On Mon, 2007-09-24 at 19:08 -0500, John Griessen wrote: > not supposed to let any traces cross the > > moat.) > > > That last sounds like a spell...skip it.
Isn't that one because the impedance of a track changes abruptly as it passes a cutout in the ground plane - causing signal degradation due to reflections, and perhaps return currents not being able to flow underneath the signal track in the plane? Anyway - seems this would only matter for fast edged signals. > It has to have a reason -- like keep the application circuit traces > out of the moat... > Not all... > > John G -- Peter Clifton Electrical Engineering Division, Engineering Department, University of Cambridge, 9, JJ Thomson Avenue, Cambridge CB3 0FA Tel: +44 (0)7729 980173 - (No signal in the lab!) _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user