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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 UK Free TV

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

  • Freeview reception is perfect or near-perfect most of the time
  • The audio on TV and radio channels mutes momentarily a few times each minute
  • The picture on a Freeview channel freezes a few times each minute

There are two main causes of this type of intermittent interference:
  • 'Induction' interference
  • Mobile phone 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: Maplin: 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.

Help with Freeview, aerials?
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In this section
Official aerial installers guide to the TV spectrum future1
Which free digital TV system will give me the most reliable reception?2
High pressure causing channel loss through "Inversion"3
Digital Region Overlap4
Freeview reception has changed?5
Two frequency interference 6

Wednesday, 19 October 2011
Saturday, 22 October 2011
10:34 PM

Hi Brian, we have a rooftop aerial which I have been told is good. I don't know whether it is pointing towards Malvern or Sutton Coldfield.

I checked the mux channel no's as you suggested (never heard of them before!)... and ITV4 is on Mux Ch55 (Malvern) on the TV, with signal strength/quality 100/99, but Mux Ch 27 (???) on the recorder... (and signal strength 50, quality fluctuating from 44-80)!

BBC1 has been ok but the TV has it on mux Ch53, whereas the recorder has it on 28.

ITV1 (which is the channel I've had LEAST probs with) is on mux Ch57 on both TV and recorder, but all the problem channels are different for TV vs recorder.

Where does Mux Ch27 come from? And 21, 28? Any ideas why on earth my recorder is picking it up?

Thanks ever so much for your help; it seems you might have uncovered the problem...

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Angie's 7 posts GB flag
Angie's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
Sunday, 23 October 2011
Mark Fletcher

1:20 AM

Garry Walker.Tuesday 26 July 2011,11.54 pm.Wembley.Is your aerial horizontally polarised and if so is it directed towards the main Crystal Palace transmitter.If so,your new high-gain group W wideband aerial which you specified is of no use for Crystal Palace as all their multiplexes are on the group A frequencies between ch22 and ch30. (Com7 ch33,com8 ch35 & com9 ch36 at a future date,projected 2013-2016).In poor reception or marginal areas within all group A frequencied transmitters such as Crystal Palace as an example,only group A aerials should be fitted,never a group W wideband aerial as they're somewhat useless on group A frequencies (low signal gain being commonplace).If you can afford it,ditch or keep to one side the so-called group W wideband that you have and get a group A aerial,either a Yagi 18A or XB16A installed either on its own or diplex what i suggested above a group A antenna with the group W wideband antenna that you have.Just one reminder there is no such thing as a high gain group W wideband aerial,and not really recommended for use on all group A transmitters in a poor reception or marginal area such as Crystal Palace and Caradon Hill being prime examples !

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Mark Fletcher's 673 posts GB flag
Tuesday, 25 October 2011
9:54 AM

PS Presumably I should therefore set all the channels to receive from Malvern? If so, is there a list of all the Malvern mux channel no's?
Thanks again!

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Angie's 7 posts GB flag
Angie's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage

12:02 PM

Angie: ITV4 etc on Mux Ch27 is from Ridge Hill @ 14 miles away, as are Ch's21 & 28.

If you receive Malvern best then the Mux Channels used are Ch53(BBC1) - 57(ITV1) - Ch60(HD service) - Ch50(SDN) - Ch59(ArqA) - Ch55(ArqB)

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jb38's 7,179 posts GB flag
8:14 PM

hi my freeview box has suddely decided to freeze how can this be resolved thanks
its an hitachi

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audrey's 1 post GB flag
Wednesday, 26 October 2011
Mark Fletcher

12:23 AM

audrey.To unfreeze your "frozen" box simply plug it out for 10 seconds then replug back in,it should hopefully reboot itself !

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Mark Fletcher's 673 posts GB flag
Mark's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
Friday, 28 October 2011
J Tayor
8:19 PM

phil w:

I also live in the BS22 area and receive from the Mendip transmitter, the reception is rubbish, have tried everything to no avail, Ive been told to use a ferrite aerial or ferrite beads on the aerial lead!!!

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J Tayor's 1 post GB flag
J's: mapJ's Freeview map terrainJ's terrain plot wavesJ's frequency data J's Freeview Detailed Coverage
Saturday, 29 October 2011
11:56 AM

I just wanted to say THANK YOU for this great service that you provide.
My digital recorder is now receiving all channels from Malvern, and everything seems fine!
Without your help we would have been very unhappy with digital; even Sony didn't come up with the right solution for the reception problem - they just had me running various updates and fixes, with no mention of mux channels!

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Angie's 7 posts GB flag
Angie's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
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