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Expecting 4G interference? Tests now show that you have a one in 300 chance

Remember the scare stories in the papers? Millions of homes will have problems when 4G starts... Even the Ofcom figures suggested 760,000 homes would have problems. The 4G tests suggest the just 90,000 homes will need to fit a filter.

Remember the scare stories in the papers?  Millions of homes wi
published on UK Free TV

Looking back the the original posting, Ofcom moves to protect Freeview interference from 4G mobile, we can see the Ofcom suggested that:

Of the 16.3 million UK homes with a standard (unamplified, unshared) Freeview reception, 110,000 (0.67%) would be effected.

Of the 5.2 million homes using communal aerials systems, 550,000 (10.6%) will have problems.

Of the 5.6 million homes using amplified Freeview reception, 100,000 (1.8%) will experience problems.

Today, at800 have published the results of the tests in London, Brighton and Hove and York - at800 updates estimate of likely impact of 4G at 800 MHz on Freeview:

"Following tests conducted across the country, at800, the organisation responsible for protecting Freeview when 4G at 800 MHz is rolled out across the UK, has provided a new estimate of the likely scale of the impact. If national rollout reflects the results seen during its tests, at800 expects no more than 90,000 households, with Freeview as their primary TV service, to experience disruption caused by 4G at 800 MHz. Whatever the level of disruption, at800 is ready to restore Freeview to viewers.

at800 has now sent postcards to households in London and the surrounding areas in preparation for the activation of 4G at 800 MHz masts over the coming weeks and months. at800 is also sending postcards to other areas of the UK ahead of masts switching on. at800’s mailing does not mean that 4G services will be available to consumers. For information about the availability of 4G services, people should contact their mobile operators.

In London, in particular, Freeview received from the Crystal Palace transmitter is unlikely to be affected by mast activation because of the strong terrestrial television signal and its relatively large frequency separation from 4G at 800 MHz. However, at800 is sending postcards and running a publicity campaign to ensure anyone who does experience new disruption to their Freeview service knows how to get in touch."

So with 26.50 million TV households in the UK (see Monthly universe summary - BARB) 90,000 represents 0.340% of them - that's a ONE IN THREE HUNDRED chance.

It seems that you are most likely to need a filter if:

a) you are a long way from a high power Freeview transmitter; and

b) you are very close to a 4G mobile phone mast; and

c) you are using a booster.

That's good news for Freeview viewers.

If you have had a postcode from at800 - see Received a postcard from at800?

Help with TV/radio stations?
Can I receive British Eurosport for free?1
Can I receive DAB radio too?2
Can I get E4 with this service?3
Is sky|one going on Freeview?4
Can I watch for free Financial channels such as CNBC or Bloomberg?5
In this section
Ofcom announces 700 MHz clearance schedule 2017-201
When will I get a new Freeview aerial because of even more mobile broadband? 2
Do not forget that 4G starting soon in 20 cities and towns really soon3
Using UHF channels C61 to C69? Time to retune4
Two final Freeview retunes in Scotland on 24 and 31 July 20135
800MHz band cleared by Digital UK - ready for nationwide 4G use6

Wednesday, 1 January 2014
Dave Lindsay

10:55 PM

Marion: Where is your aerial point?

If it is directed to the main transmitter at Llandona then be aware that the Caergybi (Holyhead) transmitter is but a stonesthrow away at the fire station.

Particularly as Caergybi uses lower frequencies than Llandona then your receiver could have chosen to use it. Most receivers give information on the signal strength screen as to which signal it is tuned to. Use this to identify whether it is tuned correctly or not.

"If" your aerial points to Llandona then check that BBC One is tuned to UHF channel 57 (762MHz). Caergybi broadcasts BBC on UHF channel 21 (474MHz).

If it's tuned incorrectly to Caergybi then just have the aerial lead out for the first 30% of the scan so it isn't in during scanning of its frequencies.

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Dave Lindsay's 5,724 posts GB
melanie loveridge
11:44 PM

Hi, my brother has lost his signal completely ever since Christmas eve. He knows its not his aerial as he has checked it for lose wires etc, its definitely the signal. He lives in Marlow, bucks, the signal is supposed to come from Chrystal palace. Can you tell me please whether there is a problem there?

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melanie loveridge's 3 posts GB
Thursday, 2 January 2014
8:47 AM

Terrible picture breakup except perfect picture BBC1 8pm to 10pm. Very curious. Is something happening or not happening at this time?

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Ann's 1 post GB
Chris Stanford
11:43 AM

Have lost BBC News HD and.BBC 4 HD and some other HD channels from Crystal Palace. Message reads "Weak or no Signal"

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Chris Stanford's 2 posts GB
Dave Lindsay

1:54 PM

Chris Stanford: The new HD multiplex is on lower power than the rest, so perhaps your reception is marginal (touch-and-go). If your receiver has a built-in booster it might be worth turning it on for these services.

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Dave Lindsay's 5,724 posts GB

8:25 PM

melanie loveridge: How does he know its not his aerial?

If you'd included a postcode, you could have checked via R & T yourself - but there seems no problem with the Marlow light transmitter, and as for Crystal Palace,it serves about 4.5 million homes, so you'd know if there was a serious problem .

Since the transmitters seem fine (and he should ask his neighbours if they are having any problems), it has to be within his own setup.

Looking back through other, similar questions, most people either disappear, or find a problem with the wiring, connections, etc. Since we've just had very high winds, etc, its pretty likely that something has broken or corroded. Even if the aerial is in a loft, it does not mean that corrosion cannot take place, and if he has booster thats powered, that can fail as well.

He needs to check again, and eliminate each possible problem.

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MikeB's 2,577 posts GB

8:29 PM

Ann: which transmitter are you using, and what is your signal strength? You coverage is indicated as good for Rosneath VP (8km), Ardnadam (1km!) and even Black Hill (67km).

If your getting really high strength, then the signal can break up, and and also if its far too low. The really strange thing is the time its perfect - is this the same every night?

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MikeB's 2,577 posts GB
10:20 PM

Thanks yes he checked all the connections, and sometimes it comes up really clear at about 11 at night! And yes I did do the postcode check and it said it was fine, but it still isn't working. I will tell him to check again, thanks for your help.

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melanie's 3 posts GB
Thursday, 9 January 2014
Chris Stanford
9:34 AM

Hi all, it was a new 4G transmitter. Filter installed, now everything fine. Chris Stanford:

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Chris Stanford's 2 posts US
Friday, 10 January 2014
Jack Luxon

7:27 AM

Chris Stanford.
I have come across this website Sitefinder Mobile Phone Base Station Database
which indicates where mobile phone masts are located. Unfortunately it doesn't mention anything about 4G, probably because we don't have it around here. Can you please use the link at your location to discover if your 'new' 4G transmitter is mentioned and refers to 4G?

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Jack Luxon's 33 posts GB
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