can digital get picture if analog TV is weak?

[Mr.T]

"bassett" <bassett@bassettskennel.com.au> wrote in message
news:46b523a8$1@dnews.tpgi.com.au...

With digital there is no such thing as good or bad, You ether
have a signal or you don't.

Crappo. I consider no drop-outs/pixelation to be "good" and *lots* of
drop-outs/pixelation to be "bad".
No signal/picture at all would be "really bad" of course.

*** Define "Digital" antenna.

One designed specifically for reception of digital transmission frequencies,
in your area. One with a suitable feed co-ax and also suitable connections
etc.

They don't exist..

Sure they do, as defined.

Once you get digital you won't go back.

*** why would you want too ??????

So you can view Ch31/community access TV? :-(

MrT.

 

[Mr.T]

"John Tserkezis" <jt@techniciansyndrome.org.invalid> wrote in message
news:46b52624$0$29024$afc38c87@news.optusnet.com.au...

However a too strong signal can also cause reception problems. Of
course,
this doesn't happen very often, but it certainly has happened here in
Australia when people are close to the transmitters and still insist on
using
high gain antennas.

I'm guessing it comes down to the AGC range of the receiver at the high
end
of the scale, likely their analogue receiver was obviously better at
handling
high signals than their set top box or whatever.

I live in a strong signal area, and I always find the reverse to be true.

MrT.

 

[Mr.T]

<100246.2055@compuserve.com> wrote in message
news:1186307775.365828.172890@x40g2000prg.googlegroups.com...

As a generalisation if you have a snowy analogue signal with
ghosts then the probability is that you will get digital....

....... drop-outs.

MrT.

 

[Mr.T]

"Doug Jewell" <noone@nowhere.com> wrote in message
news:46b6461f$0$22576$5a62ac22@per-qv1-newsreader-01.iinet.net.au...

which means in your location you are tuning to UHF repeaters of 7 & 9.
This
may be the case in your location, and is the case in most of regional
australia, but in every eastern capital (and possibly adelaide & perth but
haven't checked), 7 & 9 are broadcast on channels 7 & 9 respectively which
are located in the VHF-H band.

Impossible while they are still transmitting analog signals on those
frequencies.
AFAIK, SEVEN transmits digital on ch6, NINE on ch8, TEN on ch11, and ABC on
ch12 in most capital cities.

MrT.

 

[bassett]

"Stuart" <stuart?@whodunnit8.com> wrote in message
news:57yti.16323$4A1.10417@news-server.bigpond.net.au...

"bassett" <bassett@bassettskennel.com.au> wrote in message
news:46b6922a@dnews.tpgi.com.au...


wrote:
"David L. Jones" <altz...@gmail.com> wrote in A "digital" antenna is
one
designed only for the channels used by
digital TV, and those *do* exist. Perhaps they should be called
"digital band" or something to avoid the stupid semantic arguments.

My "digital" antenna is is not only designed just for the digital
channels, but it's a log-periodic design too which can give an
improved signal and better noise immunity in some situations. Much
smaller and nicer looking than my old "analog" band yagi antennas.

Dave.


Just perhaps you could provide a link to your "digital" antenna,
then we can all evaluate it.
bassett

It's all about syntax - of course there is no such thing as a digital
antenna or a digital microphone for that matter but it is human nature,
especially in Australia to shorthand the language even if it's technically
wrong. Personally I like this charming Australian characteristic.

A so called "digital antenna" is one that has been designed to receive
those frequencies that are used in Australia for DTV.ie nothing below Ch6
(analog). Mine is a Fraccaro log periodic
http://www.laceys.tv/secure/index.php as is my friend who has absolutely
no
analog reception regardless of antenna design array, well not unless he
was
willing to put up a 200 foot pole! The Fracarro pulls in 96% signal
strength
with similar quality on his Topfield 5000. And here I am a few suburbs
away
with perfect line of site with 100%. So this antenna must be doing
something
the others don't, all tried by a antenna specialist engineer (not Hills!
etc) who did extensive measurements of signal strength and quality using a
range of antenna designs. So as far as my friend is concerned he is not
the
least bit interested in the technical analysis just the excellent results
he
has achieved for a $50 antenna that is quite tiny, even the birds don't
sit
on it and another $150 for installation and new quad cable etc..

