[Amps] hf-2500

[Carl]

There is a big difference between a multiband toroid up thru 10M and another 
for just 80/160 as we have been discussing.
>From a packaging constraint a properly sized toroid is an acceptable 
compromise to many.

Carl
KM1H


----- Original Message ----- 
From: "Gary Schafer" <garyschafer at comcast.net>
To: "'Larry Benko'" <xxw0qe at comcast.net>
Cc: <amps at contesting.com>
Sent: Sunday, December 23, 2012 1:22 PM
Subject: Re: [Amps] hf-2500


> 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
>> >
>
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