Freeview reception has changed?
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?
Monday, 31 January 2011
J
jb389:52 PM
Braintist: Sorry but didnt notice you had replied as it was above the border on my screen.
link to this comment |
jb38: Don't worry, I've replied to 82 comments today, I'm a bit answered out.
link to this comment |
Wednesday, 2 February 2011
sue blunt: Have you checked everything listed at the top of the page?
link to this comment |
Thursday, 3 February 2011
L
Lynn7:51 PM
Hi I have lost all the multiplex A channels on my STB, I have another STB and can pick up all channels available. This suggests to me the first STB has developed a fault, however the manufacturer says has had it back says ther is nothing wrong with the box and I need to change my aerial. Could there be any other reason why one box picks up all channels and the other doesn't.
link to this comment |
Sunday, 6 February 2011
M
Mary4:01 PM
Hi, I'm living in the Central Liverpool area and lost all the channels last night. I've check all the things listed above and they look fine to me. The only two things I can think of are (1) the strong wind last night , but our aerial is not outside; and (2) the big crane opposite the road, but it has been there for couple of weeks and never causes problems to our DTV. I am bit confused now...Could anyone advise where or who I can ask help for please? Thanks very much.
link to this comment |
Tuesday, 8 February 2011
D
Donald Campbell11:53 AM
Bought HD TV at time of changeover, and also a box for one other TV, and reception on both was excellent with reception of all channels. From about 2 weeks ago I get no reception on either and get a message "No Signal". Channel search does not come up with any channels. Aerial, connections, etc., have not been touched and have unobstructed line to Durris. DigitalTV say I should have a strong signal. What has happened?
link to this comment |
Donald Campbell: I would suppose that something has failed, it could be the receiver (but unlikey as you say it effects two devices) or you have a fault in a component of your aerial system.
The transmitter is operating normally.
link to this comment |
Sunday, 13 February 2011
S
Stephanie10:55 AM
Hello, I have a Technika TV with built in freeview which has worked fine for a couple of years but recently has lost all the digital signals. Still receives analogue, altough not C5. We unplugged the TV & plugged into our downstairs ariel (which our main tv receives freeview from) and it couldn't receive digital signals there either. We're very tempted to just buy another TV but not entirely sure if it's the TV at fault or not.
link to this comment |
Select more comments
Your comment please