Thanks Stu, your a lone voice in the wilderness. People are gulable
when it comes to this sort of thing, Just say "digital" and the price
goes up, The intrest intensifies, and people cue up to be ripped
off.

The link that Phil posted [Hi Phil] is a typicial example of the
rip-off machine in action. About the only thing you might need is a
better cableing system , In other words swap the cable for a length of
RG 6, thats worth 30 cents a meter and people like Dick Smith sell
for $3 a meter. Cos it's digital cable. and your away.
bassett

 

[bassett]

"Mr.T" <MrT@home> wrote in message
news:46b6cd74$0$7087$afc38c87@news.optusnet.com.au...

"bassett" <bassett@bassettskennel.com.au> wrote in message
news:46b523a8$1@dnews.tpgi.com.au...
With digital there is no such thing as good or bad, You ether
have a signal or you don't.

Crappo. I consider no drop-outs/pixelation to be "good" and *lots* of
drop-outs/pixelation to be "bad".
No signal/picture at all would be "really bad" of course.

I don't think you have idea, just how digital works. With digital
you get a picture or you don't. it's that simple. No snow, no noise,
etc. also there is no need for a mast head amp, EVER. regardless
of what your installer might tell you.
Digital works with a multi-layer of signals, once the signal is
transmitted , it's picked up by the forward error correction, [FEC]
in the receiver and the best signals are selected and sent to the
tuner Most common configuration is 3/4. From the four signals
sent it selects three, If it can't find three it simply shuts
down . You might get some pixallation in heavy rain, this happens
simply because for a few millie-seconds it can't access the signal
requirements, If it continues it simply shuts down, until it can
work as it should.

*** Define "Digital" antenna.

One designed specifically for reception of digital transmission
frequencies, in your area. One with a suitable feed co-ax and also
suitable connections etc.

There is no differance between antenna types, they work or they
don't. it;'s as simple as that. In some situations plan old "rabbit"
ears will work, or a coat hanger, and there's nothing digital about
them,

They don't exist..

Sure they do, as defined.

examples please

Once you get digital you won't go back.

*** why would you want too ??????

So you can view Ch31/community access TV? :-(

MrT.
Not in country area's mate.

bassett

 

[Phil Allison]

"bassett"
"Stuart"

A so called "digital antenna" is one that has been designed to receive
those frequencies that are used in Australia for DTV.ie nothing below Ch6
(analog). Mine is a Fraccaro log periodic ......


Thanks Stu, your a lone voice in the wilderness. People are
gulable when it comes to this sort of thing, Just say "digital" and
the price goes up, The intrest intensifies, and people cue up to
be ripped off.

The link that Phil posted [Hi Phil] is a typicial example of the
rip-off machine in action.

** The link I posted was for the EXACT SAME ANTENNA

- you bloody half- wit !!


http://www.australiandigitaltv.com/accessories/digitalantenna.htm



......... Phil

 

[David L. Jones]

On Aug 7, 12:46 pm, "bassett" <bass...@bassettskennel.com.au> wrote:

"bassett" <bass...@bassettskennel.com.au> wrote in message
news:46b523a8$1@dnews.tpgi.com.au...
With digital there is no such thing as good or bad, You ether
have a signal or you don't.

Crappo. I consider no drop-outs/pixelation to be "good" and *lots* of
drop-outs/pixelation to be "bad".
No signal/picture at all would be "really bad" of course.

I don't think you have idea, just how digital works.

You really don't get it do you "Basset"?

I agree with MrT. How often you get drop-out's effectively determines
how good or bad a digital TV reception you've got. Lots of drop-outs
is certainly "worse" than no drop-outs. Yes it's still digital, but
that's not the point.

With digital
you get a picture or you don't. it's that simple. No snow, no noise,
etc. also there is no need for a mast head amp, EVER. regardless
of what your installer might tell you.
Digital works with a multi-layer of signals, once the signal is
transmitted , it's picked up by the forward error correction, [FEC]
in the receiver and the best signals are selected and sent to the
tuner Most common configuration is 3/4. From the four signals
sent it selects three, If it can't find three it simply shuts
down . You might get some pixallation in heavy rain, this happens
simply because for a few millie-seconds it can't access the signal
requirements, If it continues it simply shuts down, until it can
work as it should.

