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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

Comments
Saturday, 23 April 2011
Briantist
sentiment_very_satisfiedOwner

8:13 AM

Lesley Ingram: What can I say?

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Briantist's 38,910 posts GB flag
Tuesday, 26 April 2011
C
cath
5:51 PM
Bury

up until yesterday we had great signal. Now we can watch all BBC channels, but all ITV channels, channel4 and more4 etc. are so badly pixalated we can't watch them, and sometimes they just freeze. Occasionally the signal comes back for a few moments then goes again. My postcode is BL0 0NY. Help!

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cath's 2 posts GB flag
cath's: mapC's Freeview map terrainC's terrain plot wavesC's frequency data C's Freeview Detailed Coverage
Briantist
sentiment_very_satisfiedOwner

6:04 PM

cath: Have you done everything listed at the top of the page?

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Briantist's 38,910 posts GB flag
A
Ash
7:52 PM
Nottingham

Hi, still tearing my hair out here. Have a Samsung digital LCD Tv - everything working perfectly since August 2010. Went off on hols on 31st March, returned on 14th April to find none of the ITV channels or C4, but everything else. Contacted digital UK and they advised disconnecting the aeriel, re-tune to delete the channels, then re-connect and do a manual re-tune using UHF channel numbers: 49, 31, 33, 29, 45, and 42. All of them find channels, apart from 31 and 29 - basically the ITV and C4 groups.

How can whoever has organised this whole programme/scheme etc. be allowed to just get away with depriving people of channels suddenly, just like that?! The whole thing seems bizarre and apart from the help on this site, there seems to be no national public awareness around these issues going on. It is scandalous and I still don't know how I will get these channels back, or when!

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Ash's 2 posts GB flag
Ash's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
Briantist
sentiment_very_satisfiedOwner

8:18 PM

Ash: No one is "depriving people of channels", it is most likely that you have some RF conflict that you didn't have before, as listed at the top of the page.

Your Multiplex 2 reception was and still is "marginal" until switchover anyway.

You can either find you local problem, or just wait until 31st August 2011.

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Briantist's 38,910 posts GB flag
V
Vicky
9:48 PM
Bradford

Hello,

I live in Wrose, Bradford West Yorks. Postcode is BD2 1PZ. Ive lost ITV1, 5, All the 4's. I thought it was becuase of my old Freeview box and just wasted money buying a new one as all these chanels still dont work at all... What do I do? My ariel is in the loft. Thanks, Vicky

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Vicky's 1 post GB flag
Vicky's: mapV's Freeview map terrainV's terrain plot wavesV's frequency data V's Freeview Detailed Coverage
Briantist
sentiment_very_satisfiedOwner

11:25 PM

Vicky: I would move the aerial to the roof from the loft.

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Briantist's 38,910 posts GB flag
Wednesday, 27 April 2011
J
Jim F
sentiment_satisfiedSilver

10:30 AM

Vicky,
Just a thought - some coax plugs use a tiny screw to secure hold the coax centre core. Over time, this can unscrew itself and cause a short circuit to the outer shell of the coax plug (which can in turn knock out all, or some, of your channels).
Check any coax plugs you have - also, if you have a flylead from a wall socket to the TV, try a different (preferably known good) lead.

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Jim F's 141 posts GB flag
Sunday, 1 May 2011
A
Anthony
9:33 AM
Bewdley

Since maintenance work on the Sutton Coldfield transmitter last week, I have lost all of my multiplex 2 channels and Multiplex B? (channel 5 etc). I have reset everything as recommended and have done that many re-scans that I have lost count. We had a freeview box in the living room and a freeview television in the bedroom that worked pretty much perfectly apart from the odd channel.The ariel is only 3 years old and I thought we had bought a wideband one, although I am beginning to doubt that now. I am pretty sure there is not too much of a local interference problem as everything worked so well before. Should I go for a new ariel? My postcode is DY12 2UZ. It is on the edge but we had pretty good reception until last week.

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Anthony's 1 post GB flag
Anthony's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
L
laura m
6:22 PM
Lincoln

hiya
recently my freeview box has lost all of the itv channels, e4 channel 4 and channel 5, basically all of the channels in one of the groups. i read the advice above, unplugged my ps3, wiped all the channels and rescanned everything but it still cant find them, so im assuming its the ariel. i just want to no why the ariel was working before but now it isnt? and also where can i get a new one? i dont no anything about ariels, how do you no which is the right one? thank u :)

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laura m's 2 posts GB flag
laura's: mapL's Freeview map terrainL's terrain plot wavesL's frequency data L's Freeview Detailed Coverage
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