[RFI] Fair Rite #31 Mix Material

[Paul Christensen]

The closest core size I can find in #31 material is the Fair-Rite P/N 
2631480102.  That's a half-inch in diamter, but it's also a whopping 
half-inch in depth.  So the thickness of the toroid core is the same size as 
the diameter.  I think I can make that work, but I am curious as to why 
Fair-Rite has no cores in the traditional thickness and diameter sizes.   Is 
it because the #31 mix needs more material per comparative volume of space 
to be effective?  Those traditional core sizes all appear together in the 
Fair-Rite catalog but they are limited to 67, 61, 43, 77, 75, 76, and 85 mix 
material.

Paul, W9AC