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Freeview intermittent interference

When you get occasional sound loss or picture freezes

When you get occasional sound loss or picture freezes
Published on by on UK Free TV

There are several different types of interference that cause problems. This page deals with the situation where:



There are two main causes of this type of intermittent interference:

Induction interference

Induction interference is caused by mains-powered household devices that contain a large motor, such as:
  • Washing machine;
  • Tumble dryer;
  • Central heating pump or combination boiler;
  • Fridge;
  • Freezer;
  • Power tools (drills, jigsaws etc)
  • Vacuum cleaners;
  • Water pumps;
  • Automatic doors


You can identify if one or more of these devices is causing the Freeview reception problem by powering off the devices.

If one of these devices is causing the problem, then the reception problem can usually be solved by using a mains filter device and use it on the Freeview boxes mains connection.



Such as device is this: <img src="data:image/png;base64,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" class="xico" style="vertical-align:text-bottom" alt="www.maplin.co.uk link icon"> link iconMaplin: 6-Way Flat Screen and HDTV Surge Protector and Mains Filter.

Mobile phone interference

If you keep a mobile phone by your Freeview box or digital television, keep it further away!

This also applies to other transmitters such as baby monitors, video senders, walkie talkies, and portable phones.





Your comments: most recent posts are at the bottom

firstFirst comments prevEarlier comments  ◊ 

Your comments are always welcome. Please use the form below to add your thoughts or questions to this page. We will get back to you as soon as we can.

M
MikeB
Wednesday 19 November 2014 10:27PM

Kevin Ross: Your about 25km from Black Hill, so not that far. Have a look at the signal strength...

link to this
K
Kevin Ross
Wednesday 19 November 2014 11:08PM Glasgow

Hi mike. Thanks. But my signal strength is 70-76% for most channels with the HD oNes all being 76 so too strong a signal would not seem to be the problem especially as my problem only started 4 weeks ago. Any other suggestions?

link to this
Dave Lindsay
Thursday 20 November 2014 12:30AM

Kevin Ross: Have you checked that you are tuned to Black Hill rather than Darvel, assuming your aerial points to it? Darvel's channels are lower down and will therefore be picked up before Black Hill's.

Darvel

BBC One = C22
STV = C25
BBC One HD = C28
ITV3 = C23
Pick = C26
4Music = C29

Black Hill's six channels are 46, 43, 40(HD), 41, 44 ,47

link to this
K
Kevin Ross
Thursday 20 November 2014 6:43PM Glasgow

Dave. Can I choose which transmitter I can pick UK? It's a communal aerial. Also, it's a problem that's only just started 3 weeks ago and almost always only on hd channels and very rarely SD

link to this
Dave Lindsay
Thursday 20 November 2014 8:28PM

Kevin Ross: The UHF channel numbers I gave above are normally given on the signal strength screen. Confirm that those of Black Hill are tuned rather than those of Darvel.(I assume here that your aerial points to Black Hill which is due east.)

If you find that it is tuned incorrectly then you need to retune, either by:

- clearing what's already stored and manually tuning the five (six if it's HD) channels, or;
- having the aerial unplugged for the first portion of the scan where Darvel's channels are scanned.is one way to avoid it. Plug in at 30% or once it's scanned UHF channel 30 if it gives channel numbers.

However, this only need be done if it's tuned incorrectly.


Communal aerial systems are often filtered so as to only allow through from the aerial the frequencies used by the designated transmitter. Therefore, under such circumstances it's not possible to pick up the "wrong" transmitter.


Any 4G 800MHz filter should be fitted before any signal amplifer/booster as the 4G signal can overload it. As it's a communal system then it will have an amplifier and so fitting the filter in your dwelling won't stop the 4G signal from going through the amp.

See if others in the block have the same issue. The fact that they don't doesn't necessarily mean that it isn't an aerial system problem but the fact that you have been provided with a 4G filter suggests that your address could be expected to issues. In which case you need to contact the party responsible for the aerial system to get it put right.

You will not need a filter adjacent to your TV/box as the system will be filtered, so it will serve no purpose.

My advice would be to keep it. at800 (the organisation giving out these filters) is only giving one per address. If you know someone who needs two you might like to donate your unwanted one, rather than throwing it in the bin.

link to this
K
Kevin Ross
Thursday 20 November 2014 10:15PM Glasgow

Thanks Dave. My tv and youview box are tuned into black hill but when I check the quality of signal on hd channels the bar fluctuates wildly! What do you think is the cause?

link to this
Dave Lindsay
Friday 21 November 2014 12:02AM

Kevin Ross: Try a different lead from wall socket to Youview box. If the problem remains then it rather points to the issue being with the signal that is coming out of the wall socket, in which case it doesn't actually matter what the issue is as it's not your job to fix it - you simply report it to the responsible party.

But the fact that the 4G filter arrived and that the signal is poor suggests that it could be a 4G signal overloading the amplifier, which needs an engineer sort it.

link to this
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