Oh my. It is time for a story. My students use superb oscilloscopes that
are actually computers with a D-to-A converter used to display waveforms.
When measuring things such as the peak-to-peak size of a periodic waveform,
students (being students) initially writedown the number exported by the
oscilloscope. Whereupon, I ask the student if they wrote the computer code
that exported the number and, if not, why did they believe the result. The
student is sent back to note the max. and min. value, and to perform the
reliable calculation of subtraction.

NEC source code exists, is understandable, and has been verified many
times by independent persons. I teach my students to avoid using tools that
can not be verified at a fundamental level. Of course, rules-of-thumb are
an important part of error checking, and somethings are only amiable of
being approximated with a heuristic equation.

Mac N8TT

--
J. Mc Laughlin; Michigan U.S.A.
Home:

"Reg Edwards"
snip

My formula takes a few milliseconds to calculate. Whereas your method
requires a 4-weeks training course and several hours making the model.
----
Reg,G4FGQ