All posts by Dave Lindsay
Below are all of Dave Lindsay's postings, with the most recent are at the bottom of the page.
Nicki Hardy: In situations such as that which you describe, I would not retune any TV. The symptoms suggest a problem (of some sort) with the signal. Running the retuning scan simply causes more problems because now you have to retune it when you get the signal back.
If you have an amplifier for distribution to the 4 outlets, I would check that it's powered on. Then try bypassing it by connecting the lead from the aerial to the output to one of the TVs. Then go to the TV and see what you get.
You might need an adapter to connect the lead from the aerial to the lead to the TV (wall socket) because they might be the same gender.
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Alan: Are there any phono sockets on rear of the Sony TV? If so, which ones?
I'm not familiar with the Sky+ box. Does it have two Scarts and if so could you daisy-chain with the DVD player on the input (and TV on the output)?
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jb38: How do tuners get desensitised?
Is this desensitisation which occurs during the automatic tuning scan? And having "seen" a high-level signal it takes time for it to re-adjust?
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Keith: I've never experienced this first-hand, and am just commenting based on what I've read.
I wonder if it could be interference from ethernet home plugs. See here:
Powerline HomePlug Adapters - The Pros and Cons
In this video a radio-ham has recorded the noise generated by these things:
UKQRM Video showing the interference caused by BT Vision
- YouTube
Is this what you're experiencing?
You can buy them for use with any ethernet connection, but BT can supply them for use with its BT Vision box, instead of installing a network cable. See here:
BT Comtrend Powerline HD Ethernet Female Kit (055866) - BT Shop
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Keith: Thanks for the link. I will keep an eye on it. Let us know if you pin it down to anything.
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Sarah k k: An outside aerial is preferred.
Don't expect perfect reception with an indoor aerial (that is not to say that perfect reception can ever be got). It is common to find that that certain channels can be picked up better than others in one location. Then moving the aerial might make some worse and others better. Finding that sweet spot where they all work can be tricky. And then there's the possibility that people moving around or vehicles passing by might affect reception.
In general, with an indoor aerial I would be looking to put it at the side of the house that the signal comes from. If there are obstructions outside, e.g. walls, another house, an annex or garage, try and position it so that these aren't in the way (or so that there as few a walls as possible. You may have to use an extension lead so that you can move your aerial further away from the television.
But as I say, if possible, get a roof-top aerial.
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Michael J Gunnill: I would try manually tuning in the missing multiplex first. If your aerial is on Crystal Palace, it is C22.
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R.W.Witton: Please give your post code so we can get an idea what transmitter you might be using. What transmitter is your aerial pointing at (or what direction is it pointing in and what is your post code)?
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Peter: Is your aerial pointing at Hannington (305degrees) or Crystal Palace (72degrees)?
Do you get London programming or Meridian programming?
Perhaps your aerial is on one but your TV is tuned to the other.
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Sunday 4 December 2011 10:55PM
Nicki Hardy: The fact that all TVs have failed and that (most) analogue is poor suggests a fault with your amplifier, aerial or the cable which joins it. So I think that there is nothing that can be done without going up into the loft.