*yawn*

*** Define "Digital" antenna.

One designed specifically for reception of digital transmission
frequencies, in your area. One with a suitable feed co-ax and also
suitable connections etc.

There is no differance between antenna types, they work or they
don't. it;'s as simple as that.

You really don't get it do you "Basset"?
A "digital" antenna designed just for the digital TV bands of interest
is certainly a different "type" of antenna than say an analog Yagi or
rabbit ears.

In some situations plan old "rabbit"
ears will work, or a coat hanger, and there's nothing digital about
them,

*yawn*
Give up dude.

Dave.

 

[Phil Allison]

"bassett"

I don't think you have idea, just how digital works.

** This next bit is hysterical .......

With digital you get a picture or you don't. it's that simple. No
snow, no noise, etc. also there is no need for a mast head amp,
EVER. regardless of what your installer might tell you.

** Wow - not even with 200 metres of co-ax after the antenna ....

Digital works with a multi-layer of signals, once the signal is
transmitted , it's picked up by the forward error correction, [FEC]
in the receiver and the best signals are selected and sent to the
tuner

** Hmmmmm - just like the TV ad says :

Its the BITS that John West rejects that make the TUNA work best ....

Most common configuration is 3/4. From the four signals sent it
selects three, If it can't find three it simply shuts down .

** ROTFL !!!..

Everyone knows that 2 out of 3 ain't bad !!!

You might get some pixallation in heavy rain,

** The connection with " pixies " here is getting very strong.

" bassett " is chasing them all over the damn place !!!!!




........ Phil

 

[David L. Jones]

On Aug 7, 12:28 pm, "bassett" <bass...@bassettskennel.com.au> wrote:

"Stuart" <stua...@whodunnit8.com> wrote in message

news:57yti.16323$4A1.10417@news-server.bigpond.net.au...





"bassett" <bass...@bassettskennel.com.au> wrote in message
news:46b6922a@dnews.tpgi.com.au...

wrote:
"David L. Jones" <altz...@gmail.com> wrote in A "digital" antenna is
one
designed only for the channels used by
digital TV, and those *do* exist. Perhaps they should be called
"digital band" or something to avoid the stupid semantic arguments.

My "digital" antenna is is not only designed just for the digital
channels, but it's a log-periodic design too which can give an
improved signal and better noise immunity in some situations. Much
smaller and nicer looking than my old "analog" band yagi antennas.

Dave.

Just perhaps you could provide a link to your "digital" antenna,
then we can all evaluate it.
bassett

It's all about syntax - of course there is no such thing as a digital
antenna or a digital microphone for that matter but it is human nature,
especially in Australia to shorthand the language even if it's technically
wrong. Personally I like this charming Australian characteristic.

A so called "digital antenna" is one that has been designed to receive
those frequencies that are used in Australia for DTV.ie nothing below Ch6
(analog). Mine is a Fraccaro log periodic
http://www.laceys.tv/secure/index.php as is my friend who has absolutely
no
analog reception regardless of antenna design array, well not unless he
was
willing to put up a 200 foot pole! The Fracarro pulls in 96% signal
strength
with similar quality on his Topfield 5000. And here I am a few suburbs
away
with perfect line of site with 100%. So this antenna must be doing
something
the others don't, all tried by a antenna specialist engineer (not Hills!
etc) who did extensive measurements of signal strength and quality using a
range of antenna designs. So as far as my friend is concerned he is not
the
least bit interested in the technical analysis just the excellent results
he
has achieved for a $50 antenna that is quite tiny, even the birds don't
sit
on it and another $150 for installation and new quad cable etc..

Thanks Stu, your a lone voice in the wilderness.

Lone voice?
I said that earlier in the thread:
http://groups.google.com.au/group/aus.electronics/browse_frm/thread/77397d5268a10553/b39e6f3e6c5b435e?hl=en#b39e6f3e6c5b435e

People are gulable
when it comes to this sort of thing, Just say "digital" and the price
goes up, The intrest intensifies, and people cue up to be ripped
off.

The link that Phil posted [Hi Phil] is a typicial example of the
rip-off machine in action.

