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[Amps] slug tuned variable inductors

To: <amps@contesting.com>
Subject: [Amps] slug tuned variable inductors
From: "Joe Brown" <joe.brown@gordmans.com>
Date: Wed, 16 Feb 2005 15:14:29 -0600
List-post: <mailto:amps@contesting.com>
Is it possible to use slug tuned coils with any reasonable power? I am thinking 
of moving a ferrite slug in and out of a coil to change the inductance, but 
don't know if it would be too lossy at real power? Is there a type of ferrite 
that could be used for this at HF? Or is this just a goofy idea. I want to get 
rid of the roller inductor in my homebrew antenna tuner.

I read an article in an old Ham Radio magazine about a tank circuit for a 
commercial 5KW amp, and they lowered the inductance by moving a shorted turn ( 
a piece of copper pipe) in and out of the tank coil. Wondering if can do the 
same thing with ferrite.

73, Joe W0DB
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