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Single frequency interference
Brian Butterworth published on UK Free TV
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 interferenceLocal analogue interference is caused by household video devices that you can attach to a television such as:
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 areasIn 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?
Thursday, 28 December 2017
Thursday, 8 March 2018
In the evenings I get interference from planes, motorbikes and the Docklands Light Railway and these vary at times. This hasn't always been the case but started about three months ago. My postcode is E14 0EF (Poplar transmitter) Apartment block with communal aerial
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Lesley's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
Friday, 9 March 2018
Are you sure you are getting your signals from the Poplar Freeview Light transmitter? The information at Coverage Checker - Detailed View (the digitaluk trade link below your posting) shows you should get excellent reception from Crystal Palace and have the benefit of a Full Freeview service rather than the 'light' service from Poplar transmitter.
Check which channels your TV has tuned to, your User Manual will tell you how to find that as it's usually on the manual tuning page - but *do not* retune as yet. Crystal Palace currently uses channels 22, 23, 25, 26, 28, 30, 33 and 35. Changes are expected on 21st March 2018, mainly affecting COMs 7 & 8 which move from channel 33 and 35 up to channel 55 and 56. Poplar transmitter currently uses 39, 42 and 45 and these will not change yet.
Check which direction your aerial is pointing. For Crystal Palace it should be aimed at 204 degrees (a little west of south) and for Poplar it should be at 1 degree (roughly north).
Crystal Palace will need use of a wide band aerial, either a log-periodic or a Group T one (it used to need a Group A aerial which will not be any use for COMs 7 & 8 reception) and be mounted with the small bars horizontal. Poplar needs a Group B aerial with the small bars mounted vertical.
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