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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T
Trevor Martin
Tuesday 22 April 2014 10:20AM

Hi Hopefull can shed some light on my problem.

I have a Tosheba with built in Freeview.

Up until last Friday we were receiving all channels & and a good picture however since sunday past we are unable to receive ITV1 our transmitter seems to be Clarendon Hill mux C25.

Have attempted an auto re tune but i get BBC1 then BBC2 and BBC3 but no ITV1 ?

Any suggestions please in basic terms please as i am not a TV engineer.

Cheers Trev.


J
jb38
Tuesday 22 April 2014 3:22PM

Trevor Martin: I have already replied to this question yesterday at 08.40PM and which you had made under a different heading, this being seen by opening the undermentioned link.

However, in addition to that said, if manually tuning Caradon's C25 does not resolve the problem then carry out a "factory reset" on your TV followed by an auto-tune, this also known as "default setting", "first time installation" or a similar sounding term.

http://www.ukfree.tv/helpme.php?faqid=1107051078&irt=751008&PGSTART=350#b751008


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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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