RE: Hi-Def video senders (long post, sorry!)

[Paul Gordon <paul_gordon@xxxxxxxxxxx>]

Is it even as long as that?... - been a long while, & my memory
isn't so good these days, but if I can remember anything at all from my
school physics lessons...

Assuming that electric charge travels close to the speed of light... I know
that's a gross simplification, since electrons have mass, and therefore
cannot travel anywhere near the speed of light... but the electrons
themselves are just charge carriers, and don't need to move very far or
very fast for current to flow at near instantaneous speed...

Anyway, ISTR that light speed (300,000 Kps) equates to approx 1 metre per
femtosecond (femtosecond = 10 to the -15th power)

So light would travel 6 metres in 6 femtoseconds...

If a current flowed through a conductor at only 1% of light speed, that
would still only require 600 femtoseconds to make it through 6 metres of
wire...

Or am I completely confused?!!?!

Paul G.


-----Original Message-----
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of Peter
Campion-Bye
Sent: 12 May 2011 17:56
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Hi-Def video senders (long post, sorry!)

It will take the electrons 20 nanoSeconds to travel that extra 6m.
I've a feeling your signals would have to be in the GigaHerz range
before that would make a significant difference.
BICBW.

On Thu, 12 May 2011 16:56:47 +0100, Paul Gordon
<paul_gordon@xxxxxxx> wrote:> Just a thought...
>
>  I presume it's fairly important for both CAT5 cables running to one
> of the
>  2-cable units to be of equal (or at least *very* similar lengths) to
> avoid
>  skew between the parts of the HDMI signal going down each run?....
> Any idea
>  how sensitive these are and how much tolerance there might be for
> different
>  lengths between the 2 CAT cables?
>
>  I ask because it has occurred to me that I *did* put a spare CAT5 run
> in the
>  other month... - but it goes to the other end of a 3m long run of
> kitchen
>  cupboards... I don't think it will be possible to feed it back those
> 3
>  metres, since it pops up through the floor and runs behind a fitted
> floor
>  unit, so the only option (if indeed it is even an option) would be to
> extend
>  it back along that run (on the underside of the wall units). Thus I
> could
>  get it to the required point without too much difficulty, but it
> would end
>  up being some 6m longer that the other one... (hmmm... I wonder if I
> could
>  equalise them at the other end?)
>
>  Cheers.
>
>  Paul G.




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