The braid looks pretty tight to me, but since real coax is always coated with opaque insulation, I can't make a direct comparison. If it were a "leaky coax" effect, would I be able to pick that up with a current probe placed around the cable? If I compared the current probe reading from a leaky coax to a good one, could I see the difference that way?
---------- >From: Cortland Richmond <[email protected]> >To: Ken Javor <[email protected]>, ieee pstc list <[email protected]> >Subject: Re: Stumped >Date: Tue, Oct 15, 2002, 12:59 PM > > Now that I've re-read the message, I see where you are coming from. > > I thought you were looking at common-mode loss of the cable (as a whole, > shield included) *above ground*; you are looking at the center conductor > common mode with respect to the overshield, almost as a coaxial cable > itself. Yes, that seems a reasonable impedance for that configuration. > > Loss is from the conductor and from the dielectric. You have a relatively > large, low-loss conductor -- but due to its high capacitance, I'd expect > dielectric loss to predominate in the setup you are using. > > A question about the braid; you said it appears to be Kapton coated. Could > it be that braid conductors are not making intimate contact with each > other? In that case, radiation loss could still be a large part of what you > saw. > > > > Cortland > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
