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Llanrhaeadr ym Mochnant (Shropshire, England) analogue radio transmitter

sa_gmapsGoogle mapsa_bingBing mapsa_gearthGoogle Earthsa_gps52.825,-3.227 or 52°49'31"N 3°13'38"W

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).

This transmitter has no current reported problems

The BBC and Digital UK report there are no faults or engineering work on the Llanrhaeadr ym Mochnant (Shropshire, England) transmitter.

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Llanrhaeadr ym Mochnant analogue radio transmitter
BBC Radio 2  89.8MHz  , BBC Radio 3  92.0MHz  , BBC Radio 4 (FM)  94.2MHz  , BBC Radio 1  99.4MHz  , BBC Radio Cymru  103.8MHz 

What do the map symbols mean?

 FM/AM radio mast.

Other local maps

Llanrhaeadr ym Mochnant Freeview Llanrhaeadr ym Mochnant AM/FM Long Mountain TV region BBC Wales Wales DAB in Shropshire AM/FM in Shropshire

Sunday, 8 February 2015
Peter Johnson
5:06 PM Oswestry

I believe I get my TV signal from the Llanrhaeadr mast (OS grid Ref SJ176260) , I live 4 miles away from it (SY10 0AG) with direct line of sight to the mast. There are the upper branches of two trees maybe 200 metres from my house just slightly blocking an entirely open view of the tower.
Since the transfer to digital the BBC TV service I get has fallen apart, however ITV/Channel 5/S4C are just fine. This morning at 8am I was getting 10 TV channels on 666000kHz (BBC services) and 9 channels on 698000 kHz (ITV). Reception, picture quality, etc, on all channels was fine. By 10:30am all the 666000 kHz channels were of unwatchable quality with freezes every few seconds. By Noon the TV was showing 'No Signal' for all the BBC stations - YET THROUGHOUT THE ITV (698000 kHz) STATIONS WERE PERFECT and remain so 24/7.
Please can somebody tell me why this is? Is the 666 signal strength really low, or is it particularly blocked by a few thin tree branches, or could my signal amplifier somehow not cope with this frequency after 10am!
I would really like to be able to watch the BBC other than early in the morning???
Any explanation for what is happening would be much appreciated.....surely at only 4 miles away I should have a great signal for all stations, not just ITV!?

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Peter Johnson's 1 post GB
Peter's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
6:04 PM

Peter Johnson: What is your actual signal level? Your just 4 miles away, with a good line of sight, so you really should have a problem.

However, two things point to your signal being too high, not too low (I know thats its my favourite explaination, but in this case...). Firstly, you say you have an amplifier. Why? Your just 4 miles from the transmitter! It might only be a 15w transmitter, but your still very close.

Secondly, BBC tend to have the strongest signals, so you'd expect to see them even if ITV was a bit dodgy. On the other hand, if you have too strong a signal, those BBC channels would break up first, and 'no signal' can mean too high a signal, not just too low. Search for 'too much of a good thing' on this site.

Check signal level on BBC1, and then try without the booster. You might be fine.

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MikeB's 2,463 posts Platinum Platinum GB
Dave Lindsay
6:28 PM

Peter Johnson: Different frequencies are affected by onjects in the way and in the surroundings. This is a law of physics. The only way all signals would carry the same is if there was absolutely nothing other than the transmitter -- so no trees, no ground, no buildings, no air (a vacuum) etc.

You are in fact 2.8 miles from the transmitter. This terrain plotter suggests that the line-sight is close to the ground and therefore could be obstructed:

Terrain between ( m a.g.l.) and (antenna m a.g.l.) - Optimising UK DTT Freeview and Radio aerial location

Obviously the terrain plotter samples ground levels every so often and therefore peaks and troughs may exist which aren't shown.

I do not think it a possibility that you could have too high a signal level as the transmitter is only 15W.

Switchover at Llanrhaeadr ym Mochnant happened in 2009 and the three channels used by the digital services were, and still are, 45, 49 and 42. In September 2011 Sutton Coldfield began to use these three channels for its COM services (those which aren't available from Llanrhaeadr ym Mochnant). While these channels are horizontally polarised, Sutton Coldfield is on about the same bearing as Llanrhaeadr ym Mochnant so the reason for poor reception could conceivably be due to this.

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Dave Lindsay's 5,724 posts Platinum Platinum GB

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