Mailing List flyrotary@lancaironline.net Message #55632
From: Tracy <rwstracy@gmail.com>
Subject: Re: [FlyRotary] Re: sheilded plug wires
Date: Sat, 9 Jul 2011 09:28:03 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In this case "shielded" is the wrong term.   The spiral wire does not actually shield the noise, it prevents the noise from being transmitted.    It acts as an inductor to prevent the propagation of the noise generated at the spark gap from propagating up the wire.

Tracy

Sent from my iPad

On Jul 9, 2011, at 2:09 AM, Lehanover@aol.com wrote:

It has to do with the resistance of the long thin Monel wire. An impedance mismatch and inductive reactance. What the mechanism is I do not know. That is why Tracy is here, to explain such matters.
 
Lynn E. Hanover
 
In a message dated 7/8/2011 11:08:09 P.M. Paraguay Standard Time, SBoese@uwyo.edu writes:
My last massage got a little garbled, the way I have my wires configured now, the conductor and spiral wrap are exposed and folded under the crimped teminal ends, so aren't both the conductor and the spiral wrap acting as a conductor? What is doing the shielding?
 
Brian Trubee
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