[SI-LIST] Re: Coaxial Cable crosstalk
- From: "Joachim Mueller" <jmueller@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx, deibele@xxxxxxx
- Date: Tue, 5 Feb 2002 17:04:53 +0100
You probably have a common impedance problem and not a field coupling
problem, this is due to the fact that your coax cable share the same ground
reference. Clayton Paul explains the details of the effect in his book
'Introduction to Electromagnetic Compatibility'. At low frequencies you can
draw the equivalent circuit of a multiconductor transmission line with a
lumped impedance assigned to each signal wire and the shields, the
impedance of the common ground will cause voltage to be coupled from an
active line to a quiet line. This can be easily calculated based on basic
circuit theory.
Joachim
-- - --
Joachim Mueller
EMC/SI-Engineer, W.L.Gore & Associates
Nordring 1
91785 Pleinfeld
Germany
Phone: +49 9144 6016368
Email: joachim_mueller@xxxxxxxxxx
C Deibele
<deibele@xxxxxxx> To: jeff.w.loyer@xxxxxxxxx
Sent by: cc: si-list@xxxxxxxxxxxxx
si-list-bounce@fre Subject: [SI-LIST] Re: Coaxial
Cable crosstalk
elists.org
05.02.02 16:21
Please respond to
deibele
"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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