Hi mike. Thanks. But my signal strength is 70-76% for most channels with the HD oNes all being 76 so too strong a signal would not seem to be the problem especially as my problem only started 4 weeks ago. Any other suggestions?
Kevin Ross: Have you checked that you are tuned to Black Hill rather than Darvel, assuming your aerial points to it? Darvel's channels are lower down and will therefore be picked up before Black Hill's.
Kevin Ross: The UHF channel numbers I gave above are normally given on the signal strength screen. Confirm that those of Black Hill are tuned rather than those of Darvel.(I assume here that your aerial points to Black Hill which is due east.)
If you find that it is tuned incorrectly then you need to retune, either by:
- clearing what's already stored and manually tuning the five (six if it's HD) channels, or;
- having the aerial unplugged for the first portion of the scan where Darvel's channels are scanned.is one way to avoid it. Plug in at 30% or once it's scanned UHF channel 30 if it gives channel numbers.
However, this only need be done if it's tuned incorrectly.
Communal aerial systems are often filtered so as to only allow through from the aerial the frequencies used by the designated transmitter. Therefore, under such circumstances it's not possible to pick up the "wrong" transmitter.
Any 4G 800MHz filter should be fitted before any signal amplifer/booster as the 4G signal can overload it. As it's a communal system then it will have an amplifier and so fitting the filter in your dwelling won't stop the 4G signal from going through the amp.
See if others in the block have the same issue. The fact that they don't doesn't necessarily mean that it isn't an aerial system problem but the fact that you have been provided with a 4G filter suggests that your address could be expected to issues. In which case you need to contact the party responsible for the aerial system to get it put right.
You will not need a filter adjacent to your TV/box as the system will be filtered, so it will serve no purpose.
My advice would be to keep it. at800 (the organisation giving out these filters) is only giving one per address. If you know someone who needs two you might like to donate your unwanted one, rather than throwing it in the bin.
Kevin Ross: Try a different lead from wall socket to Youviewbox. If the problem remains then it rather points to the issue being with the signal that is coming out of the wall socket, in which case it doesn't actually matter what the issue is as it's not your job to fix it - you simply report it to the responsible party.
But the fact that the 4G filter arrived and that the signal is poor suggests that it could be a 4G signal overloading the amplifier, which needs an engineer sort it.
Michael: Thank you everyone for your comments. I have since tried a TV with inbuilt freeview which worked fine, suggesting that the signalquality etc is good. But we realised that my old box was not picking up at least some of the HDchannels. So it appears that the problem might be my old box, being unable to receive HD, with the problem now very much with the non-HD channels BBC1 and 2 when we often get no picture at all, while channel 3 and others are generally reasonable.Could it be that non-HD BBC1 and 2 have become weaker over the past few weeks, and now are weaker in some way than other non-HD channels? Not sure about the correct terminology by the way.
Michael: You tried in with another device - what was the transmitter the TV was tuned into, and what where the signal/quality levels?
Assuming they were fine, and it was to Sandy Heath, two things occur to me.
Firstly, your problems are still with BBC1 & 2. They tend to be more powerful signals, so if you do have too high a signal strength (and you are really pretty close to the transmitter), they will be the first ones to really have a problem. The TV you tested might just have a rather less sensitive tuner than the box.
There is no reason why BBC1 & 2 might have become weaker suddenly, so logically, if the signal is weaker, it must be something in your system at fault. Since the TV you tested was fine (it would be nice to know the make and model, as well as the readings), I suspect that its the box, and its simply a bit more sensitive, hence the no signal problems, etc.