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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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Your comments: most recent posts are at the bottom

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Your comments are always welcome. Please use the form below to add your thoughts or questions to this page. We will get back to you as soon as we can.

M
M Roberts
Saturday 5 July 2014 12:31PM Wrexham

My itv channels are missing in the day and come back at night, why is this and will it return to normal



M
M Roberts
Saturday 5 July 2014 12:36PM Wrexham

My aerial is on the roof , my post code is ll12 0uw. But itv station keep going in the day and returning at night

J
jb38
Saturday 5 July 2014 7:35PM

M Roberts : Have you as yet checked with a neighbour to find out if they are also suffering from this problem? because if they aren't then you should make sure that your TV is receiving ITV from the Winter Hill transmitter on Mux C59 and not an ITV Mux from one of the other stations that's indicated (in theory) as being possible to receive in your area, all of using lower channel numbers which the TV is liable to latch onto during an auto-tune which starts at C21.

If though your neighbour is also being affected in a similar way to yourself then unfortunately the problem is out with your control, and with the reasons for possibly being atmospheric condition related as no engineering work is taking place at the transmitter.

Just out of curiosity, when your ITV vanishes during daytime can you still view ITV3(10) on Mux channel 58? this question being asked for the purpose of excluding the possibility of the problem being caused by a 4G transmission.

M
Maeve O'Hehir
Friday 11 July 2014 12:51PM Llandudno

My Postcode is LL30 2UL. Problems with ITV past few days at different hours, switches to other channels also (only at certain times).

J
jb38
Sunday 13 July 2014 8:27PM

M Roberts : If the signal into your TV's aerial socket is being fed via the recorder, then try connecting the aerial lead directly into the TV and carry out a retune, if this action doesn't restore ITV then carry out a "first time installation" or "manufacturers default setting" on the TV followed by another retune.

Another point to note being, that dependant on the DVD recorders brand / model, if the problem mentioned only occurs when the DVD is in standby then make sure that its not set on eco mode, as on some models the RF link through from the aerial is disabled when its set on this mode.

E
E R Pemberton
Saturday 19 July 2014 11:28PM

You say signals "... can be effected by ..." You should replace effected by affected.

GB
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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.

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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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