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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
Can I stop paying Sky and use my satellite receiver to get Freeview ?1
My Sky box has a "no signal message" - what do I do?2
What can I do when my Sky Digibox says 'No Signal' or 'Technical fau3
Can I use my ex-contract sky digital satellite receiver to get Freeview channels4
My Freeview box has no EPG, is blank on FIVE, ITV3, ITV4, ITV2+1, has no sound o5
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
Friday, 20 March 2015
J
jb38
9:38 PM

Karen McIntyre: Although in areas such as yours the Freesat route is indeed the best way to go, as reliable reception is virtually guaranteed using this mode, heavy thundery type downpours or snow on the bowl of the dish being about the only things that can affect it, although only for a one or two minutes or so in the case of a downpour. But though purely out of curiosity, on the occasions where your reception has gone downhill, are you aware as to whether or not your neighbours are also experiencing similar difficulties with their reception?




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Monday, 20 April 2015
M
Margaret
10:32 AM

I have a year old 50 inch jvc . it did have 6o channels. now only 9. I have retuned and even reinstalled. still only 9 channels ????

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Margaret's 3 posts xx
J
jb38
7:17 PM

Margaret: Advice as to the possible reason for your problem can only be given once the following points are known.

(1) : Your location, this preferably being in the form of a post code or one from somewhere nearby, e.g: a shop / post office. This info being necessary in order to access information on the transmitter covering your area.

(2) : Do you have your own aerial? or are you connected into a communal system? such as used in apartment blocks etc.

(3) : Is the aerial connected directly into the TV? or does it pass through some other device first?


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jb38's 6,419 posts Platinum Platinum xx
Tuesday, 21 April 2015
M
margaret
10:52 PM

The aerial is digital and is in my loft, there is another television also connected to that aerial in separate room, that gets all the 80 stations. they both connect directly to the television, both tvs have built in freeview. I am near ka24 4jg

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margaret's 3 posts xx
margaret's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
Wednesday, 22 April 2015
J
jb38
12:09 AM

margaret: The Dalry area is indicated as being served by either the Darvell or Blackhill transmitters, the latter providing a better signal as far as the commercial channels are concerned.

However, as the TV in the second room would apparently receive all the channels OK, this then indicates that the signal is actually there, but is possibly being received at a level under that necessary to resolve a picture on your main TV, as tuner sensitivities vary from set to set.

Therefore, if your main TV is not wall mounted? you should try temporarily connecting it into the outlet socket used by the TV in the other room followed by carrying out a retune, if this results in the restoration of all channels? then the next stage is to reinstall the TV into its original location followed by checking that the channels normally viewed are still there.

Should they be OK? then this is inclined to suggest that your system could benefit from the addition of a powered amplifier / splitter to feed a higher level of signal into your two aerial outlet points.

However, before carrying out any of the aforementioned procedures, you should try carrying out a manufacturers reset on your TV or box, this procedure also known as "default setting" or "first time installation".





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jb38's 6,419 posts Platinum Platinum xx
Friday, 24 April 2015
M
margaret
10:15 AM

thanks will try it.

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