[Amps] hf-2500

[Gary Schafer]

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 at comcast.net]
> Sent: Sunday, December 23, 2012 1:08 PM
> To: garyschafer at comcast.net
> Cc: amps at 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
> >