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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J
jon
Wednesday 18 September 2013 2:31PM

has anyone any thoughts on this? could it be the weather or the arial i have a booster in the loft


M
mazbar
Wednesday 18 September 2013 3:18PM

jon: it is most likely where you live. There are lots of trees between you and the transmitter. This could be a try and see where it works problem solving. Without a meter it is very hard to do. If you look at my old posts you can find my number I do cover st hellens I could check it out next week for you.


M
Margaret
Monday 3 February 2014 7:40PM

My nephew pressed the button on the remote that went on to set up menu n it took Chan 3 4 5 n 6 off my tv how on earth do I get them bk iv pressed the same button again n again but stil it won't bring them bk iv checked the aerial n that's fine please cud anyone help me get them bk iv not bin able to watch them for 2 wks now gutted


Dave Lindsay
Monday 3 February 2014 8:02PM

Margaret : If your TV has manual tuning then a manual scan of the UHF channel (frequency) which these services are broadcast on should restore them. Knowledge of your transmitter is required in order to say which UHF channel you need to tune to, or an idea as to your location plus probably direction of your aerial.


C
Chris Mileham
Thursday 27 March 2014 3:13PM

I had to re tune today, weather very wet and windy. Only came back with 22 channels BBC a and b multiplex. Postcode sr7, roof mounted digital aerial, with internal booster. I used to receive all channels.


Dave Lindsay
Thursday 27 March 2014 4:05PM

Chris Mileham: I am unsure as to how the weather can affect your receiver as it should be indoors. What was the reason for a retune?

SR7 is a very large area over which reception possibilities vary. However, across that area Pontop Pike is the most used full-service transmitter, so I shall assume that it is that which you are receiving from in the absence of knowledge of which transmitter your aerial is pointing to.

Refer to the page for <img src="http://img5.pseph.co.uk/cache/www.ukfree.tv/xico/www.ukfree.tv.png" class="xico" style="vertical-align:text-bottom" alt="www.ukfree.tv link icon"> link iconPontop Pike (County Durham, England) transmitter | ukfree.tv - 11 years of independent, free digital TV advice and at the top you will see it says Digital TV is "liable to interruption" - so there are ongoing engineering works.


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