Should linear size (1/2" O.D., by 1/4" I.D.
> toroids, 1-1/2 length) be multiplied by 10 or 15 or core *volume*?
Angel Vilaseca HB9SLV
Will Matney wrote:
>
> It's possible but it would be one heck of a big slug. The material type
> and the cross sectional area of the core, which is governed by the power,
> is what you have to follow. One can figure this area by using the satndard
> formulas for calculating the area with maximum flux density, frequency,
> and power throughput. The max. flux density is really low in ferrite thus
> a big (huge) core is required. There are also powdered iron cores that can
> be used here with similar formulas. Most ferrite and powdered iron
> manufacturers have these formulas in their catalogs or on their websites.
> There are some silicon steel tape wound cores claimed to work into the HF
> band but I'm not experienced with any. I read about this for one type of
> Hipersil or Silectron material that used tape as thing a 1 mil. One ruff
> idea on the size, in small mobile amps, the output transformer has a total
> core length of about 3 inches at least made of 1/2" O.D., by 1/4" I.D.
> toroids, 1-1/2 length to a side for roughly 100 watts output. Take this
> size and multiply it by 10 or 15 to handle 1000 to 1500 watts.
>
> Will
>
> On Wed, 16 Feb 2005 15:14:29 -0600, Joe Brown <joe.brown@gordmans.com>
> wrote:
>
> > 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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