Look at the tables in the ARRL Handbook, in 2003 it was in Chapter 24, for
tables with the info you need to calculate the inductance on a given core
with a certain number of windings. You need to solve for AL obviously since
you want to find your core.

Uwe

in article , J Shrum at
wrote on 4/21/04 18:55:

Greetings,

Recently I bought a grab bag of mixed toroids from www.allelectronics.com .
I bought some T-37's and T-50's. The problem is... they're not color coded,
and not identified by mix. So I have mystery toroids T-37-?? and T-50-??...

The question is, is there a way to come up w/ a rough estimate of the mix
value? I wound some test coils and come up w/ these figures:

T-50 15turns 30awg = ~150uH
T-37 9turns 30awg = ~180uH

Perhaps there is a chart or something similar somewhere that I have
overlooked that will give me an idea.

Thanks for all assistance.

Jim Shrum - KC9FFX