In message <c5f92539.3d5ef%[email protected]>, dated Wed, 1 Apr 2009, Ken Javor <[email protected]> writes:
>Mr. Woodgate cited the need for the cable-under-test (CUT) to be a 150 >Ohm transmission line. That is also my recollection of the >requirement. But it is problematical. The equation for the >characteristic impedance of a wire above a ground plane is (assuming >air dielectric): All that you wrote is true, except that the 10 cm requirement is for the EUT itself: the requirement for cables is much looser. But I still think the 10 cm is related, by magic or something, not electronics, to the 150 ohm idea. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
