Digital TV noise

Mon Jan 16, 2012 8:43 am   

I get digital noise, mostly on channel seven, at different times. just
checking the 'report' from the STB it says: quality- 100%, signal- 64%,
S/N ratio- 32db. so how good are these figures? obviously quality is not
a problem. what determines quality anyway? thanks,

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Mon Jan 16, 2012 9:24 am   

On 16/01/2012 5:43 PM, felix_unger wrote:

indicates the signal is well above the noise so would be watchable

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Mon Jan 16, 2012 10:05 am   

On Mon, 16 Jan 2012 18:43:49 +1100, felix_unger <me_at_nothere.com>
wrote:


Reported "quality" is a rubbery number related to decoded bit error
rate. At 100% it infers effectively zero decode errors, which doesn't
really fit with noise causing an issue.

Question time - are you seeing those numbers at the same time as the
noise is present? If so, the STB reckons all is good at its output
but the downstream teev is bitching. What does that tell you?

Mon Jan 16, 2012 10:18 am   

On 16/01/2012 6:42 PM, Wolfgang Wildeblood wrote:


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Mon Jan 16, 2012 10:42 am   

On Jan 16, 4:24 pm, atec77 <ate...@hotmail.com> wrote:


Pay attention to what you're replying to.

Mon Jan 16, 2012 10:43 am   

On 16-January-2012 7:24 PM, atec77 wrote:

yeah it's fine except when it's not.. :)

--
rgds,

Pete
-------
“If Julia is the answer, then what was the stupid question?!”

"Dumping the Gillard/Brown Government is the 'greatest moral imperative of our time'"

Mon Jan 16, 2012 10:49 am   

On 16/01/2012 7:43 PM, felix_unger wrote:

now can you think of a commonality when it happens
we have channel 44 problems with certain overcast conditions and
serious storms not that it matters unless gasoline is on

I should suggest once timing is established a house survey be done and
any interfering wall warts or electrical devices be audited

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Mon Jan 16, 2012 10:58 am   

On 16-January-2012 8:05 PM, who where wrote:

No those are the figures when the picture is fine. I will try to get
some when the pic is bad. btw I have several digital FTA devices
including the Telstra T-Box, and believe it or not, it handles
interference rather well. what local devices could possibly cause
interference with the digital FTA transmission? the noise often comes
between 4:30 and 7:30, but at other times too of course. I have a good
antenna system set up, but my four way splitter amp is plastic (Kingray)
and I wondered if the interference could be getting in that way, and if
a metal one would be superior in that regard? any recommendations? also
notice the interference comes more during wind, storm, and heat! but I
removed the (fringe area) antenna dismantled and cleaned all the element
connections and redid the cable connection. that boosted the signal
level a bit. this was about 12 months ago now tho.



--
rgds,

Pete
-------
“If Julia is the answer, then what was the stupid question?!”

"Dumping the Gillard/Brown Government is the 'greatest moral imperative of our time'"

“

Mon Jan 16, 2012 11:33 am   

felix_unger wrote

Nothing should do.


Thats suspicous.


But it may have a fault.


Unlikely.


See if you ever get the problem without it.


See above.


So you may have a fault, a poor joint somewhere.


But may not have fixed the fault.

Mon Jan 16, 2012 11:33 am   

felix_unger wrote


Presumably you mean pixellation.


That quality 100% is dubious.


Its a digital thing.

Mon Jan 16, 2012 11:40 am   

"felix_unger"



** Is that "7 Digital" on VHF 177.5 MHz ?

Are you in one of the capital cities?

You must describe what the "digital noise" looks like too.



..... Phil

Mon Jan 16, 2012 11:43 am   

On 16-January-2012 9:40 PM, Phil Allison wrote:


yes


melbourne, outer suburban



picture and sound break up. pixilation



--
rgds,

Pete
-------
“If Julia is the answer, then what was the stupid question?!”

Mon Jan 16, 2012 11:52 am   

"felix_unger"
Phil Allison wrote:



** For how long ?

Just brief bursts of "noise" or continuous ?


..... Phil

Mon Jan 16, 2012 2:59 pm   

felix_unger wrote:

I get real bad signal disruption every time a helicopter flies overhead or nearby.

I sometimes get a little noise on 10 (and its other stations) but nothing as bad
as when a helicopter fucks up the signal. Since I'm near the transmission
aerials, it is most likely some sort of disruption between my antenna and the
aerial.

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Tue Jan 17, 2012 2:54 am   

On 17-January-2012 12:59 AM, Dr Sir John Howard, AC, WSCMoF wrote:

I wonder if it's the police chopper?



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