William,
If you want to calculate the impedance, the equation for a lossless line is
simply
Z = sqrt(l/c)
where
l = per unit length inductance
c = per unit length capacitance.
For lossy line, it gets more complex:
Z = sqrt((r+jwl)/(g+jwc))
where unit length parameters are
r = resistance (series, as a function of frequency)
w = radian frequency
g = conductance (line to line)
DB
> ----------
> From: wo...@sensormatic.com[SMTP:wo...@sensormatic.com]
> Reply To: wo...@sensormatic.com
> Sent: Thursday, January 11, 2001 8:25 AM
> To: emc-p...@majordomo.ieee.org
> Subject: RE: Zo
>
>
> My experience is that it is in the order of 75-150 ohms and depends upon the
> material, lay and shielding, if any. Increased lay and shielding will reduce
> the impedance.
>
> Richard Woods
>
> ----------
> From: William D'Orazio [SMTP:dora...@cae.ca]
> Sent: Thursday, January 11, 2001 9:49 AM
> To: EMC Posting (E-mail)
> 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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