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

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?
published on UK Free TV

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.

All questions
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In this section
My Freeview box has no EPG, is blank on FIVE, ITV3, ITV4, ITV2+1, has no sound o1
I have now lost all signal can you tell me what the problem might be?2
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What is the Inversion Effect and why does it effect my Freeview TV reception? 4
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What are the aerial types about? Are they high-gain?6

Monday, 18 April 2011
Sunday, 15 May 2011
anne hamilton
9:19 PM

hi we have lost the following channels itv3
fiver, fiver usa,qvc.we have an lg tv new with freeview and have retuned twice back to factory settings please give advise . our postcode is bt476yy we get our digital signal from limavady.

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anne hamilton's 1 post GB flag
Saturday, 4 June 2011
Don Johnstone
8:07 PM

Think we should rename this to the great digital scam rather than changeover.Everything great before but more and more channels disappearing and the answer is get better equipment.Sorry but that is not what I call an improvement but maybe I'm stupid.Never mind, you lot will make a fortune selling the analogue frequencies so it's obviously worth it.

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Don Johnstone's 2 posts GB flag
Sunday, 5 June 2011

1:07 PM

Don Johnstone: Who said the answer was to get better equipment?

You have not provided a postcode, so I can't be sure, but the most likely explanation is that you are using a booster and you need to remove it from your system.

If you don't have an amplifier, you probably need an attenuator, and they cost about a fiver.

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Briantist's 38,915 posts GB flag
Wednesday, 15 June 2011
David Stickland
4:54 PM

I have installed a new digital aerial (SLX48DW HIGH GAIN WIDEBAND) at my home in Littlehampton West Sussex. I re tuned the channels on my Samsung freeview TV, everything went fine until the afternoon, I have lost most of the channels, including CH4 & ITV1, I still receive a good picture on the BBC programmes. Why should the signal go from good to bad in such a short time. Any suggestions ? With Thanks. David S.

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David Stickland's 1 post EU flag
kim henderson
8:56 PM

i have no reception to night on itv1 and 2 channnel five channel 4 more etc

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kim henderson's 1 post GB flag
Monday, 20 June 2011
barbara donnelly
3:07 PM

i have a roof aerial this morning i had all the itv channles now none the tv screen says invalid channel on itv any help would be gr8

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barbara donnelly's 1 post GB flag
barbara's: mapB's Freeview map terrainB's terrain plot wavesB's frequency data B's Freeview Detailed Coverage
Sunday, 3 July 2011
sue smith
7:56 PM

i moved from area in Swindon to another area in Swindon my freeview box could get every channel now at my new address i cant get ITV and Channel 4 and 5 programs am using ariel in loft and this is to tv in bedroom the tv downstairs can get every channel and uses the ariel on the roof is this because the one in the loft mybe pointing the wrong way? would a boost connected to freeview box solve this problem or shall i get an indoor ariel that i can use by me tv would that work???

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sue smith's 1 post GB flag
Sunday, 10 July 2011
1:51 PM

i have a tele with built in freeview which has always worked fine i bought a freeview + box and when i plug the scart lead in i lose some channels

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kerrie's 1 post GB flag
kerrie's: mapK's Freeview map terrainK's terrain plot wavesK's frequency data K's Freeview Detailed Coverage
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