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4G filters guide

at800 provides free filters on request to households that experience TV interference from 4G at 800 MHz.

If you require extra filters for multiple TV sets, we will provide these for free. However, if you have more than one Freeview TV in your house, you may have a single aerial and an ‘amplifier’ that sends the signal to different locations. If so, then one filter – fitted between the TV aerial and the amplifier – should resolve any disruption to Freeview on all of the TVs in your home. It is only if you have separate aerials for each of your TVs that you may need additional filters.

Different types of filters

We have at800-approved filters for different situations. A standard domestic filter is smaller than a pack of cards and does not need either batteries or a power supply.

The filters are small boxes that ‘block’ 4G signals at 800 MHz and enable you to carry on watching Freeview as normal. We have tested each type of at800-approved filter to ensure it works correctly in the UK.

If you only have a TV aerial and do not have an amplifier, the filter is fitted between your TV set and the aerial socket.

We think most viewers will be able to fit the domestic at800-approved filter themselves.

If you have an amplifier in your loft, for example, if you have a weak TV signal, the filter needs to be connected between the aerial and the amplifier.

If you have a rooftop aerial amplifier, a weatherproof filter needs to be attached to the mast and connected between the aerial and the masthead amplifier.

Do I need a channel 59 or 60 filter?

Freeview TV services are delivered on different frequencies (commonly known as UHF channels) from transmitters serving where you live in the UK.

4G Spectrum Diagram

One 8 MHz channel is able to carry a number of digital TV stations (for example BBC One, BBC Two, BBC Three etc) combined – or multiplexed – together to use the spectrum most efficiently. In order to receive and watch all channels available on Freeview, viewers need to receive six of these multiplexes. Transmitters across the UK use different sets of UHF frequency blocks to carry the multiplexes. For example, Crystal Palace in London transmits on channels 22, 23, 25, 26, 28 and 30.

If you receive one of your six digital TV multiplexes in UHF channel 60, and experience disruption to your Freeview service, then you will need a channel 60 filter. If you don’t receive any multiplexes in UHF channel 60 then a channel 59 filter should suffice.

To find out what UHF channel you use to receive Freeview, visit the Digital UK website and use the Coverage Checker. Select ‘Detailed view’ to see which TV transmitter you use.

CE marking

DTG Testing provide a conformance testing service for manufacturers wishing to supply at800 filters. The DTG testing service stipulates that filters must be CE compliant. Each product has its own set of compliance information which can be found here.

Brand Product Code / Model Number Consumer
CH59 CH60
Filtronic UK-PSD006-V3-P YES  
UK-PSD008-V5-P   YES
Lynx 14.00551.19.00LM YES  
Labgear F4GA YES  
Televes 404401 YES