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That's what balancing is ;-)
Sending the same signal up and down a pair of cables, then
subtracting
the difference to reject common interference...
-----Original Message-----
From: BUTLER, Tony,
FM
[mailto:tony.butler@xxxxxxx]
Sent: Fri 31/05/2002 14:26
To: 'ukha_d@xxxxxxx'
Cc:
Subject: RE:
[ukha_d] RE: cat5 cable picking up radio ?
Ah
now Mark - trying to shock me are yeh? :D
ISTR
reading some pants about why they select the pairs they do - something to
do
with separation of signals for maximum audio quality? I can't really
remember - it sounded like some excuse why they don't bother using
standards
more than anything. I'll try to locate the source of this info so I
can
check it again.
I
thought the balancing was achieved by taking the difference in the signals
down the two wires and the twisted pair aspect contributes to
reduction
in interference or something, but is not part of the balancing per
se?
Tony
Tony,
Linn recommend STP because... and sit down before you
read on... Knekt doesn't actually use the pairs for balancing.... Instead
it
uses any old cables in the bundle!
Linn uses pins 2&3 and 6&7 as the balanced
audio signals, standard CAT5 pairs are 1&2, 3&6, 4&5,
7&8.
Argghhhhh!!!! Why???????
-----Original Message-----
From: BUTLER, Tony, FM [mailto:tony.butler@xxxxxxx]
Sent: Fri 31/05/2002 13:33
To:
'ukha_d@xxxxxxx'
Cc:
Subject: RE: [ukha_d]
RE: cat5 cable picking up radio ?
Okay thanks. I had assumed (before I knew ethernet was
balanced) that it was for data purposes in electrically noisy
environments, so I was confused then when it turned out ethernet was
balanced after alll.....
Musical Images tried to make me go for STP when I bought the Linn
stuff off them.
I told them where to go and put in my own UTP at a greatly reduced
price. :D
Speaking of which, where can I get a roll of cheap CAT5 - it was 60
quid a roll last time I bought, but I've heard 25/30 quid bandied about
here a few times.
I will shortly have some work done on the house that will mean no
more opportunity to fit CAT5 without having to redecorate too and I'm
worried that though I have more than I need now, that I have still under
estimated future needs - especially when the KAT5 switcher materialises
:)
Am going to throw in a few more runs before it's too
late!
cheers,
Tony
Well - there are a few applications which use the 8 cores
separately rather than as 4 balanced pairs. STP might come in useful
there.
Also, it's useful in factory / industrial environments. If you want
cable to go anywhere near a blast-furnace, say.
I've never seen an application that called for it in a
domestic / office environment.
M.
-----Original Message-----
From: BUTLER,
Tony, FM [mailto:tony.butler@xxxxxxx]
Sent: Fri 31/05/2002
12:58
To: 'ukha_d@xxxxxxx'
Cc:
Subject: RE: [ukha_d] RE: cat5 cable picking up radio
?
Mark,
If CAT5 is designed for balanced signals, which are
(relatively) immune to interference, what then is the point of
screened CAT5?
It's a question I've been meaning to ask for a while (following
a previous discussion about ethernet being balanced) and you've just
reminded me of it.
Any ideas?
Tony
You CAN, if you really feel like it, wrap the CAT5 cable in
kitchen foil, and ground one end, which will help a bit...
... But it's fundamentally a crap way to do it. If you're going
to carry signals over CAT5, then they need to be balanced. The whole
point of balancing is in the rejection of interference (such as
shortwave radio.)
Doesn't matter whether you're talking 10baseT ethernet,
100baseT ethernet, or KAT5 audio... balancing is the only way to
go.
M.
-----Original Message-----
From: Amar
Nagi [mailto:amar@xxxxxxx]
Sent: Fri 31/05/2002
12:37
To: ukha_d@xxxxxxx
Cc:
Subject: cat5 cable picking up radio
?
I lay as a temporary solution a cat5 cable and i run audio
down
it to the a set of mulitmedia pc speakers in the
bedroom.
and for some reason it picks up radio. I can hear
a radio program in the audio.
any ideas ?
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