I've written a program to analyze common-mode current in an antenna
system. I think the required measurements for an antenna on a tower or
mast will be too much trouble for nearly everyone. But they should not
be difficult for an antenna with a feedpoint near ground, such as an
end-fed halfwave or a vertical.
I'm hoping the program may provide insight for intractable common-mode
problems, but that may be expecting too much.
https://k6sti.neocities.org/cm.htm
I just whipped this up in the last day. Check the date at the end of the
writeup. If it changes, there's a new version available.
Use my s-parameter plotter to view program results:
https://k6sti.neocities.org/splot.htm
Brian
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