Date:         Sat, 27 Oct 2001 09:10:39 -0500
Reply-To:     Larry Alofs <lalofs@ENTERACT.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Larry Alofs <lalofs@ENTERACT.COM>
Subject:      Re: Ultimate Fix #1 (twisted wires?)
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Stan Wilder wrote:
If you make long runs of wire from the back to the front of your van
forinstruments that read mili-amp signals be sure that you don't twist the

> wire more than a turn or two during the run, higher current passing
> through adjacent wires can cause magnetic signals to be generated.
> Reference: Twisted TWX wires for signal light vehicle sensors are
> required to have a twist every six or eight inches to generate a magnetic
> pulse.

Huh??
  Twisted pairs of wire are used to *reduce* production and reception of
interfering signals in data transmission.  I don't think that the design of
vehicle traffic sensors is directly applicable here.  When running two wires
to a remote sensor I would twist them together perhaps once per foot.  Of
course a coaxial arrangement with an outer conductive shield provides better
signal protection for very low current signals like from an O2 sensor.

Larry A.