menuMENU    UK Free TV logo Freeview

 

 

Click to see updates

Freeview reception has changed?

Why should my Freeview reception change when I have not changed anything?

Why should my Freeview reception change when I have not changed
published on UK Free TV

From time to time people find that their Freeview box, integrated set (idTV) or Personal Video Recorder (PVR) has lost many channels without any apparent changes.

There are a number of factors to consider

Freeview is broadcast on digital multiplexes. This means that, once broken down into a stream of bits, each television channel is combined into a single transmission of 1s and 0s. This means that reception is of the multiplex first if this is lost it affects all the channels in the multiplex in the same way.



The signal strength received by the box or TV for a particular multiplex from a given transmitter determines if the data can be received or not. So, a poor signal results in no data, an adequate signal in perfect data and a low signal in either none or all.

Poor digital signal levels do not result, as they do with old-fashioned analogue television, in a sub-standard picture or sound. Poor signals often result in a perfect data-stream, but are prone to periods of no reception. Sometimes this will be for hours, but can also be several times a minute when caused by induction from fridges, freezers, central heating systems, two-stroke scooters, baby monitors and so on.

If you have lost ALL your Freeview channels

First disconnect the aerial lead from the Freeview box or TV set and reconnect it and then follow this reset procedure to scan for channels again. If this does not result in services being restored, check the Freeview transmitters page to see if there are any engineering problems with your local transmitter.

How to check all cables, connectors and aerials

The RF connectors need to be in very good condition to work. There are two general types:

Factory-fitted connectors are very reliable as they cannot easily be taken apart, but they can be damaged by wear and tear. On the female-type the central section is often composed of two parts which can often be forced apart, resulting in a poor connection you can push them back together if this has happened with a pair of tweezers. On male connectors if the central pin is damaged, you will need a new cable. If there are any loose partials in the connector, remove them.

Another problem with these cables is that quite easy to sprain the connector at the back which causes little obvious external damage, but disconnects the internal connection. This happens often when a set-top box is pushed backwards into a cabinet.

Hand made cables can also suffer from similar problems to factory made ones and they are also prone to accidental damage from a cable being pulled. If such a connector is not firmly attached to the cable, the connector may need refitting.

Cables

Make a visual check of the cables. There are a few basic checks:

If the cable has been slashed or cut, it will not be very effective or reliable. If such a cable is fitted externally, this can allow rainwater to enter the cable and this will reduce the signal levels.

You can easily damage an RF cable by crushing it, for example in a door. If the outside of the cable has a permanent kink in the cable or has been very tightly looped, this could be the site of damage.

Aerial

For reliable and effective Freeview reception, a rooftop aerial is required. It is hard to make a visual check of such an aerial without putting yourself in potential danger.

You can make a visual check of the route between the aerial and the transmitter. Any form of obstruction will damage the digital signals. In particular trees coming into leaf, as these will leech the signal before it reaches your aerial. This applies to both trees adjacent to the aerial and at a distance.

Another common problem in cities is building work. A large crane will often change position many times during the day, and if this is between your aerial and the transmitter this can reduce the signal levels in an unpredictable way.

If your system uses a booster, the power may have failed. Check the fuse to the power to the booster.

Weather problems

There are two main weather problems that effect Freeview reception.

The Inversion Effect: please see What is the Inversion Effect and why does it effect my Freeview TV reception?



Wind: high winds sometime can dislodge the aerial this results in a poor signal.

Rain: poor or old cables can fill with water and this results in a poor signal. If this happens, the cables will require replacement.

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
Two frequency interference 5
Single frequency interference6

Comments
Sunday, 31 December 2017
M
MikeB
sentiment_very_satisfiedPlatinum

7:01 PM

Paul Davies: Your DVD is just a player, and netflix etc are via the web, so they have no connection with your TV signal.

'Resetting Freeview' is just retuning the TV, or returninng the TV to its 'factory/initial setup' state which can be done via the menu. However, you need to discover why your TV signal is breaking up, since Mendip should give you a perfectly fine signal.

Check which transmitter the TV is tuned into, and then note signal strength - it could have locked onto a transmitter much further away. You should be able to manually tune from the setup menu, and you should look for Channel 45, etc on that to use Mendip.

If the signal is weak and your looking at the correct transmitter, check your cabling, because that a primae reason for a problem.

Use Mendip - Digital UK reckons you should get a good signal, and you'll get the full range of channels. Wenvoe seems even better, but there seems to be something on the signal path pretty close to you. Look at which way your aerial and everyone else's is pointing - which one is it?

link to this comment
MikeB's 2,577 posts GB
Friday, 9 February 2018
J
JL
6:06 PM

Hi,
I wonder if you can offer advice. After months of perfect clarity, our freeview HD channels have started getting small black outs and pixelation out of the blue. This has been going on for about a month. We have a standard YouView box purchased from John Lewis. We have a very high signal (Strength 91% / Quality 100%) which I believe we get from Crystal Palace (we're near Epping). After googling the issues I purchased a variable attentuator and have tried various strengths which hasn't fixed the issue (what is optimum for a YV box?). I've swapped cables, checked connections and re-tuned with no luck. We are in a shared block so we can't access the building's aerial, but I haven't heard anything from the neighbours about anyone else having any issues. I also don't think it is 4G as the 4G signal in our area is pretty poor - unless poor 4G can affect freeview HD? I've discounted the weather as it's been going on for a while and the disruption is now constant on all the HD channels.

