Poor reception Q's

Is digital transmission an all or nothing product ? For example, if
you use all the picture enhancement technology available under both
systems, and you have a poor but watchable analogue picture, will you
get a poor but watchable digital picture, or no picture ?

What percentage of households have been estimated to suffer a reduced
service after full implementation of the digital service in 2012 ?

Daytona

On 08/10/2007 18:25, Daytona wrote:

Is digital transmission an all or nothing product ?

More or less, once you stray beyond the limit of what the
error-correction can deal with, reception doesn't just degenerate a
little, it falls off a cliff, or is impossible.

"Daytona" wrote in message
ups.com...
Is digital transmission an all or nothing product ? For example, if
you use all the picture enhancement technology available under both
systems, and you have a poor but watchable analogue picture, will you
get a poor but watchable digital picture, or no picture ?

What percentage of households have been estimated to suffer a reduced
service after full implementation of the digital service in 2012 ?

Daytona




you either get the picture - as perfect as it gets, or you dont.
when i say you dont i dont mean you get a black screen, i mean you an
unwatchable picture consisting of a nasty mosaic of blocks.



--
Gareth.

That fly... is your magic wand.
http://www.last.fm/user/dsbmusic/

"Daytona" wrote in message
ups.com...
Is digital transmission an all or nothing product ? For example, if
you use all the picture enhancement technology available under both
systems, and you have a poor but watchable analogue picture, will you
get a poor but watchable digital picture, or no picture ?

What percentage of households have been estimated to suffer a reduced
service after full implementation of the digital service in 2012 ?

Daytona


Might not be quite as bad as it first looks. Most stations - certainly
all main stations - will see a significant power increase on their
existing digital transmissions. For instance I think I saw somewhere
recently that Emley Moor currently transmits 10KW erp per mux on
digital - after DSO it will be 174KW erp per mux.


--
Woody

harrogate three at ntlworld dot com

"the dog from that film you saw" wrote
in message ...
you either get the picture - as perfect as it gets, or you dont.
when i say you dont i dont mean you get a black screen, i mean you an
unwatchable picture consisting of a nasty mosaic of blocks.

"It looks like a container ship."

Bill

On 8 Oct, 18:36, Andy Burns wrote:
On 08/10/2007 18:25, Daytona wrote:

Is digital transmission an all or nothing product ?

More or less, once you stray beyond the limit of what the
error-correction can deal with, reception doesn't just degenerate a
little, it falls off a cliff, or is impossible.

Thanks for the replies - is there any way I can find out about the
error correction ?

Daytona

On 08/10/2007 23:20, Daytona wrote:

Thanks for the replies - is there any way I can find out about the
error correction ?

As a viewer you shouldn't /need/ to know about it, it should just work
to help ifn your signal is lower than it ought to be, or stop
interference from mopeds, fridges and light switches etc, but if you
search for DVT-T FEC (perhaps in conunction with QAM and MUX) you should
get relevant hits.

On 8 Oct, 23:45, Andy Burns wrote:

As a viewer you shouldn't /need/ to know about it, it should just work
to help ifn your signal is lower than it ought to be, or stop
interference from mopeds, fridges and light switches etc, but if you
search for DVT-T FEC (perhaps in conunction with QAM and MUX) you should
get relevant hits.

Thanks for that. The reason I'm looking into it more deeply is a)
because I like to try to understand things and b) because I'm nervous
of being left stranded when the power increase occurs upon analogue
switch off. I feel this has been touted as a cure all, but I'm
unconvinced.

I live in a semi rural area with a booster transmitter and trees
obscuring the line of site to it and depending upon the weather and
the amount of foliage, Channel4 & BBC1 can be unwatchable (fuzzy
picture and white noise), ITV1 pictures are always good, BBC2 is good
95% and we've never been able to receive Channel 5.

We're on the Haslemere booster transmitter - http://www.ukfree.tv/shutdowndetail.php?tx=SU886331

Terrain prevents line of sight to the main transmitters, poor analogue
signal available -
Midhurst (power increasing from 1,916W to 15,000W)
Hannington (power increasing from 16,666W to 37,500W)

Daytona

In article . com,
Daytona wrote:

I live in a semi rural area with a booster transmitter and trees
obscuring the line of site to it and depending upon the weather and
the amount of foliage, Channel4 & BBC1 can be unwatchable (fuzzy
picture and white noise), ITV1 pictures are always good, BBC2 is good
95% and we've never been able to receive Channel 5.

You may find that moving the position of your aerial will improve the poor
ones. Of course, you might make the good ones poor, too, but the art of
aerial rigging is to find a place where all 4 signals are good. I say all
4, because the Haslemere relay doesn't carry Ch5.


We're on the Haslemere booster transmitter - http://www.ukfree.tv/shutdowndetail.php?tx=SU886331

Terrain prevents line of sight to the main transmitters, poor analogue
signal available -
Midhurst (power increasing from 1,916W to 15,000W)
Hannington (power increasing from 16,666W to 37,500W)

Those power increases are for digital, but terrain will probably stop you
getting these as well. Your local relay will be converted to carry digital
signals.

--
From KT24 - in "Leafy Surrey"

Using a RISC OS computer running v5.11

"charles" wrote in message
...
I live in a semi rural area with a booster transmitter and trees
obscuring the line of site to it and depending upon the weather and
the amount of foliage, Channel4 & BBC1 can be unwatchable (fuzzy
picture and white noise), ITV1 pictures are always good, BBC2 is good
95% and we've never been able to receive Channel 5.

You may find that moving the position of your aerial will improve the poor
ones. Of course, you might make the good ones poor, too, but the art of
aerial rigging is to find a place where all 4 signals are good.

And then warning the customer that reception though trees cannot be
guaranteed.

Bill