Single frequency interference
There are several different type of interference that cause problems. This page deals with the situation where:
- Freeview reception is perfect or near-perfect most of the time
- Several channels are missing, but they are all on the same 'multiplex'
Local analogue interference
Local analogue interference is caused by household video devices that you can attach to a television such as: 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?
Tuesday, 22 February 2011
JOHN NEWMAN: The Great Missenden transmitter will not have any digital services until 2012.
I would have a look at the Freeview reception has changed? | ukfree.tv - independent free digital TV advice page for more things to check.
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Sunday, 27 February 2011
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jen4:20 PM
Cardiff
i live in a high signal area in cardiff. i have a small tv upstairs with inbuilt freeview which picks up all channels with a cheap aerial. i have a 42inch bush tv with inbuilt freeview downstairs which will pick up only a few channels with the same aerial. ive tried 2 other amplified aerial on this tv (one supposedly the best that maplins carry)but no joy in getting the channels. any suggestions?
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jen's: mapJ's Freeview map terrainJ's terrain plot wavesJ's frequency data J's Freeview Detailed Coverage
Monday, 28 February 2011
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Jon8:50 PM
can some please help? Just got my first flat screen tv a Silvercrest and looks grate,but I have set it all up and it seems that I do not get all the freview channels I have a roof aerial, but all the ones I do get are very good picture how do I gettthe missing channels/
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Kate9:34 PM
If I've established that I have single frequency interference (which it seems I have) what do I do about it? I live in the Notts area (NG21).
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Jennifer Whitehead10:50 PM
Market Harborough
Please help, i have a sanyo tv with freeview inbuilt and at about 6pm this evening lost all signal. Still no signal, i've tried another lead for aerial, also an indoor aerial and still no signal. I've tried to re-install channels, with no luck and can only get analogue with very bad reception. I live in Market Harborough (le16).
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Jennifer's: mapJ's Freeview map terrainJ's terrain plot wavesJ's frequency data J's Freeview Detailed Coverage
Tuesday, 1 March 2011
Kate: You disconnect whatever it is that is causing the problem.
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Jennifer Whitehead: Please see the Freeview reception has changed? | ukfree.tv - independent free digital TV advice page.
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Thursday, 3 March 2011
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Julian3:44 PM
Daventry
Help, I had an aerial upgrade completed by a professional 5 years ago to enable me to pick up a signal from the Oxford transmitter. This worked fine with occasional loss of signal due to atmospherics until just after Christmas. Since then I have been unable to get ITV 1, C4, C5 etc. The aerial has a booster device on it, but this seems to be working OK. I have re-tuned my set top box following your instructions on single frequency and multiple frequency problems but to no avail. My postcode is NN11 3RA. Any suggestions?
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Julian's: mapJ's Freeview map terrainJ's terrain plot wavesJ's frequency data J's Freeview Detailed Coverage
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