Interference to TV reception

 There has been a lot of this and there are three main causes:

  1. 4G mobile phone data transmissions continue to roll out across the coast and these are still affecting TV reception.  Usually a filter fitted to the antenna will fix it but sometimes the amp needs to be changed and or the antennae.
  2. Two way radio interference – there is a huge spike of transmission on the 476 MHz range which is causing overloading of amps and thus digital break up. It is across the whole Coast and the only way to fix it is with filters.
  3. Atmospheric conditions – we thought this was over once we changed to digital but not so – there are still some effects caused by weather patterns. This is a tough one to identify because the fault a) can appear similar to the other two above and b) it is very intermittent (comes and goes) and c) often occurs in the evening when technicians are not available.

Important Note: I have put some extra info up on the website about this but the first step is the system has to be checked by a qualified technician to ensure the other two problems above are not causing or contributing to the problem.


How To Identify The Cause Of The TV Interference

Some tips for you:

This article is specifically to do with the recent spate of TV signal interferences on the Sunshine Coast, QLD.

The first thing you need to know is that the only truly accurate way to check for which of these interferences is causing digital reception problems is the use of a digital meter and testing at the time when the problem is present.

Prior to calling a technician out – the following steps will help narrow down the possible causes:

1. Note the time or times the interference occurs

2. Note the channels that are affected*

*At this point it is important to know the following

a) Is it affecting only one channel or all stations?

b) Is it affecting local channels?

c) Is it affecting Brisbane channels? – Note there is a list below of the channel numbers to help you establish which is local and which is Brisbane if you are unsure.

d) When did the problem first start – how many days or weeks ago?

e) Are there days when it does not play up at all?

3. One of the other things that helps is knowing when you normally view TV – many people only watch in the evening and so report that it plays up at night, but on further investigation we find that the problem also appears during the day as well so one of the important steps is to:-

• Test the TV on the channels you are having trouble with and check these at times you don't normally – eg, early morning, midday or afternoon.

• Just a few minutes will usually be enough or even better sometimes just record something at those times.

With this info to hand you can do some simple deduction of interferences:

1. If all channels are affected and it is every day and at different times of the day and night then it is most likely a TV antenna system fault such as an amplifier or power supply or TV aerial failure.

2. If it is only between 6 and 9m at night and it is where the days are hot and nights are cold then it is most likely atmospheric – although 4G and Two way interference can still contribute to it.

3. If it comes good, goes bad, comes good, goes bad sometimes in a pattern of 15 secs then it is most likely 4G (Mobile Telephone) interference.

4. If it comes good and goes bad and comes good say 20 times over a half hour period or even more random then it is most likely a two way radio interference. (Again 4G can make it seem worse)

5. If it affects just one channel then it is likely the cause is either the first signs of overall weakening TV signal and other channels will gradually follow OR the problem is the TV station and not you. If the fault does not remedy in 24hrs it is more likely the TV antenna.

As a final point – if you suddenly lose all signal on all channels – please resist the urge to retune the TV – this will not fix it, but instead makes it worse because it will delete all your channels from the TV memory.

Instead when this happens:

1. Wait 10 to 15 minutes as minor TV transmission outages will be restored in this time.
2. If in business hours – ring a TV company like ours and ask if your area is experiencing outages.
3. If its not the above things, check that someone has not bumped or unplugged the TV amplifier power pack by mistake (this is sometimes in a another room).
4. If a storm or a nearby lightning strike is involved then organise system to be inspected.

Most often it is a TV transmitter outage which will return in a few minutes.

If you have a situation that does not fit these descriptions and tips then please send an email to This e-mail address is being protected from spambots. You need JavaScript enabled to view it   or call our office on 54791999 and we will research it for you.