Help with Freeview, aerials?
Tuesday, 3 April 2012
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MikeW12:26 AM
Bourne
Steve P & jb38: Thank you for your prompt repies. Picture is perfect in between the periods of pixellation & signal loss which last approx. 5 - 10 secs. Problem seems to be present no matter what time of day (or night!)Willing to try masthead amp but multiplex signal strength & quality seems to be strong enough apart from during periods of interference.
jb38: Neighbour across the road does not experience similar problems. Have tried alternative Philips TV, from a bedroom, using same aerial & mains sockets for a couple of hours and some interference experienced but not at the same frequency as the main set- about the same level experienced when connected to its usual log periodic aerial, mounted in the loft & tuned to Belmont (this appeared to be Inversion interference, since only appears during clear air conditions) Main TV not tuned to Belmont by installation engineer due to large horse chestnut tree in sight line from its chimney mounting. I fitted the log periodic aerial. Hope this provides some further detail of problem. Will try radio test tomorrow, if I can find our old multiband transistor radio. Thank you both for your interest & suggestions. What is perplexing me is "what has changed?" Picture quality & stability consistant until late Feb!
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MikeW's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
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jb381:29 PM
MikeW: Thanks for that update / explanation. The problem with reception in the whole of the Bourne to stretching past Morton areas is that signals received from either Waltham (@18mls / 272degrees) or Belmont (@ 39mls / 11 degrees) has to come over a forest at some point along the way, and as such vulnerable to suffering from elements of seasonal variation cause by vegetation (trees) as well as other naturally occurring reasons of an atmospheric nature, and with reception from Waltham being particularly affected by the somewhat closer location (and slight elevation) of the Bourne Woods range.
As far as having noticed a slight difference in the timing of these glitches when using the Philips TV is concerned, I would simply put this down to the fact that no two TV's / boxes have the same sensitivity of tuners, the one with the higher sensitivity always being more resistant to glitches in the signal, although this up to a point is only because as the signal (strength / quality) is running at a higher level it has further to drop before approaching the receivers cut off threshold and causing picture / audio problems.
However that said, you should try a test by observing the signal "quality" (not so much strength) over a few minutes or so to see if it dives up and down, as I suspect that it might be (unless too fast to be observed!) and also have a look outside during the test to see if any tree branches are blowing around, as if they are this can affect reception even if not directly in line between the aerial and the signal source.
With regards to the person across the street not experiencing any problem, this could be because they are positioned to be able to receive a slightly better signal than you are, and this possibly coupled to using a device with a more sensitive tuner such as found in Panasonic ranges. (plus some others of course)
But though, the test for possible interference using the LW/MW radio referred to is important (if only MW tune to 530khz end) as that will instantly reveal any impulse interference in the mains supply and is something which has to be eliminated as a possible reason for your problem, although if none is detected then about the only thing you can try is moving your aerial to a different position in the loft, this meaning in the horizontal plane and preferably done while being able to observe the signals quality changes, as this is more important than the strength and which is almost guaranteed to reveal sizeable variations during any experiments made.
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Tuesday, 10 April 2012
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Bill12:41 AM
I have just bought a new Samsung tv to replace my old Samsung tv... Tuned it in to digital freeview and I'm getting interference on all BBC channels, I never had this problem with the other tv and am using the same aerial. All the other channels seem to be ok.
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Bill: You didn't post a location (ie, a full postcode), so it is hard to be specific.
You may have the Freeview signals: too much of a good thing is bad for you | ukfree.tv - independent free digital TV advice problem.
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Wednesday, 11 April 2012
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MikeW8:38 PM
jb38: Sorry for not responding to your last reply before now but have been away over most of the Easter period. However the situation changed last Tuesday (3rd April)p.m, almost totally in synch' with the change in weather conditions. Away from home Wednesday a.m to Sunday p.m but on return no interference problems experienced thus far. So situation OK for now. If interference returns what is the best longer term solution - different aerial, masthead amp or other? By the way, carried out 'radio test' but did not reveal any 'mains' problem. Many thanks for your informative responses.
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jb3811:49 PM
MikeW: No problem! as I realise that many people are liable to be away at this time. However as far as your interference is concerned there really isnt anything you can do that would help the situation if its caused by atmospheric conditions, but should it happen again make another posting and I will be able to verify if its local to yourself or not, or alternatively you could just enquire across the street to see if they are affected, making sure that they are on the same channel AND station as you, as otherwise whatever is found out will not be accurate.
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Wednesday, 18 April 2012
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john10:01 AM
I live in cm35yx.............i get bbc channels with zero signal strength but no other channels. i did retune a week ago and all was fine. but today the problem started.
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Steve P1:28 PM
John - you are in the London region I think so will have to do a full retune today as the analogue has gone and the digital moved and got more poewerful
Let us know if it works
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John Robert Size10:18 PM
Hemel Hempstead
Steve P:
My computer man retuned my digital tv in the first digital retune and it worked well today when he retuned it all of the channels that derive from Channel 3,Channel 4 and Channel 5 were lost.
I live in HP 1HP
So tomorrow I phone up some local aerial companies even though a few months ago I was told that my TV aerial was good enough.
John Robert Size
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John's: mapJ's Freeview map terrainJ's terrain plot wavesJ's frequency data J's Freeview Detailed Coverage
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Steve P11:27 PM
... UK digital TV reception predictor
JRS - Have you retuned today? You will need to.
Looke as if there are local issues in HH which I do not know. Which are you using? The main CPal, or one of the HH relays, which do not do all multiplexes?
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