Did you find out what you need?
Somewhere around here I have the equations that closely approximate twisted
pair for 26 Awg and 28 Awg wire from DC to 10MHz. They were derived from
empirical modeling. You can make various approximations to simplify their
use.
That includes impedance, loss per length vs frequency, etc.
I don't think they take into account being close to conductors, like a
shield, or crosstalk between pairs, because that's another analysis, but
they're *extremely* useful for predicting attenuation versus frequency for
analyzing the expected performance one will get from DSL modems.
- Robert -
Robert A. Macy, PE m...@california.com
408 286 3985 fx 408 297 9121
AJM International Electronics Consultants
619 North First St, San Jose, CA 95112
-----Original Message-----
From: William D'Orazio <dora...@cae.ca>
To: EMC Posting (E-mail) <emc-p...@majordomo.ieee.org>
List-Post: emc-pstc@listserv.ieee.org
Date: Thursday, January 11, 2001 7:20 AM
Subject: Zo
>
>Does anybody know the characteristic impedance of a twisted pair?
>Thanks in advance,
>
> <<...OLE_Obj...>>
>
>William D'Orazio
>CAE Electronics Ltd.
>Electrical System Designer
>
>Phone: (514) 341-2000 (X4555)
>Fax: (514)340-5552
>Email: dora...@cae.ca
>
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