Re: End of analog TV

On Fri, 21 Nov 2008 16:30:40 -0000, GMAN <glenzabr@xxxxxxxxxxxxxxxxxxx> wrote:

In article <op.ukvn1sma4buhsv@xxxxxxxxxxxxxxx>, "Peter Hucker" <none@xxxxxxxx> wrote:
On Tue, 18 Nov 2008 22:34:06 -0000, Arfa Daily <arfa.daily@xxxxxxxxxxxx> wrote:


"Peter Hucker" <none@xxxxxxxx> wrote in message
news:op.uktwxiuo4buhsv@xxxxxxxxxxxxxxxxxx
On Tue, 18 Nov 2008 13:39:58 -0000, Samuel M. Goldwasser
<sam@xxxxxxxxxxxxxx> wrote:

dplatt@xxxxxxxxxxxx (Dave Platt) writes:

Does anyone know how wind affects uhf tv propagation?

UHF is largely line-of-site, with reflections thrown in to complicate
matters.

I have noticed that my digital tv reception gets really bad (pixelation
and dropped sound) when the wind gets strong. ie: 30 to 40 mph with
higher gusts of 50 to 60. It is not my antenna blowing in the wind
since
the antenna is in an attic crawspace.

My guess would be that you're seeing the effect of nearby trees
blowing around in the wind. This will cause rapid variations in
multipath cancellation (in effect, moving "echoes" from the moving
leaves) and could be overwhelming the multipath-echo cancellation
logic in the receiver.

If you watch an analog UHF station under these conditions, do you tend
to see "ghost" echoes on the screen which come and go, or move around,
as the wind blows?

Using a highly-directional UHF antenna might reduce the problem -
it'll have a stronger direct signal from the transmitter, and will be
less sensitive to multipath reflections arriving from other angles.

That's great if you want to fiddle with an antenna for each channel
or set up a complicated antanna that can be optimized for each
channel.

But a lot of us were very happy with analog TV and all its shortcomings.

To me it is 1000 percent less annoying to see some snow or ghosts
when it's windy or raining or I'm watching a distant channel then to
have the picture freeze or pixelate and the sound to drop out entirely.

And, adjusting an antenna for analog is totally real time.
Move the antanna and its effect is instantaneous. With DTV - at least
what I've seen to far - the only way to really do this is with the
signal strength monitor which might be downa couple of menu levels,
and that's not real time. There is a very significant lag and even
then it doesn't always show what the true situation is.

This is not progress!

Very odd, as on the SAME aerial, with no adjustment, I get a perfect
digital picture on freeview terrestrial. On analogue terrestrial I got
irritating snow on quite a few of the channels.


Then you are indeed one very lucky Hucker ... Far from it being the case
that the powers who be would have you believe, in that the changeover is as
smooth and simple as just gluing your STB or digital telly on the end of
your existing antenna, in many parts of the UK, including where I live, the
joy of your new purchase has been short-lived, after getting it out of the
box and finding that it receives almost nothing. The fading joy then turns
to dismay when you further discover that your fifteen quid Tesco-Sonic box,
is going to need a 150 quid cake cooling rack with 49 rung step ladder in
front of it, jammed up on your roof in place of the neat little 10 ele Yagi
that you had there for your analogue reception ...

All so that you can get the Shopping Channel in glorious pixellated
plastic-view, complete with motion lag and digital artifacts, compounded by
the digital processing in your brand new LCD TV to make it work non-native
to display standard definition transmissions, rather than the nice Blu-Ray
demo piccies you saw in the shop, and which convinced you to part with your
hard-earned ...

Digital ? Bah humbug, I say !

Where are you lot living with all these problems? I'm in central Scotland and
everyone round here who has changed to digital (meaning within a 30 mile
radius, not just one street) has had a great picture. A few have had to buy a
new aerial, but we knew we might need one. Everyone has got a better picture
than on analogue.

Yes you have mountains in Scotland (Visited there a while back, love your
country and its people BTW!!!) , but you havent seen mountains till you visit
the Rocky Mountains. We have a severe problem with TV signals and mountain
ranges in the far western United States. I live in Utah and its amazing you
can get anything OTA here.

What makes it at least useable is the fact that most of the regular networks
are on the same mountain peak here in the Salt Lake City area so you dont
really have to use a multideirectional antenna to get the vast majority of
stations. Whereas back east like in Ohio, you have overlapping stations from
at least 4 different states and directions giving them completely different
problems.

Your dish reception should be ok though. Satellites were invented a while back, why is anyone still using terrestrial communications?

--
http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com

Women are not served here. You have to bring your own.
.

Relevant Pages

  • Re: End of analog TV
    ... and dropped sound) when the wind gets strong. ... It is not my antenna blowing in the wind ... If you watch an analog UHF station under these conditions, ... Yes you have mountains in Scotland (Visited there a while back, ...
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  • Re: End of analog TV
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    (sci.electronics.repair)
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    (sci.electronics.repair)
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