Jim,
This one may be of interest:
http://hamwaves.com/antennas/inductance.html
It's the most accurate I've found. To quote the web page:
"The inductor calculator presented on this page is unique in that it
/employs the n=0 sheath helix waveguide mode to determine the inductance
of a coil,/ irrespective of its electrical length. This allows for more
accurate inductance predictions at high frequencies. Furthermore, /the
calculator closely follows the National Institute of Standards and
Technology (NIST) methodology/ for applying round wire and
non-uniformity correction factors and /takes into account both the
proximity effect and the skin effect."
/Good luck!
Steve G3TXQ/
/
On 31/07/2015 18:43, Jim Brown wrote:
Thanks, Jim. All comments appreciated. Do you know of any good
calculators online that run through the equations for single layer
coils like this? N6BV pointed me to http://www.zerobeat.net/G4FGQ/
which yielded a DOS program called SOLNOID3.EXE that computes things
like self-resonance, dissipation, and so on. I had to resurrect an old
computer to run it. Many years ago, I wrote a QPro calc for the
classic equations in the Handbook, which I found to correlate nicely
with what I built.
73, Jim
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