[SI-LIST] two twinax cable shielding

From: C Deibele <deibele@xxxxxxx>
To: Si-List Si-List <si-list@xxxxxxxxxxxxx>
Date: Fri, 01 Feb 2002 13:23:14 -0500

Hi,

I have a question about what type of shielding/isolation that I can
expect to achieve with two twinax cables.  Note, this is low frequency
-- on the order of DC-1 MHz or so, and the driver twinax is run in
difference mode.  I would like to know is what type of signal I should
expect on a second twinax cable in the vicinity of the driver twinax.

I think that the main contribution would be sum mode (common mode) on
the second set of twinax cables - but I'd like some way to estimate it. 
I think there will be a contribution to difference mode on the receiver
cable.


The driver twinax has some mu in its outer cladding -- probably on the
order of 5 or so.


Does anyone know of a reference/rule of thumb I can use to estimate the
contribution to sum and to difference mode.

Thanks

Craig Deibele
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[SI-LIST] two twinax cable shielding

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