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Help: My ITV/C4 Freeview channels have disappeared - what can I do? Is it my SCART cable?
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My ITV/C4 Freeview channels have disappeared - what can I do? Is it my SCART cable?


My ITV/C4 Freeview channels have disappeared - what can I do?

It is a feature of television signals that they can be effected by the weather. Aside from the obvious damaged that can be caused by wind or torrential rain, the onset of summer can cause a more intriguing problem called "inversion".

Basically, when the sun heats up the land, the hot air can get trapped below cold air at high level. This creates an "inversion layer" which acts like a polished mirror to TV signals. This causes two problems: you can receive both the original and a reflected signal from your own transmitter (on analogue TV this appears as "ghosting") or interference from TV transmitters that are normally too far distant.

The ITV/C4 multiplex of channels (ITV-1, ITV-2, ITV-3, ITV-4, CITV, C4, More4, E4, Quizcall) use a transmission "mode" called 64QAM, and it is sadly much more prone to these problems.

So, whilst a loft-mounted aerial will provide reception at some time, it will fail at others. The only real solution is to mount the aerial (or a new Class I aerial) outside on a pole, but some people report that changing the cable from the aerial to the set-top box to the high-grade satellite cable can also help.

The SCART connection, by the way, only carries a single TV picture, not the Freeview transmission multiplexes, so if this is disconnected it will result in degradation to every channel at once.



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D
dee price
Tuesday 26 August 2014 8:37PM

I lost all Freeview channels around 6.30pm 25 Aug 2014. Retuning changes nothing. BBC channels fine, good receptiom. The missing channels don't show on the list of progrannmes anymore. Surely it can't be a problem with the aerial if BBc reception good. Never had thi problem before - any ideas? Dee

M
MikeB
Tuesday 26 August 2014 10:46PM

dee price: We could do with a postcode, but in the meantime, check your aerial system. BBC channels are usually the strongest, so if your system has had a partial failure, then they are the ones that might be OK, with the others vanishing.

J
jb38
Tuesday 26 August 2014 10:54PM

dee price: Its not really possible for anyone to offer advice on problems of this nature without having knowledge of a persons location, this preferably being in the form of a post code or one from nearby, e.g: a shop / Post Office etc, this enabling access to info regarding the transmitters that cover the area.

On the subject of the channels not showing on the programme list, it has to be assumed that you have carried out a retune? because channel info does not disappear from programme listings except by retuning whilst the transmitter signal is down, and why TV or boxes should never be retuned just because the signal has vanished, as the data is "still" stored in the tuner.

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Please post a question, answer or commentIf you have Freeview reception problems before posting a question your must first do this Freeview reset procedure then see: Freeview reception has changed, Single frequency interference, and Freeview intermittent interference.

If you have no satellite signal, see Sky Digibox says 'No Signal' or 'Technical fault'

If you have other problems, please provide a full (not partial) postcode (or preferably enter it in box at the top right) and indicate where if aerial is on the roof, in the loft or elsewhere.

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