ORIGINAL MESSAGE:
On Sun, 23 Dec 2012 11:22:21 -0500, you wrote:
>
>W8JI says that shorting turns on a toroid is not a good thing to do. He said
>that shorted turns on an air coil cause much less of a problem because there
>is considerable flux leakage on the air coil.
REPLY:
W8JI is correct. Another way of explaining it is that on a toroid,
every turn is tightly coupled to every other turn. On an air core
coil, especially a long one, the tightest coupling is between turns
right next to each other. A turn at one end of the coil barely "sees"
a turn at the other end. Essentially, you have a string of one turn
coils in series. Don't take that literally - there is some coupling to
turns farther away, but it illustrates the point.
73, Bill W6WRT
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