Digital TV noise

[felix_unger]

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,

--
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'"

“

 

[atec77]

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,

Pretty much useless figures unless the std is known , however it
indicates the signal is well above the noise so would be watchable

--









X-No-Archive: Yes

 

[atec77]

Pay attention to what you're replying to.

oh **** off idiot

--









X-No-Archive: Yes

 

[felix_unger]

Pretty much useless figures unless the std is known , however it
indicates the signal is well above the noise so would be watchable

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

 

[atec77]

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

Which is normal with digital
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

--









X-No-Archive: Yes

 

[felix_unger]

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?

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.

If so, the STB reckons all is good at its output
but the downstream teev is bitching. What does that tell you?

--
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'"

“

 

[Rod Speed]

felix_unger wrote

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?

Nothing should do.

the noise often comes between 4:30 and 7:30,

Thats suspicous.

but at other times too of course.

I have a good antenna system set up,

But it may have a fault.

but my four way splitter amp is plastic (Kingray) and I wondered if the interference could be getting in that way,
Unlikely.

and if a metal one would be superior in that regard?

See if you ever get the problem without it.

any recommendations?

See above.

also notice the interference comes more during wind, storm, and heat!

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

but I removed the (fringe area) antenna dismantled and cleaned all the element connections and redid the cable
connection.

But may not have fixed the fault.

 

[Rod Speed]

felix_unger wrote

I get digital noise, mostly on channel seven, at different times.

Presumably you mean pixellation.

just checking the 'report' from the STB it says: quality- 100%, signal 64%, S/N ratio- 32db. so how good are these
figures?

That quality 100% is dubious.

obviously quality is not a problem. what determines quality anyway?

Its a digital thing.

 

[Phil Allison]

"felix_unger"

I get digital noise, mostly on channel seven, at different times.

** 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

 

[Phil Allison]

"felix_unger"

melbourne, outer suburban



picture and sound break up. pixilation

** For how long ?

Just brief bursts of "noise" or continuous ?


..... Phil

 

[Dr Sir John Howard, AC, WSCMoF]

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,

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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- Juliar Dullard

 

[felix_unger]

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

I wonder if it's the police chopper?

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.

--
rgds,

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-------
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[Petzl]

I wonder if it's the police chopper?

Right now in Campbelltown (Sydney S/West) many of my digital channels
are dead. I get
1,2, 3, 10,11,22,23,24, 32,44
Don't get
7,9,72,73,90,99.
Have often had troubles with 7 group not the others, seems to be
weather/overcast humidity connected/related. Using old analogue aerial
so probably a new digital one would help.
Not realy bothered about it yet. Most of time I get the lot

 

[Phil Allison]

"Petzl"

Right now in Campbelltown (Sydney S/West) many of my digital channels
are dead. I get
1,2, 3, 10,11,22,23,24, 32,44
Don't get
7,9,72,73,90,99.
Have often had troubles with 7 group not the others, seems to be
weather/overcast humidity connected/related. Using old analogue aerial
so probably a new digital one would help.

** Campbelltown is 53kms from the transmitters at Artarmon and there is high
ground between.

Consider yourself lucky to get any UHF signal at all.

Try using a 3 metre long UHF Yagi on a 20 metre high mast.

VHF should be OK with a fringe area antenna too.



.... Phil

 

[Rod Speed]

Pretzl wrote

Right now in Campbelltown (Sydney S/West) many of my digital channels are dead.

Why does everything you touch turn to dog shit ?

I get
1,2, 3, 10,11,22,23,24, 32,44
Don't get
7,9,72,73,90,99.

Have often had troubles with 7 group not the others,

Likely they are all on the same transmitter.

seems to be weather/overcast humidity connected/related.
Unlikely.

Using old analogue aerial so probably a new digital one would help.

Unlikely. Many find that when the old antenna needs replacing
for analog, it works fine for digital as long as it can do UHF.

Not realy bothered about it yet. Most of time I get the lot

Yeah, I watch very little on 7, Air Crash Investigations only lately.

 

[RMD]

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,

I can have good signal level and quality, and getting a good picture,
but when there is interference present the interference gets to a
certain level and suddenly the digital TV signal strength and signal
quality just fall off a cliff and head towards zero. The picture and
sound either just disappear or are completely unwatchable because of
picture breakup, sound gone, etc

Digital TV works well while it is working, but there is no gradual
degradation with increasing interference, it just suddenly stops
working altogether.

I'm in a reception "black spot". High voltage powerline insulator
breakdown is a problem with hot, dry North winds. Cars with "hot"
unsuppressed ignitions are a nightmare for reception.

(On that note I've seen a "hot" ignition car put wide rolling bands of
noise all over the SBS analogue signal. Talk about a high powered
spark transmitter! _All_ the digital TV was just wiped out with this
car, which for a time belonged to the lad next door.)

Ross

 

[RMD]

Just as an addendum, I've recently replaced a general VHF channel 2-12
aerial with a log-periodic Channel VHF 6-12 antenna.

My old VHF aerial had pretty poor signal strength up at Channel 11-12
(where digital 2 and 10 are located), and the new aerial has vastly
improved performance on these two channels, which are much more
reliable now

It is 39C today with a north wind but there is no power-line
interference today, and reception on all digital channels is perfect.

Ross

 

[Dr Sir John Howard, AC, WSCMoF]

I wonder if it's the police chopper?

No, the one from the hospital. But all of them do it.

--

- KRudd at his finest.

"The Labour Party is corrupt beyond redemption!"
- Labour hasbeen Mark Latham in a moment of honest clarity.

"This is the recession we had to have!"
- Paul Keating explaining why he gave Australia another Labour recession.

"Silly old bugger!"
- Well known ACTU pisspot and sometime Labour prime minister Bob Hawke
responding to a pensioner who dared ask for more.

"By 1990, no child will live in poverty"
- Bob Hawke again, desperate to win another election.

"A billion trees ..."
- Borke, pissed as a newt again.

"Well may we say 'God save the Queen' because nothing will save the governor
general!"
- Egotistical shithead and pompous fuckwit E.G. Whitlam whining about his
appointee for Governor General John Kerr.

"SHUT THE **** UP YOU DUMB ****!"
- FlangesBum on learning the truth about Labour's economic capabilities.

"I don't care what you fuckers think!"
- KRudd the KRude Rat at his finest again.

"We'll just change it all when we get in."
- Garrett the carrott

"There will be no carbon tax."
- Juliar Dullard

 

[Rod Speed]

RMD wrote

I can have good signal level and quality, and getting a good picture,
but when there is interference present the interference gets to a
certain level and suddenly the digital TV signal strength and signal
quality just fall off a cliff and head towards zero. The picture and
sound either just disappear or are completely unwatchable because of
picture breakup, sound gone, etc

Digital TV works well while it is working, but there is no gradual
degradation with increasing interference, it just suddenly stops
working altogether.

Thats just plain wrong.

 

[Petzl]

"Petzl"


** Campbelltown is 53kms from the transmitters at Artarmon and there is high
ground between.

Consider yourself lucky to get any UHF signal at all.

Try using a 3 metre long UHF Yagi on a 20 metre high mast.

VHF should be OK with a fringe area antenna too.



... Phil

I just ran "setup" and those Digital above vanished entirely but get 9
on Analogue?
I will when I feel need arises just call a TV antennae/aerial guy they
should know. Not keen on getting on roof myself