Gary,
Nothing is black and white! Just because someone says something there
is always more to the story. Air (u=1) definitely has considerable flux
leakage. Obviously as the permeability goes up so does the coupling.
It is clear to me that the line between lots of flux leakage (u=1) and
virtually none (u=100s) there is a gradual increase in coupling. For
u=6 or u=10 shorted turns are not a clear NO but a qualified
no/yes/maybe. I saw a slight increase in heating with shorted turns but
not a catastrophic increase. A good designer would take this into
consideration.
73,
Larry, W0QE
On 12/23/2012 9:22 AM, Gary Schafer 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.
73
Gary K4FMX
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