[Amps] hf-2500

[Larry Benko]

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
>