For AWG 22, it's going to be at or below 70 Ohms.  For instance, 
MIL-STD-1553 implemented as a shielded twisted pair is around 72 Ohms, and
they do something extra to make it a "controlled-impedance twist."
Something like 300 Ohm twinax, where the wires are held apart a set
distance, except the distance is much less.

----------
>From: "William D'Orazio" <dora...@cae.ca>
>To: "EMC Posting (E-mail)" <emc-p...@majordomo.ieee.org>
>Subject: Zo
>Date: Thu, Jan 11, 2001, 8:49 AM
>

>
> 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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