[Just] fifteen households in the test area reported problems with TV reception caused by 4G. Before the test, at800's forecasting model predicted 120 households would be affected.
Approximately 22,000 homes surrounding the 4G at 800 MHz masts were sent information in advance of the testing asking them to contact at800 directly if they experienced problems with Freeview. Over 100 calls were logged by at800 from these households. Professional aerial installers, as well as TV signal experts from at800, the BBC and Ofcom, visited locations that reported problems to verify their cause.
All issues that could be attributed to 4G at 800 MHz were in television systems with signal amplifiers, either in communal blocks or domestic installations where the amplifier was attached to the aerial. A filter that blocks 4G signals at 800 MHz resolved problems seen by viewers when installed between aerial and amplifier.
Simon Beresford-Wylie, chief executive of at800, said "This was a useful, small-scale, test. We'll now improve our forecast model and look at the approach we use to tackle the issues we've seen. Further extensive evaluation will occur during April and May as masts are switched on for tests across larger urban areas."
at800's preparations for the commercial rollout of 4G at 800 MHz continue with a second phase of testing. These will focus on urban areas covering a larger number of addresses. at800 expects to be able to announce plans for a second test soon.
I note that the test mentioned was in an urban area that has several hills. Do you know if any such tests are planned in remoter rural areas where DTV signal strengths will inevitably be weaker and perhaps more susceptible to interference.
Interesting the Aerial Amplifiers were in use, perhaps it is the non-linearity in those that accentuates the RF interference?
Putting the filter before the AeAmp is the only way to do it.
If 4G mobile signals can disrupt TV programmes on channel 60 then is it possible that 4G signals can be disrupted themselves by the channel 60 TV transmissions?
After all, Tv signals are more powerful and adjacent channel interference can work both ways.
We have had problems with our reception since Fiday. Our reception is intermitent with the signal dropping to 'weak signal', or periods of 'no signal'.
Oddly another set in another room seems to be unaffected (though we watch this far less so may not have noticed).
We live in Crewe.
Any suggestions ? - we,ve tried retuning etc.
John Jacobs question. Since the set in the other room is OK then that rules out transmitter problems.
Have you checked the aerial connection behind the set to see if it's the source of the problem and then plug in the other set on the same aerial to see if it's your main TV that's at fault.
If the second Tv works Ok on that main aerial then it's likely that you main TV set is at fault.
Neville Langley: If the two aerials are linked together via a diplexer it is possible that you could have lost ArqA from Winter Hill on C49. This depends on where the frequency split occurs on the two legs of the diplexer. You should not, however, have noticed any difference with regard to ArqB as this continues to be transmitted on C55 from Winter Hill, so channels 18,19 (4music and Yesterday) should still be available.