Hi Larry,
My problem was that of low efficiency and getting rid of the shorted turns
made quiet a difference. If I remember right the power out went up around
300 watts on 20 meters.
We had a discussion about this on AMPS a year or so ago. It should be in the
archives.
73
Gary K4FMX
> -----Original Message-----
> From: Larry Benko [mailto:xxw0qe@comcast.net]
> Sent: Sunday, December 23, 2012 1:08 PM
> To: garyschafer@comcast.net
> Cc: amps@contesting.com
> Subject: Re: [Amps] hf-2500
>
> 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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