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Single frequency interference

What to do when several channels are missing, but they are all on the same 'multiplex'

What to do when several channels are missing, but they are all
published on UK Free TV

There are several different type of interference that cause problems. This page deals with the situation where:

There are two main causes of this type of intermitted interference: The current Freeview mulitplexes are shown in this diagram. If all of your missing channels are on a single row, you have "single frequency interference":

Local analogue interference

Local analogue interference is caused by household video devices that you can attach to a television such as:
  • Sky Digibox;
  • Video cassette recorder (VCR);
  • Personal digital video recorder (PVR);
  • Games console;
If you have any of these devices, you will need to work out which of these is blocking the reception of a Freeview multiplex by turning off the suspect device and then rescanning for channels on the Freeview box.

If powering off the device restores the Freeview channels from the blocked multiplex, you will need to either stop using the problem device's RF output by disconnecting the RF output cable permanently, or by changing the RF channel number that that device uses. See, for example, How do I change the RF output channel on a Sky Digibox?

You can find a list of the frequencies that are not in use at your location by putting your postcode into the My Freeview reception and looking under the "Free RF channels" section.

Non-wideband aerial in some areas

In some places you will need a wideband aerial to receive all the Freeview multiplexes. For example in Central Birmingham, the Sutton Coldfield has multiplex D on an 'out of group', so you cannot view Film4 or ITV2+1 without an aerial upgrade.

To find out if you need an aerial upgrade, see My Freeview reception.

Help with Freeview, aerials?
How do I get a test card with Freeview1
I would like to know if it is possible to receive UK terrestrial Freeview servic2
I have been told I would receive too much singal from my Freeview tansmitter as 3
Can my Freeview box receive more than one BBC and ITV region?4
Is it true that my 87 year old mother is entitled to a FREE upgrade when the ana5
In this section
Official aerial installers guide to the TV spectrum future1
Which free digital TV system will give me the most reliable reception?2
High pressure causing channel loss through "Inversion"3
Digital Region Overlap4
Freeview reception has changed?5
Two frequency interference 6

Thursday, 21 April 2011
Lesley Ingram
6:50 PM

I have just diagnosed a 'single channel interference' - but don't know what to do about it. I have deleted and reset all channels but still can't get the one with itv3. (52.0506,-2.71021) 

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Lesley Ingram's 3 posts GB flag
Lesley Ingram
6:51 PM

Sorry - single frequency interface.. - (52.0506,-2.71021) 

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Lesley Ingram's 3 posts GB flag
Friday, 22 April 2011

5:49 AM

Lesley Ingram: Please read the article at the top of the page.

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Briantist's 38,915 posts GB flag
Lesley Ingram
9:37 AM

Hi Briantist - yes I've read it but don't understand - I'm not a tekkie person...

is it saying that the aerial is no good because I need a wider band ??? :o

I'm in Hereford.
Thanks. (52.0506,-2.71021) 

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Lesley Ingram's 3 posts GB flag
10:39 AM

have same ITV channels issue in Kent. Had new booster fitted yesterday but still missing channels. Help !!

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Liz's 1 post GB flag
1:38 PM

my digital tv has just stopped working i can get a crackling sound and a fussy picture but the tv a=in lounge alright its is getting me down is it to do with the changover my post code is wr7 4qg

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mary's 1 post GB flag
mary's: ...
4:56 PM

Hi...thanks for your response to my earlier seems that it is something they have done to the signal....uhf 31, i have got such bad pixelation that I cant watch the programmes at all...and that suddenly happened....if I get a wideband ariel..will that fix the problem? If i get a wideband ariel to go in the loft..will that be okay? cant afford to get someone in and get a new ariel at their costs...!but seemingly can get a decent ariel on internet...which would you suggest for ln6 area situated in loft? Thanks again for your advice and knowledge!

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Naomi's 2 posts GB flag
Naomi's: mapN's Freeview map terrainN's terrain plot wavesN's frequency data N's Freeview Detailed Coverage
Saturday, 23 April 2011

8:06 AM

Liz: I can't really help without a full postcode.

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Briantist's 38,915 posts GB flag

8:10 AM

Naomi: You would already have needed a wideband aerial to receive the broadcast of multiplex 2.

You should use a rooftop aerial, not a loft one, for reliable Freeview reception.

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Briantist's 38,915 posts GB flag
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