Use program TOROID from website below.

Enter into the program the data you already have, core dimensions and
inductance, and the remaining information such as core permeability, the
number of turns for other inductances, will be computed.

Program avoids guessing who is the manufacturer. Who needs to know if you
have already grab-bagged the items.

From inductance/number-of-turns data you can guess the type of material,
ferrite or iron powder, if you are interested.

Download program TOROID in a few seconds and run immediately.
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Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
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