All posts by Dave Lindsay
Below are all of Dave Lindsay's postings, with the most recent are at the bottom of the page.
andrew lonsdale: This isn't 4G interference because 800MHz signals aren't in operation yet.
I would suggest that the issue might be the trees on top of the hill over which you're receiving - those being Hob Hill Wood and Dog Kennel Wood.
The signal path to Bilsdale isn't good, with it being obstructed, although it might be worth a shot.
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andrew lonsdale: Moving southwards along Byland Road there are quite a few Bilsdale-facing aerials. Is there a reason yours isn't likewise?
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Derek Matravers: Perhaps the trees in the direction of Wenvoe are causing your difficulty.
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Stephen: I looked on Streetview and the aerials on long poles tells the story.
I do note that some houses have an aerial on Winter Hill and one on Moel-y-Parc, which is 90 degrees clockwise from the former. If yours is one of these and the feeds of both aerials is combined into one downlead then you may have to say goodbye to this convenience. This is because the diplexer, which is the box that combines the two feeds, will probably "split" at C51, meaning that C50 and C49 are now being picked up by the Moel-y-Parc aerial.
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Derek Matravers: The text following the "Horizontal" relates to the power. The highest power is "max" and "-3dB" means what it says relative to the "max", which in this case is half-power.
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Derek Matravers: Don't ask why the one exception?
Instead, consider a single signal. It 'bends' (defracts) around an object, in this case the high ground over which you are receiving. The effect is that in the shadow of that object the signal isn't dispersed uniformly there are some good spots and some not-so-good spots.
The dispersal effect varies by frequency. Therefore each frequency will have its own "good spots" and "not-so-good spots". Hence there will be places where they are not all good at the same spot.
The same goes for refraction when signals pass through an object such as a tree.
The objective when siting an aerial is to put it in a spot where all channels are good. However, if the objects which cause the defraction (the hill, including anything on top of it such as trees) and the refraction (caused by the trees in front of the aerial) change/move then this could have implication on the signal(s) received.
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Graham Chamberlain: I suggest that you speak to BBC Engineering on 0370 010 0123 and explain the issue, including that it affects others.
I reserve judgement on how successful I think you might be(!)
That said, the BBC is Public Service Broadcaster so may have obligations to sort out issues, although I'm not sure what it could do, apart from change the channel, if one is available. That then begs the question as to whether the other two channels should be changed for the same reason.
Looking at the projected coverage map of Hannington on this site I think that it is a likely cause.
Please keep us posted on how you get on.
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Pete Green: Nothing, as these services were never on "Freeview".
"Freeview" is the brand name of the free-to-air digital terrestrial television (DTT) services.
There are some subscription services carried on DTT. These are by their nature not "free-to-air" and so don't come under the auspices of "Freeview".
The subscription slots formerly occupied by Sky Sports 1 and Sky Sports 2 were, I understand, paid for by BT. BT then allowed customers to subscribe to these services. BT has decided to replace the two Sky Sports services with its own BT Sport services.
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Simon Van Hear: In response to your question "Who is this???"
I would have thought that you would have been able to answer your question by searching the internet...
"Digital One" is the national commercial multiplex operator:
ukdigitalradio: About Us
NOW Digital is the operator of the local Cornwall and Plymouth multiplex:
NOW Digital Ltd
NOW Digital Ltd
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Tuesday 2 July 2013 7:44PM
Graham Chamberlain: In which case, perhaps it is interference from Hannington which uses the same three channels, albeit horizontally.