The link Phil posted (which was my original link in an old thread) is
the exact "digital band" antenna being talked about!
It is *not* an example of "the rip-off machine in action", it is a
log-periodic digital band antenna, designed just for the digital
channels.

Let me know your PayPal address so I can send you a dollar so you can
buy yourself a clue.

Dave.

 

[Alan Rutlidge]

"bassett" <bassett@bassettskennel.com.au> wrote in message
news:46b7dd0b$3@dnews.tpgi.com.au...

"Stuart" <stuart?@whodunnit8.com> wrote in message
news:57yti.16323$4A1.10417@news-server.bigpond.net.au...

"bassett" <bassett@bassettskennel.com.au> wrote in message
news:46b6922a@dnews.tpgi.com.au...


wrote:
"David L. Jones" <altz...@gmail.com> wrote in A "digital" antenna is
one
designed only for the channels used by
digital TV, and those *do* exist. Perhaps they should be called
"digital band" or something to avoid the stupid semantic arguments.

My "digital" antenna is is not only designed just for the digital
channels, but it's a log-periodic design too which can give an
improved signal and better noise immunity in some situations. Much
smaller and nicer looking than my old "analog" band yagi antennas.

Dave.


Just perhaps you could provide a link to your "digital" antenna,
then we can all evaluate it.
bassett

It's all about syntax - of course there is no such thing as a digital
antenna or a digital microphone for that matter but it is human nature,
especially in Australia to shorthand the language even if it's
technically
wrong. Personally I like this charming Australian characteristic.

A so called "digital antenna" is one that has been designed to receive
those frequencies that are used in Australia for DTV.ie nothing below Ch6
(analog). Mine is a Fraccaro log periodic
http://www.laceys.tv/secure/index.php as is my friend who has absolutely
no
analog reception regardless of antenna design array, well not unless he
was
willing to put up a 200 foot pole! The Fracarro pulls in 96% signal
strength
with similar quality on his Topfield 5000. And here I am a few suburbs
away
with perfect line of site with 100%. So this antenna must be doing
something
the others don't, all tried by a antenna specialist engineer (not Hills!
etc) who did extensive measurements of signal strength and quality using
a
range of antenna designs. So as far as my friend is concerned he is not
the
least bit interested in the technical analysis just the excellent results
he
has achieved for a $50 antenna that is quite tiny, even the birds don't
sit
on it and another $150 for installation and new quad cable etc..


Thanks Stu, your a lone voice in the wilderness. People are
gulable when it comes to this sort of thing, Just say "digital" and
the price goes up, The intrest intensifies, and people cue up to
be ripped off.

The link that Phil posted [Hi Phil] is a typicial example of the
rip-off machine in action. About the only thing you might need is a
better cableing system , In other words swap the cable for a length
of RG 6, thats worth 30 cents a meter and people like Dick Smith
sell for $3 a meter. Cos it's digital cable. and your away.
bassett

Although as Bassett has said, there are a lot of rip-offs out there and
certainly a lot of misinformation about digital antennae systems, there is
some info which is correct. For example - Anyone from the good old analogue
days (circa 1980's) will recall the Hill's Telray series VHF antennae. When
I went across to digital very early in the piece my antenna system consisted
of a Telray TL4, a Hills Band 4 UHF antenna (20 or more elements - can't
recall the model number) and a diplexer hooking the two together, fed by
double shielded coax similar but not the same as the current RG6. The
combination worked quite well for analogue not withstanding the unfixable
ghosting problems in my reception area.

On purchasing a STB I noticed reception of ABC digital (VHF ch 12) was very
flaky and the signal level almost down in the "red" compared to the other
digital channels which were way up the other end of the scale. It turned
out that after pulling up the specs on the TL4 that it performs very well to
Ch11, where thereafter the gain of the antenna takes a steep dive. This
along with the original diplexer really knocked the crap out of the signal
level at those frequencies. Replacing the TL4 with a Hill's DY10 and
upgrading the diplexer totally solved the problem.

There is however a bit more to the story. Replacing the diplexer also meant
replacing the short lengths of cable between the antennae and the diplexer
with F connectors (replacing saddle clamp connections) and of course fitting
the downlead with an F connector too.

