"K7ITM" wrote in message
ups.com...
Additional comment: if you write impedance files in standard network
analyzer format, they can be used by a lot of programs.

Good idea Tom. Roy: Besides RFSim99, Agilent's free AppCAD program has a
mode where it can overlay a set of data on a Smith chart, having read it
from the Touchstone ("standard network analyzer format") files.