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42 posts

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Topic # 56337 13-Jan-2010 23:58
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I have recently bought a Sony Bravia KDL46V5500, which has a integrated freeview tuner built-in.
I am currently able to receive TV1, TV2, TVNZ6, TVNZ7 in digital format clearly, without the signal breaking. These channels have a constant "High" rating on the signal level (which is full bar, with the green colour at the end) showing in the 'system information' menu of my TV.


However, I cannot recieve TV3, C4, and Prime in a clear, un-interupted signal like the channels listed before. These channels seem to fluctuate a lot in signal level ("low" to "good", orange to yellow region), and at the moment from two days worth of analysis, the signal seems to drop to an unwatchable at mid day, and sit at bearable watching levels at late night.
Is it heard of for signals to fluctuate due to the time of the day, if so what are the causes and remedies?


My UHF Aerial is pointing SSW ish while 2 of my my neighbour's aerial seems to be aiming SWW ish, almost a 20° difference. I live Howick (more specifically, Somerville), Auckland (I am close enough to Somerville Intermediate School that you can assume I reside there, for map referencing), and I am considering calling an Aerial Installer to take a look at it. My house is also relatively new (built late 1995).


Pictures of the direction my aerial is pointing at can be produced and uploaded upon request.

I've read a few guides and such, and it seems like I'm getting really good CH 29 reception (TVNZ), but a relatively weak CH 33 reception (Mediaworks), and absolutely no CH 45 reception (for SKY/Prime?)




Thank you to anyone who helps me with my dilemma in advance, most of the programs and movies I want to watch are generally on TV 3 =[.

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50 posts

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  Reply # 289853 14-Jan-2010 02:38
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Darquel:
Is it heard of for signals to fluctuate due to the time of the day, if so what are the causes and remedies?

My UHF Aerial is pointing SSW ish while 2 of my my neighbour's aerial seems to be aiming SWW ish, almost a 20° difference.


Hi Darquel,

It is quite common for the UHF signal (both analogue and digital) to fluctuate considerably depending on the climatic conditions (eg: fine or raining - wind blowing the trees, etc) but when the signal raises or lowers at certain times of the day, (usually from weak in the middle of a summer day to stronger at night), that's normally attributed to the raising and lowering, or thinning and thickening, of the ionosphere . That's the layer in the atmosphere which reflects radio and TV signals back down to the Earth. When it's higher or thinner less signal gets reflected back down.

However the differences are usually only really noticable when you are a long way (30+Kms?) from the transmitter and affect all the signals!

I suspect that your problem is mainly attributed to the directioning of your aerial; - 20 degrees is a long way out for a UHF aerial and aerial alignment can affect some channels more than others. Try moving your aerial closer to the direction your neighbours' aerials are facing or get an installer to check the alignment for you.

Cheers,  Wild Bill



42 posts

Geek
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  Reply # 289854 14-Jan-2010 02:40
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Im not exactly aware of how my aerial is installed (since I don't spend much time on the roof)

 

Do I just slowly push the aerial to align? Or are there some nuts and bolts to get through in general cases?

 
 
 
 


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  Reply # 289855 14-Jan-2010 02:47
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Darquel: Do I just slowly push the aerial to align? Or are there some nuts and bolts to get through in general cases?


Hi Darquel,

Ther will be nuts, holding a clamp or U-bolt, which need to be loosened then tightened again after you've moved the aerial.

Cheers,  Wild Bill.



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  Reply # 290051 14-Jan-2010 17:37
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Day 2, clear skies and relatively warm, signal is still rather fluctuating - Haven't moved UHF yet. (Low-Good signal, bordering the 'unwatchable' standard of TV viewing)

I think I will find an aerial installer to take a look at my aerial, since it's kind of on the edge of my roof (a dangerous position to be reaching up and playing with the clamps)...

Thanks for all the assistance, WildBill!

 

Also, if anyone has any recommended aerial installers, or knows of a professional who could assist in this situation, leave a message please =]



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  Reply # 292068 22-Jan-2010 05:00
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Just an update.
I had a professional come and take a look at my setup, and he seems to have replaced the signal amplifier and it's all working fine now. All the freeview channels in the program is being picked up too =]

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