It is recognised within the industry that albeit the digital signal is
relatively robust it isn't completely immune to interference. Whereas with
analogue we put up with the odd bit of noise on the picture, digital can be
affected to the point of significant pixilation and muting of the audio.
This can be subjectively more annoying than watching a noisy analogue
picture. Antenna downfeeds and distribution cables installed in close
proximity to power cables, fluoro lighting and some other electrically
"noisy" equipment can degrade the quality of the received digital signal
leading to pixilation and in some cases muting of the audio. Using a good
quality tri or quad shielded coax and sensible placement of the cable(s) in
relationship to other electrical services can make all the difference to the
quality of the signal the TV or STB receives.

Unfortunately there are a lot of legacy analogue antenna systems out there.
Some suitable for digital, some not. Blocks of flats with amplified
distribution systems designed purely for analogue are typically a nightmare
for digital as only the designated analogue channels are amplified and
equalised, leaving the intervening digital channels with level and
equalisation problems. Likewise there are some houses out there with a good
old ch2, 7, 9 antenna with a 300 ohm balance ribbon feed. With the
exception of SBS they are probably getting by with adequate analogue
reception but lets face it, the antenna has probably seen 30+ years of life
and is well and truly overdue for replacement. The sad part is the owner
will be quite prepared to fork out $4k on a new plasma or LCD TV but won't
spend a couple of hundred bucks getting the antenna system replaced.

Cheers,
Alan

 

[David L. Jones]

On Aug 7, 1:33 pm, "Alan Rutlidge"
<don't_spam_me_rutli...@iinet.net.au> wrote:

It is recognised within the industry that albeit the digital signal is
relatively robust it isn't completely immune to interference. Whereas with
analogue we put up with the odd bit of noise on the picture, digital can be
affected to the point of significant pixilation and muting of the audio.
This can be subjectively more annoying than watching a noisy analogue
picture. Antenna downfeeds and distribution cables installed in close
proximity to power cables, fluoro lighting and some other electrically
"noisy" equipment can degrade the quality of the received digital signal
leading to pixilation and in some cases muting of the audio. Using a good
quality tri or quad shielded coax and sensible placement of the cable(s) in
relationship to other electrical services can make all the difference to the
quality of the signal the TV or STB receives.

Unfortunately I'm still having issues with interference after trying
all the usual recommendations:
- replaced all my cabling to quad shield RG6 and F connectors, even
from the wall outlet to the TV.
- switched to a new higher gain antenna to get better signal strength
- checked my mains earthing
- connected the antenna to its own earth stake.
- made sure the cabling was not near any other cables
- and finally switched antenna's yet again to a log-periodic type
(that reduced the number of drop-out's very significantly)

But alas I still get the occasional drop-out due to some external
influence (not local appliance switching in my house, although that
does it too), and of course due to MrMurphy it's always right at a key
point in a show. Losing the picture for a second is ok, but the audio
pop is really annoying.

But at least it's down to a very manageable level now.

Dave.

 

[Phil Allison]

"David L. Jones"

Losing the picture for a second is ok, but the audio
pop is really annoying.

** Some STBs produce occasional huge audio pops ( like the TEAC DVB-300)
while others are near silent when a burst interference causes the pic to
freeze.

However, an audio pop could be nothing to do with the STB but rather a
result of the same RF burst getting into the audio earth wiring due to the
existence of ground loops.

Try installing an antenna isolator before the STB.




........ Phil

 

[Alan Rutlidge]

"David L. Jones" <altzone@gmail.com> wrote in message
news:1186458748.585499.164800@i13g2000prf.googlegroups.com...

On Aug 7, 1:33 pm, "Alan Rutlidge"
don't_spam_me_rutli...@iinet.net.au> wrote:
It is recognised within the industry that albeit the digital signal is
relatively robust it isn't completely immune to interference. Whereas
with
analogue we put up with the odd bit of noise on the picture, digital can
be
affected to the point of significant pixilation and muting of the audio.
This can be subjectively more annoying than watching a noisy analogue
picture. Antenna downfeeds and distribution cables installed in close
proximity to power cables, fluoro lighting and some other electrically
"noisy" equipment can degrade the quality of the received digital signal
leading to pixilation and in some cases muting of the audio. Using a
good
quality tri or quad shielded coax and sensible placement of the cable(s)
in
relationship to other electrical services can make all the difference to
the
quality of the signal the TV or STB receives.

