menuMENU    UK Free TV logo Freeview



Click to see updates

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, 19 May 2011

10:03 PM

Robin: I think you're going to have to wait for the "power up" on 14th September 2011.

link to this comment
Briantist's 38,910 posts GB flag
11:07 PM

Thanks Brianist
Yes they are all in the same multiplex and yes I've tried everything recommended but to no avail. As nothing has changed except the signal (still using the same gear as when I could get a signal) I Guess I'll just have to wait for the power-up as well.
Hey btw didn't I see you in that movie "taxi"?

link to this comment
Jacktar's 5 posts GB flag
Jacktar's: mapJ's Freeview map terrainJ's terrain plot wavesJ's frequency data J's Freeview Detailed Coverage
Friday, 20 May 2011
12:01 AM

OK Briantist, I suppose we can survive the summer without these channels,

link to this comment
Robin's 3 posts GB flag
Robin's: mapR's Freeview map terrainR's terrain plot wavesR's frequency data R's Freeview Detailed Coverage

7:46 AM

Robin: You can watch the channels online using the links in the right hand column.

link to this comment
Briantist's 38,910 posts GB flag

7:49 AM

Jacktar: Yes, I suspect you are going to have to wait until September, but as I said above, you can watch the channels online using the links in the right hand column.

link to this comment
Briantist's 38,910 posts GB flag
10:12 AM

Hi I must be going daft or blind as I can not find "under the "Free RF channels" section, on the My Freeview reception link as mentioned at the top of the page, as I need to alter the RF output on my Sky+ box. I am at B37 6BT.

link to this comment
AlvinF's 19 posts GB flag
AlvinF's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
Dave Lusted
12:40 PM

I am usaing the Whitehawk Hill Transmitter in Brighton.
During the day all channels on C55 (746.0MHz) are received without problems. However at night all the channels break up or are pixalated. Why does this only happen at night? is there anything I can do to remedy the situation?

link to this comment
Dave Lusted's 3 posts GB flag

1:11 PM

AlvinF: They are now listed on the top right of each page in your "MY SETTINGS" box.

link to this comment
Briantist's 38,910 posts GB flag
4:19 PM

I get STV in Dunoon Argyle but the sound keeps fading up and down every other channel is ok... is there a reason for this ?

link to this comment
jas4u's 1 post GB flag
Select more comments

Your comment please
Please post a question, answer or commentUK Free TV is here to help people. If you are rude or disrespectful all of your posts will be deleted and you will be banned.

Privacy policy: UK Free Privacy policy.