And watch the level and the impedance - I've
helped to fix several situations that had
excessive crosstalk on adjacent pairs,
and each time it's been one of two causes:
1) a too-high audio level on the pair that was
the source of the problem. Solution: No more
then zero dbm on any pair...
2) the pair that was receiving the problem
was a high impedance load or an unbalanced
load (i.e. one side grounded). Use an ungrounded
600 ohm winding from a transformer on each
end of each pair.
Mike WA6ILQ
At 11:34 AM 02/28/10, you wrote:
Don't forget, CAT cables have different twist rates for each pair to
minimize crosstalk between them. If one pair doesn't work, try another.
From: larynl2 <[email protected]>
To: [email protected]
Sent: Sun, February 28, 2010 12:27:53 PM
Subject: [Repeater-Builder] Re: LOOONG audio runs
A friend of mine full-time broadcast engineering told me he can
detect zero crosstalk between pairs within the same CAT 5 cable at
line level. As you suspect, balance is very important.
Laryn K8TVZ
--- In
<mailto:[email protected]>[email protected],
"JOHN MACKEY" <jmac...@...> wrote:
>
> Using balanced audio in a broadcast environment, I have on rare occasions
> experienced issues with cross-talk between long runs of
un-shielded balanced
> audio lines. (inductive pickup??) I always wondered if the
wires were truly
> balanced when that happened.
>
> I prefer to used shielded balanced wiring for long runs.
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