4nec2 wrote:
Somehow, and using Nec2, I seem not always able to get expected
impedance values when using the results produced by L.B. Cebik's stub
matching software at http://www.cebik.com/trans/ant-match.html

Does anybody know a source for (similar) stub matching software
(freeware or evaluation), so I can check where things go wrong ?

Thanks in advance,
Arie.

Arie,

If you are using the 1/4 wavelength series section worksheet, there is
a factor of four error. Instead of calculating a 1/4 wavelength line,
it calculates a full wavelength. If you will divide each of the values
in cells G10 through G12 by 4 you will get the correct line length.

The Beta matching worksheet seems to be correct. I use stub matching
on my 20-meter Yagi and the modeled values and my measured values are
remarkably close. The stub length given in the worksheet correlates
fine with the model.

Regards,

Wes N7WS