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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?
Can I attach a Freeview digibox to a Combi TV/Video unit?1
My high gain aerial can't get all the Freeview channels I expected2
I can't get Freeview yet, when will it start in my area?3
Are there plans to extend the range of regional variations on Freeview?4
How can I Receive Freeview on two TVs using one box?5
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

Comments
Wednesday, 1 November 2017
R
RDD
12:02 AM Stansted

CM24 8DL postcode. Gable end aerial. Wide band, mast head amp. Crystal Palace Transmitter, Mobile masts due south 1 Km Tall trees due south 0.1km
Current aerial need replacement. Normal non HD channels normally good strength (60%).. HD channels poor
However this evening normal channels no signal to very poor. No CP engineering reported .

A) atmospherics??
B) In choosing new aerial , with coming changes 2018, what should I go for ?? Log periodic A ??

Thanks

link to this
RDD's 12 posts GB
RDD's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
MikeP
6:25 PM

RDD:

Looking at the Freeview coverage map and the digitaluk trade pages from the links below your posting, it appears that Crystal Palace is the better option to use.

It could be that some atmospherics are causing problems as a number of people around the country have reported similar to you, but none have had any current engineering work. Ask your neighbours if they are having the same problems, but make sure they are discussing Freeview and not Sky or Freesat via a dish.

As for future-proof aerials, always look at having a good log-periodic type installed. They are not specific to any of the traditional aerial groupings as they are wide band designs. The only consideration for you is whether a 36 element is enough or to go for a higher gain type with more elements. I use a Log36 (see ATV`s Choice Of Aerials for digital TV and it wirks very well. You may need an amplifier in conjunction with it as you already have such a device fitted.

The objective is to have signal strengths of between 50% and 85% for SD channels and between 60% and 85% for HD services. The current Com7 and Com8 multiplexes are due to be phased out from around 2020 and more multiplexes will use DVB-T2 encoding, meaning it will need the use of a Freeview HD TV set (not just an HD Ready one which will not have a DVB-T2 tuner).

Hope that gives some ideas?



link to this
MikeP's 1,659 posts Gold Gold GB
Thursday, 2 November 2017
R
RDD
1:18 PM Stansted

MikeP:
Thanks for the feedback.

Still had problems later that morning, vast majority of channels 0%. Signal matters resolved by a) blank (aerial unplugged) re-tune followed by aerial in retuning both HDTV and DVR. Not sure whether "atmospherics" miraculously righted themselves in the 20 or so minutes taken to carry out the procedures, OR whether something caused the tuning to go out ( aerial/mastehead amp wise) Had checked power supply to masthead amp and was OK.

Anyway sorted for the moment, if anything signal stronger ;).
Re new aerial, will take your suggestion re long log periodic, as it will have far less wind drag factor than the "Chip Pan" Televes wide-band I have at the moment, that has started to fall apart after many years use. The local pigeons appear to use it as a copulation point!!

Will also look out for an LTE version of of the LogP as mobile masts have started to accumulate in some ground nearby ( <1 km)

Thanks again for your help.

link to this
RDD's 12 posts GB
RDD's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
MikeP
11:51 PM

RDD:

Please read Freeview blames air pressure for TV disruption - BBC News whwrw Freeview categorically state that it is due to the high pressure.




link to this
MikeP's 1,659 posts Gold Gold GB
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