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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?
My Freeview box has no EPG, is blank on FIVE, ITV3, ITV4, ITV2+1, has no sound o1
My ITV/C4 Freeview channels have disappeared - what can I do? Is it my SCART ca2
I have now lost all signal can you tell me what the problem might be?3
Is it possible to receive freeview cahnnels via a broadband internet connectio4
My high gain aerial can't get all the Freeview channels I expected5
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
Thursday, 3 March 2016
J
jb38
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.

link to this
jb38's 7,135 posts Platinum Platinum GB
Friday, 11 March 2016
P
phil
1:10 PM Cockermouth

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

link to this
phil's 2 posts GB
phil's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
Wednesday, 16 March 2016
J
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.

link to this
John Giblett's 1 post GB
J
jb38
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.





link to this
jb38's 7,135 posts Platinum Platinum GB
Sunday, 20 March 2016
K
Kay Flannagan
10:30 AM

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

link to this
Kay Flannagan's 2 posts GB
J
jb38
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.



link to this
jb38's 7,135 posts Platinum Platinum GB
Tuesday, 2 August 2016
W
William Bruce
4:59 PM Chatham

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.

























link to this
William Bruce's 1 post GB
William's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
M
MikeB
10:11 PM

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

link to this
MikeB's 1,886 posts Gold Gold GB
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