Re: TV and sound over CAT5

[Raymond <Reb.barnett@xxxxxxx>]

I'm hoping to run output from a soundcard to the input of a hifi
amplifier over a CAT5 cable pair. Given this is not the full amplified
power can I expect this to work with reasonable quality, or do I need to
be more clever in sending the signal? Will the other cable pairs suffer
from induced noise even with low level signals or can I use them for
other purposes? I had thought that the point of using 'twisted pairs'
was so that they didn't cause/suffer to much interference (but I'm a
software guy, not a techie!).

Ray.

> -----Original Message-----
> From: nigel.orr@xxxxxxx [mailto:nigel.orr@xxxxxxx]
> Sent: 26 July 1999 12:20
> To: REB.Barnett@xxxxxxx
> Subject: [ukha_d] Re: TV and sound over CAT5
>
>
> At 03:26 26/07/99 -0700, you wrote:
> >Does anyone have suggestions for running UK TV signal over
> CAT5 wiring?
> > What are the limitations and what ancillary equipment is needed.
>
> I assume you mean baseband composite video, and not UHF.
> Less technically,
> you will be able to run one 'channel', not a complete aerial
> connection.
> I've been playing with a little CCD camera, running about 30m
> on cat-5,
> with the 12V power running 30m the other way, and it seems to
> work very
> well.  If you are using a colour camera, or longer cables,
> you'd be better
> to run it on 2 pairs as S-video, or on 3 pairs as RGB- cue Keith D...
>
> >Similarly does anyone have information about running speaker level
> >sound over cat5 wiring?
>
> Copper area is about 0.2mm^2 per wire.  1/0.6 wire is
> 0.28mm^2, rated at
> 1.8A.  To get 30W in an 8 ohm load, you need about 2A.
> Basically, it's a
> terrible idea, _unless_ you have vast quantities of cat-5 in
> already, you
> can safely run it as a 100V line, it is _impossible_ to run
> some T&E or
> similar mains cable instead etc etc etc.  There will probably
> be a sizable
> voltage drop due to the wire impedance over any sort of
> distance- it might
> not make much difference in level, but it might make the wire
> warm, and it
> might make the frequency response 'odd'.
>
> You could use several pairs of the cat-5 instead (the induced
> noise in the
> other pairs will make them unusable for anything else
> anyway), eg 1 cat-5
> cable for each speaker, but it's all a horrible bodge which I
> couldn't put
> up with in my own home... run some mains cable specifically
> for speakers if
> you possibly can instead.
>
> Nigel
>
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