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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, 3 March 2016

7:53 PM

phil: Your problem is most likely down to the engineering work which is presently being carried out at the Caldbeck transmitter, a notice warning of "Possible weak signal" having been posted on the engineering page, a weak signal causing drop out in some areas dependant on the level normally received.

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jb38's 7,179 posts GB flag
Friday, 11 March 2016
1:10 PM

jb38: Thanks there does seem to have been a recent improvement

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phil's 2 posts GB flag
phil's: mapP's Freeview map terrainP's terrain plot wavesP's frequency data P's Freeview Detailed Coverage
Wednesday, 16 March 2016
John Giblett
4:14 PM

Hi my post code is s433uq Riverdale Park Staveley. I have lived on the park for 12 months, I have a
digital Mega Boost Arial that has been working well for the last 9 months, apart from the odd bit of
fragmentation, but in the last three days not only my TV, but other people have had problems with
complete fragmented picture loss and informing us that there is weak or no signal. This must be
a problem that is out of our control, can we please have an answer as we are very frustrated at
paying the licence fee and not getting a good service. Regards John Giblett.

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John Giblett's 1 post GB flag

8:54 PM

John Giblett: Engineering work is presently being carried out on a number of transmitters in the Yorkshire area, a warning of "Possible service interruptions" seen listed against Chesterfield.

That said is on the assumption that your reception is from said station? as "some" viewers in your area are able to receive Freeview from the Emley Moor transmitter (@ 27mls/330 degrees), if you happen to be one of them? then no faults are listed against this station, although its noticed that the signal path from this station suffers from multiple line-of-sight obstructions from roughly 8 miles prior to your location.

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jb38's 7,179 posts GB flag
Sunday, 20 March 2016
Kay Flannagan
10:30 AM

Can anyone tell me where the mast is for Venables Avenue Colne Lancs? Thank you

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Kay Flannagan's 2 posts GB flag

1:46 PM

Kay Flannagan: Your area is indicated as receiving the best signal from the Pendle Forest transmitter, the station located near to the village of Fence at approx 4 miles away / 254 degrees, aerials pointing towards this transmitter having to be vertically mounted (elements up/down) for reception.

Winter Hill @ 25miles / 222 degrees is also receivable in your area, aerials pointing towards same being mounted horizontally, i.e: flat.

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jb38's 7,179 posts GB flag
Tuesday, 2 August 2016
William Bruce
4:59 PM

Hi I'm at me5 8xe area Chatham today no TV signals for free view chaview or other channels available. Use a TV with free view channels up on TV? , set up and aerial on roof. What is the cause please.

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William Bruce's 1 post GB flag
William's: ...

10:11 PM

William Bruce: Check the transmitter on this site - if its fine, its you. Probably a break somewhere on your aerial system.

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MikeB's 2,579 posts GB flag
Thursday, 29 December 2016
Chris Shipton
8:38 PM

I've suddenly lost all channels on COM 4 mux. My postcode is CT3 4DA. I don't have any other equipment powered on and signal on other muxes is quality 100% strength 90+%. I've done a rescan. I think we're on the dover transmitter. Any ideas??

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Chris Shipton's 1 post GB flag
Chris's: mapC's Freeview map terrainC's terrain plot wavesC's frequency data C's Freeview Detailed Coverage
Thursday, 28 December 2017
6:44 AM

Every day at about 5pm my TV starts to breakup please can any one tell me why this is i have a smart TV so no box i recevie my singal from wenvo.

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ALLAN's 1 post GB flag
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