Unfortunately I'm still having issues with interference after trying
all the usual recommendations:
- replaced all my cabling to quad shield RG6 and F connectors, even
from the wall outlet to the TV.
- switched to a new higher gain antenna to get better signal strength
- checked my mains earthing
- connected the antenna to its own earth stake.
- made sure the cabling was not near any other cables
- and finally switched antenna's yet again to a log-periodic type
(that reduced the number of drop-out's very significantly)

But alas I still get the occasional drop-out due to some external
influence (not local appliance switching in my house, although that
does it too), and of course due to MrMurphy it's always right at a key
point in a show. Losing the picture for a second is ok, but the audio
pop is really annoying.

But at least it's down to a very manageable level now.

Dave.

Albeit I think I've just about solved all my digital TV reception issues, it
is still far from perfect. :-(
AFAIK in Perth the digital transmitters are not running at full power
(apparently to reduce interference) to older analogue sets and analogue VCRs
with less than perfect tuners. When and if the analogue services are shut
down the digital transmitters will be allowed to run at full power. This
should improve the signal to noise ratio and hopefully resolve some
reception problems. Having said that, too much signal level can be a
problem as well. Attenuating the signal at the wall outlet will not only
reduce the signal level to an acceptable one, but reduce the interfering
noise by the same amount.

The problem with RF is it isn't a totally predictable science. Take mobile
phone coverage as an example. There are too many variables which influence
the propagation of the signal to be totally sure of the outcome. Add
external interferences (natural and man made) and you have a cocktail of
situations which can lead to problems. And of course there are the
variations in tuners from very good to bloody woeful. No wonder Joe Average
is confused. If you haven't already visited the DTV forum it might be worth
your while for advice (both good and bad). http://www.dtvforum.info/ It
isn't the definitive answer to all your questions, but at least it's a start
and there are some knowledgeable bods there who are willing to share there
expertise.

Cheers,
Alan

 

[Mr.T]

"bassett" <bassett@bassettskennel.com.au> wrote in message
news:46b7dd0c@dnews.tpgi.com.au...

With digital there is no such thing as good or bad, You ether
have a signal or you don't.

Crappo. I consider no drop-outs/pixelation to be "good" and *lots* of
drop-outs/pixelation to be "bad".
No signal/picture at all would be "really bad" of course.

I don't think you have idea, just how digital works. With
digital
you get a picture or you don't.

Funny then that I have a digital STB and a digital PVR that both give
picture drop-outs on occasion.
And I am in a good signal area. My friend who also has a STB and PVR suffers
*far* worse problems.

I suggest it is YOU who has no idea!

it's that simple.

Or you are!

*** Define "Digital" antenna.

One designed specifically for reception of digital transmission
frequencies, in your area. One with a suitable feed co-ax and also
suitable connections etc.

There is no differance between antenna types, they work or they
don't. it;'s as simple as that. In some situations plan old "rabbit"
ears will work, or a coat hanger, and there's nothing digital about
them,

Pity you can't read the definition given, or simply can't understand it.
But I am indeed envious if you live in a rural area and *never* get any
signal problems, especially with an "old coat hanger"!

They don't exist..

Sure they do, as defined.

examples please

Others have already posted examples. Have you looked at those yet?

MrT.

 

[Mr.T]

"David L. Jones" <altzone@gmail.com> wrote in message
news:1186456928.802872.71560@x35g2000prf.googlegroups.com...

Let me know your PayPal address so I can send you a dollar so you can
buy yourself a clue.

Save your dollar, he wouldn't know where to buy one.

MrT.

 

[dmm]

On Mon, 06 Aug 2007 20:52:28 -0700, "David L. Jones" <altzone@gmail.com> wrote:

On Aug 7, 1:33 pm, "Alan Rutlidge"
don't_spam_me_rutli...@iinet.net.au> wrote:
It is recognised within the industry that albeit the digital signal is
relatively robust it isn't completely immune to interference. Whereas with
analogue we put up with the odd bit of noise on the picture, digital can be
affected to the point of significant pixilation and muting of the audio.
This can be subjectively more annoying than watching a noisy analogue
picture. Antenna downfeeds and distribution cables installed in close
proximity to power cables, fluoro lighting and some other electrically
"noisy" equipment can degrade the quality of the received digital signal
leading to pixilation and in some cases muting of the audio. Using a good
quality tri or quad shielded coax and sensible placement of the cable(s) in
relationship to other electrical services can make all the difference to the
quality of the signal the TV or STB receives.

