[SI-LIST] Re: Coaxial Cable crosstalk
- From: "Charles Grasso" <cgrassosprint1@xxxxxxxxxxxxx>
- To: <deibele@xxxxxxx>, <jeff.w.loyer@xxxxxxxxx>
- Date: Tue, 5 Feb 2002 08:34:08 -0700
The limiting factor in a coax design will be
its terminations not the cable itself in the
first order. SO I would not expect much
xtalk between two coax cables
What you are describing Craig is a little different.
If you jump onto Doug Smiths website (www.dsmith.org) or go to
one of his seminars, you'll find a nice proof that
the coax actually acts as a transformer and simply
transfers noise on the shield right onto the signal.
This is the effect you're looking for I think
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of C Deibele
Sent: Tuesday, February 05, 2002 8:22 AM
To: jeff.w.loyer@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Coaxial Cable crosstalk
"Loyer, Jeff W" wrote:
>
> ok, I'll take the bait...
>
> Isn't the crosstalk between 2 coax cables zero?
>
> Jeff Loyer
Bait? Bait? Come come Jeff.... <smile>
In a perfect world, the crosstalk is zero. In a real world, however,
there is crosstalk, unfortunately. While the crosstalk is small, this
may or may not impact you depending on the signal levels that you have.
Imagine the following scenario: You have a busbar, that is switched
on/off and 50 KHz, 2000 Amps. You have a piece of coax laying near the
busbar, that has 50 uV signals on it.
What do you think would happen to the signal on the coax? I would bet
in this case that the coax would have some signal from the busbar on it.
See what I am driving at?
Craig
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