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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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How do I get a test card with Freeview3
What can I do when my Sky Digibox says 'No Signal' or 'Technical fau4
Can I receive UK TV in Ghana?5
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
I have a Durabrand cg5660-m and I need the lock key code!3
What is the Inversion Effect and why does it effect my Freeview TV reception? 4
My high gain aerial can't get all the Freeview channels I expected5
What are the aerial types about? Are they high-gain?6

Comments
Saturday, 26 February 2011
I
ian
4:48 PM

could a freesat dish cause problems? next door has one on the outside wall and my box is around 15ft away virtually directly in line with it.

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ian's 7 posts GB flag
I
ian
4:50 PM

Error message says no audio/video 850mhz

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ian's 7 posts GB flag
Sunday, 27 February 2011
Briantist
sentiment_very_satisfiedOwner

5:49 AM

ian: No, a dish should not effect reception.


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Briantist's 38,910 posts GB flag
Tuesday, 22 March 2011
S
simon
11:44 PM

i have lost channels 1 to 8 bbc 1 2 itv 1 channel 4 channel 5 on a panasonic tv in kitchen.rest of freeview channels work fine on that tv.samsung tv in lounge 10 ft away all channels on freeview work. tried factory reset,retuning for software update. switch tv off and unplug aerial and retune.after retune screen is displayed saying the channels are these numbers i.e bbc1 is no 1 but there not there.any ideas.thanks simon

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simon's 1 post GB flag
Saturday, 26 March 2011
LutonFan
sentiment_satisfiedGold

3:54 PM

simon- Is the main aerial lead plugged into the Samsung or the Panasonic? If it is plugged into the Samsung, are you using an indoor aerial for the Panasonic?

If the latter, try plugging the main aerial lead into the Panasonic and re-tune the set.

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LutonFan's 382 posts GB flag
Monday, 28 March 2011
J
john
12:50 AM
London

The Multiplex 2 channels have dissappeared. It all worked fine on Friday night and now its gone. I am in North London. Is there work being done? I have all the BBC channels but missing ITV, 4, 5, and the rest. Any solution to this ? Postcode... is NW11 7RJ. Could it be the cable or the aerial needs adjusting? Any advise at all will be greatly appreciated.

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john's 2 posts GB flag
john's: mapJ's Freeview map terrainJ's terrain plot wavesJ's frequency data J's Freeview Detailed Coverage
Wednesday, 30 March 2011
Saturday, 16 April 2011
D
Danny Fitzpatrick
7:41 PM

I am based in Derby post code DE736NJ
on the 13th of April the Nottingham switchover happend and from midnight I lost all of my multiplex channels for itv/c4. I have to new TV's both with freeview, one Samsung and one Sony. I have tried everything to get these channels back but nothing seems to work. (Tunning without the airial in to clear the presets, then retune with airial was the last suggestion?) any help and advise or contavt number would be appreciated.
Thanks

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Danny Fitzpatrick's 1 post GB flag
K
KMJ,Derby
sentiment_satisfiedGold

10:34 PM

Danny Fitzpatrick: If possible do a factory reset then manual tune on each of the Waltham muxes. C49, C31, C29, C33, C45 and C42.Take note of the signal quality on C31, if it is poor it indicates interference or a "messy" signal which may result in no channels being found. When autoscanning if the Mux2 channels are present in the channel list but are unwatchable check in the 800s for a duplicate that works correctly. You are able to receive signals from Sutton Coldfield and Nottingham/Kimberley which could also have been found when scanning.

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KMJ,Derby's 1,811 posts GB flag
Sunday, 17 April 2011
A
adam
4:45 PM

dear friends

i have two samsung digital tvs in my flat. since the digital switchover i have lost all group 2 channels (itv, channel 4,five, itv2, etc} i am based in cambridge so we use the sandy heath transmitter. have tried all the usual ways to get these channels back - reset tvs, unplugged areial and then retuned....nothing works..very frustrating. usually i am very competent with this sort of thing but i am having no joy this time round!! anyone out there that can help??? would be greatly appreciated!! im thinking it could be that we live in a small block of flats with a communal digital aeriel which none has access too??? any help would be great!! thansk adam

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adam's 1 post GB flag
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