It seems to me to be impractical to drill a toroid, such as I heard a
warning once that they SHATTER if dropped. Wouldn't the stress of
drilling possibly cause this, too?
My thoughts, since I have built a few Heathkits, and there are a few
hints in their construction. Yes, one turn is going through the center.
The half turn should then be on the outside of the toroid. For example,
do a 5 turn with tap at 2-1/2 turns. Pass the wire through 2 times.
Scrape, twist, or whatever to make an attachment on the outside of the
toroid before making pass three, and pass the rest of the times (3)
through the center.
Makes more sense to me, and may be safer. Of course, this means that the
tap must be at least 1-1/2 turns from either end. If you need the
inductance of a 1/2 turn, use another method, such as another core type
or AIR.
Hope tha verbal explanation does it.
Douglas L. Datwyler WR7O DN40bo Sandy, UT datwyler@aros.net
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