RE: Sound hardware question..

["Ian Lowe" <ian@xxxxxxx>]

well, it's really that simple Tony..

Impedance of a CAT-5 pair is 100ohms, and required impedance of an
SP-DIF
carrier is 75ohms.
Not a whole world apart, and the electronics each end seems quite
forgiving..

I am running two SP-DIF carriers from my lounge PC, on a dodgy little
twin
phono lead with the ends bared, and crimped into an RJ45. this goes into
the
wall, up to node zero, where a short RJ45-RJ45 lead takes it out, and
back
down to one of the sockets at the other end of the living room, where
the
other half of that twin phono lead, also crimped onto an RJ45, carries
the
signal to the two "coax" inputs on my Amp.

I was *going* to make a balun, but thought I would try the dumb cable
approach first, and it works flawlessly. Somewhere along the way, I
thought... just how resilient is this signal...

And if you want to, you can run your SP-DIF across some 1.5mm T&E, or
a
generic loudspeaker cable.

The nice thing about the SPDIF is, the signal is either there, or
isn't..
there's no degradation, it just *stops* and for me, the signal didn't
*stop*
until I used about 2 lengths of 5 metres or so of bell wire, untwisted,
with
an air gap between them of whatever, as they lay on the floor in a
tangle.

although, I might have inverted the polarity ;)

I doubt if a coathanger would work, but it might :)

Another nice factoid: An SPDIF carrier doesn't interfere visibly with
an
S-Video signal going down the same cable, whereas analog audio does,
and
how...

Ian.

-----Original Message-----
From: BUTLER, Tony, FM [mailto:roaming@xxxxxxx]
Sent: 08 August 2002 14:27
To: 'ukha_d@xxxxxxx'
Subject: RE: [ukha_d] Sound hardware question..


> I am rapidly coming down to distributing regular audio
> throughout the house
> as
> SP-DIF over Cat5E (which works a treat, btw), especially as I think
it

Sorry Ian can't help you, but am interested in how you do this - is it
a
simple matter of using one twisted pair with the right connector on the
end?
Over in the KAT5 group, someone is looking to use a video channel to
encode/decode dolby digital, but if there's no need, it save a lot of
wonga!!
Again, if just the bare wires, over what distance is it okay?

Finally, if NOT just the bare wires, the what are u using?????

Soz for all q's - am interested so I can spit Ac-3 from my xbox back to
decoder in node 0.
Also opens up possibility of AC-3 in the bedroom from DVD
downstairs.......

cheers,


Tony


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