Does anyone know of any changes to Crystal Palace which may have affected this? Or is anyone having recent, similar issues? Or has any other possible causes? I'm loathed to do a factory reset as we'll lose all of our recordings, but I guess this would be a last resort before returning the box. After endless googling I'm kind of out of ideas so any advice or help would be great!

Thanks very much, J

link to this comment
JL's 1 post US
M
MikeB
sentiment_very_satisfiedPlatinum

10:31 PM

JL: We could do with a postcode, but yes, 91% on a Humax Youview PVR will cause the signal to break up.

Nothing particularly will have changed at the transmitter - its more likely that the PVR was pretty much on the threshold of being overloaded, and just a very slight rise in signal strength has pushed it over the edge. They are known to have sensitive tuners, as my collegues at Oxford Street would probably agree (our techincal support guys certainly have), and thus people do think there is something wrong with them sometimes. Actually they are just working a little too well.

Attenutaors are the way to go, but I know what you mean about variable ones - they didn't work for me either. I bought a number of these: 6dB Coax Plug Inline ATTENUATOR: Amazon.co.uk: Electronics

I bought them from that seller, and got a 3db, a 6db, 9db, etc. They can be used by themselves (just get another aerial cable so that you can put a cable from the wall, then the attentuator, and then a cable to the back of the box, so that there is no weight on any socket), but if the signal is still too high, then you can either use a more powerful one, or fit one to another, putting them in series. So if a 6 isn't enough, you can add a 3db, etc.

If you look at the page 'too much of a good thing' on this site, it will tell you the optimal signal strength, but 75% is pretty much perfect.

link to this comment
MikeB's 2,577 posts GB
Saturday, 17 March 2018
T
Time Hote
6:47 PM

3 mux's have stopped working, LB, com 7 and com 8 and so cannot view the channels. The channels appear in the guide.
They have zero strength, not only on my Humax PVR, but on Hitachi HD ready and on a neighbours Bush HD tv.
They worked before the last re-tune on March7th.
Anyone else have this problem or know the reason please?

link to this comment
Time Hote's 1 post GB
Sunday, 18 March 2018
MikeP
sentiment_very_satisfiedPlatinum

11:17 AM

Tim Hote:

To get any meaningful response or help you need to provide a full post code so that we and others can see what transmitter you are using and what the reception conditions are like. In some areas, the change of channels used for COMs 7 & 8 require a change of aerial, but that depends on where you are.



link to this comment
MikeP's 3,013 posts GB
Monday, 26 March 2018
S
Stephen Curtis
4:23 PM

we have lost 10 channels after being told to retune ,we evidently used to receive these from Brighton , the Newhaven Transmitter now does not do this anymore , We have been told they have freed up space for mobiles . Is this true? if so it means we can not watch programmes on drama , ITV3 , Yesterday & Quest , That We like , Can we please have our channels back .

link to this comment
Stephen Curtis's 1 post GB
M
MikeB
sentiment_very_satisfiedPlatinum

8:04 PM

Stephen Curtis : Your channels havn't gone - either you've tuned into the wrong transmitter, or your aerial cannot pick up those particular frequencies. If its the latter, then you might get that replaced free of charge.

link to this comment
MikeB's 2,577 posts GB
S
StevensOnln1
sentiment_very_satisfiedPlatinum

11:30 PM

Stephen Curtis : The Newhave transmitter has never broadcast the channels you mention, so you must have been picking them up from another transmitter. Please provide a full postcode so that we can see your predicted coverage and offer further advice.

link to this comment
StevensOnln1's 2,683 posts GB
Tuesday, 27 March 2018
R
Richard Hewlett
10:07 AM

I have returned from holiday and found on channels available and was told that our transmitter had changed and I needed to retune my tv,s. I have done this but on one tv I can only get HD channels with no signal for the others and also a lot of channels missing . On the other set I have got a reduced number of non HD channels but with a lot of picture break up and no HD channels . I have an arial on the roof . My postcode is GL544LW . Can you help ?
Thanks Richard

link to this comment
Richard Hewlett's 1 post GB
S
StevensOnln1
sentiment_very_satisfiedPlatinum

11:09 AM

Richard Hewlett: The Andoversford transmitter changed frequencies on 5th March. You may require a new wideband aerial, which you should be able to arrange free of charge if you don't have satellite or cable by contacting the Freeview Advice Line (see link below).

Important changes to Freeview TV signals | Freeview

link to this comment
StevensOnln1's 2,683 posts GB
Select more comments

Your comment please
Please post a question, answer or commentUK Free TV is here to help people. If you are rude or disrespectful all of your posts will be deleted and you will be banned.







Privacy policy: UK Free Privacy policy.