and their sister channels are transmitted on another, these are on different UHF channels, as are a number of the other "commercial channels" on other multiplexes (groups of TV programme channels).
1) The propagation issues are somewhat frequency dependant, the current state of the atmosphere determining how particular frequencies are affected
2) Depending on where the particular current interference is coming from (it won't necessarily be the same each time) not all UHF channels will be the same as Mendip, so not all multiplexes might be affected.
3) The BBC SD multiplex (last time I checked) was on reduced power or on the Reserve antenna (lower on the mast) so your wanted received signal strength will be lower, so interfering signals will be relatively greater.
4) You may have better reception at present watching the HD version of the channels - ITV, CH.4 and Ch5 are also on the same BBCB HD multiplex.
5) IIRC some parts of Thornbury don't get the best of reception from Mendip, but as you haven't given a full postcode I can't advise further on that.
| link to this comment |
Select more comments
Your comment please!