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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?
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

Thursday, 6 February 2020
Dave Bates
6:45 PM

Hi (posting this again as first attempt disappeared !)
It's about BBC4 HD. Fine until the December retune, took 6 attempts over several days to finally get it tuned but after that could rarely receive it (only on stormy days). It was apparently only outputting at 5 KW from a "local" transmitter whatever that means.
After the retune of yesterday can't tune it again (channel 56 754 Mhz 51,200 Watts on Com8)
Emley Moor transmitter. I use a horizontal "oldish" loft aerial.

Is there any mileage in buying a new aerial ?
Postcode LS5 3NW

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Dave Bates's 2 posts GB

7:26 PM

Dave Bates:

Your other post hasn't disappeared, it's there on the Emley Moor transmitter page. As you've provided a postcode, I'll answer it over there. Not sure where this "It was apparently only outputting at 5 KW from a "local" transmitter" came from, virtually all Local transmitters & Relays do not transmit COMs 7&8 at all, Sheffield is the only one locally that did and COMs7&8 there have now closed since the muxes at Emley have now moved to their final channels C55 & C56.

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Chris.SE's 1,118 posts GB
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