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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
Wednesday, 6 April 2011
B
belinda
11:27 AM
Bromsgrove

have 4 tv in house two are on sky no problems.the one in kitchen has inbuilt freeview retuned no problem have all channels.but tv in my sons bedroom will only tune in bbc have tried all of above but still the same.postcode b61 7lg.

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belinda's 1 post GB flag
belinda's: ...
R
Rob
10:46 PM
London

further to my post, I suspected it may be a case of the signal being too strong, so I picked up a variable attenuator today and that has sorted out all my problems.

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Rob's 3 posts GB flag
Rob's: mapR's Freeview map terrainR's terrain plot wavesR's frequency data R's Freeview Detailed Coverage
Thursday, 7 April 2011
S
serimral
9:24 PM
Peterborough

Live in PE8 6HL. New DM Log Periodic Aerial.
When first tuned picked up all channels. Now recieve no signal messages for ITV1, channel 4 and associated channels on Mux 2. Retuned and lost all Mux 2 channels. Nothing else connected to tv.
How can I rectify this issue?

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serimral's 1 post GB flag
serimral's: mapS's Freeview map terrainS's terrain plot wavesS's frequency data S's Freeview Detailed Coverage
Saturday, 9 April 2011
Briantist
sentiment_very_satisfiedOwner

7:53 AM

Rob: Attenuation is often required. I'm glad to hear you found a solution.

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Briantist's 38,910 posts GB flag
Briantist
sentiment_very_satisfiedOwner

7:59 AM

belinda: I would wait for next Wednesday and see if everything is OK.

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Briantist's 38,910 posts GB flag
Sunday, 10 April 2011
J
JLK
8:51 AM
London

Happiness! After the frustrations of the last three weeks or thereabouts, multiplex 2 has been restored. Fingers crossed everyone else is in the same position and it doesn't happen again...

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JLK's 2 posts GB flag
JLK's: mapJ's Freeview map terrainJ's terrain plot wavesJ's frequency data J's Freeview Detailed Coverage
Monday, 11 April 2011
A
Alan
3:17 PM

Ridge Hill transmitter: when will the hd be turned on as i get 128 chanels but no hd. tv has built in hd reciver.

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Alan's 2 posts GB flag
Briantist
sentiment_very_satisfiedOwner

4:50 PM

Alan: Wednesday 20th April 2011.

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Briantist's 38,910 posts GB flag
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