Don't know if this has been posted before, but I found a useful WEB site
run by Jack GM0RWU (ex GM7ISS).
He has an onlive JAVA application that allows you to design toroid coils.
You type in the desired inductance and select a toroid size and mix from
a menu. Hit return and you are instantly rewarded with the required number
of turns, the calculated inductance value, the maximum wire size,
and a color picture of the toroid core with the required number of windings.
You can get to this tool at:
http://www.chemeng.ed.ac.uk/people/jack/personal/radio/design_toroid.html
He also has a coil designer program there too. You specify the desired
inductance, coil diameter in inches, and either the coil length in inches
OR the wire size in swg (British standard wire gauge). Push a button
and you get the required number of turns for the coil.
This tool is at:
http://www.chemeng.ed.ac.uk/people/jack/personal/radio/coil.html
72, Ray WB6TPU
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