Curious ... what formula does STLcalc use?
Here is a discussion where the Kraus equation has been found to be incorrect in yielding the loop feedpoint Z.
https://forums.qrz.com/index.php?threads/empirical-evidence-and-the-scientific-method.641240/page-4
Note, the discussion continues onto the next few pages (like page 5) on the QRZ website.
Many websites, many loop calculators still seem to use the Kraus loop equation as the basis for their results.
I have moved on from using loop calculator programs for much of anything any more, preferring to use
real-world measured 'data' using the now ubiquitous antenna analyzer we all have in our possession.
73,
de Jim AA5CT