Unfortunately I'm still having issues with interference after trying
all the usual recommendations:
- replaced all my cabling to quad shield RG6 and F connectors, even
from the wall outlet to the TV.
- switched to a new higher gain antenna to get better signal strength
- checked my mains earthing
- connected the antenna to its own earth stake.
- made sure the cabling was not near any other cables
- and finally switched antenna's yet again to a log-periodic type
(that reduced the number of drop-out's very significantly)

But alas I still get the occasional drop-out due to some external
influence (not local appliance switching in my house, although that
does it too), and of course due to MrMurphy it's always right at a key
point in a show. Losing the picture for a second is ok, but the audio
pop is really annoying.

But at least it's down to a very manageable level now.

Dave.

Try raising or lowering the antenna by 300mm or so. Multipath reflections
might be causing some of your problems.

 

[David L. Jones]

On Aug 7, 7:38 pm, dmm <dmmilne_REMO...@ozemail.com.au> wrote:

On Mon, 06 Aug 2007 20:52:28 -0700, "David L. Jones" <altz...@gmail.com> wrote:



On Aug 7, 1:33 pm, "Alan Rutlidge"
don't_spam_me_rutli...@iinet.net.au> wrote:
It is recognised within the industry that albeit the digital signal is
relatively robust it isn't completely immune to interference. Whereas with
analogue we put up with the odd bit of noise on the picture, digital can be
affected to the point of significant pixilation and muting of the audio.
This can be subjectively more annoying than watching a noisy analogue
picture. Antenna downfeeds and distribution cables installed in close
proximity to power cables, fluoro lighting and some other electrically
"noisy" equipment can degrade the quality of the received digital signal
leading to pixilation and in some cases muting of the audio. Using a good
quality tri or quad shielded coax and sensible placement of the cable(s) in
relationship to other electrical services can make all the difference to the
quality of the signal the TV or STB receives.

Unfortunately I'm still having issues with interference after trying
all the usual recommendations:
- replaced all my cabling to quad shield RG6 and F connectors, even
from the wall outlet to the TV.
- switched to a new higher gain antenna to get better signal strength
- checked my mains earthing
- connected the antenna to its own earth stake.
- made sure the cabling was not near any other cables
- and finally switched antenna's yet again to a log-periodic type
(that reduced the number of drop-out's very significantly)

But alas I still get the occasional drop-out due to some external
influence (not local appliance switching in my house, although that
does it too), and of course due to MrMurphy it's always right at a key
point in a show. Losing the picture for a second is ok, but the audio
pop is really annoying.

But at least it's down to a very manageable level now.

Dave.

Try raising or lowering the antenna by 300mm or so. Multipath reflections
might be causing some of your problems.

Tried that, no joy.

Thanks
Dave.

 

[David L. Jones]

On Aug 7, 2:04 pm, "Phil Allison" <philalli...@tpg.com.au> wrote:

"David L. Jones"

Losing the picture for a second is ok, but the audio
pop is really annoying.

** Some STBs produce occasional huge audio pops ( like the TEAC DVB-300)
while others are near silent when a burst interference causes the pic to
freeze.

I've tried 3 different STB's and all are pretty much the same with the
interference and the popping. Guess I didn't get lucky.

However, an audio pop could be nothing to do with the STB but rather a
result of the same RF burst getting into the audio earth wiring due to the
existence of ground loops.

Try installing an antenna isolator before the STB.

Will do, thanks Phil.
A quick search doesn't turn up much though, know where I can get one?

Thanks
Dave.

 

[Phil Allison]

"David L. Jones"
Phil Allison

However, an audio pop could be nothing to do with the STB but rather a
result of the same RF burst getting into the audio earth wiring due to
the
existence of ground loops.

Try installing an antenna isolator before the STB.

Will do, thanks Phil.
A quick search doesn't turn up much though, know where I can get one?

** K-Mart used to sell 'em.

Not impossible to wind your own iso-balun.




........ Phil