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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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"
