Re: Copper Banding?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>

On 1 Mar 2005, at 10:47, Tesla list wrote:

> Original poster: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>
>
> Scott: The diferance of inductance is caused by various factors. The
> spacing is first, second is capacitance. If a coil is thin wire the
> capacitance between the windings is low. With banding the surface area
> between the windings is high so the capacitance is high. Capacitance
> is out of phase with inductance and tends to counter act. The total
> coil capacitance then reacts with the external capacitance all
> shifting the total resonant frequency acting as though the inductance
> is changed.
>     Robert   H

The problem I see with that explanation is that the discrepancy
remains for flat sheet as well as a coil. Ground planes are used in
HF printed circuit board apps to take advantage of the lower
inductance aren't they?

Malcolm

> --
>
>
>  > From: "Tesla list" <tesla@xxxxxxxxxx>
>  > Date: Mon, 28 Feb 2005 09:51:51 -0700
>  > To: tesla@xxxxxxxxxx
>  > Subject: Re: Copper Banding?
>  > Resent-From: tesla@xxxxxxxxxx
>  > Resent-Date: Mon, 28 Feb 2005 09:52:12 -0700 (MST)
>  >
>  > Original poster: BunnyKiller <bunikllr@xxxxxxx>
>  >
>  > hmmmm...   for some unknown reason to me I would have to say no   (
>  just a > gut feeling) the dia of the primary would be quite different
>  plus you have > a higher "density" of turns per equalvailent
>  radius... > > I suppose it would be like wrapping a secondary with
>  1000 feet of #30 wire > compared to #20 wire..  the #20 secondary
>  would be quite a bit > taller   thus a different L. > > Scot D > > >
>  > Tesla list wrote: > >> Original poster: "david baehr"
>  <dfb25@xxxxxxxxxxx> >> >> >> In a previouse post, it was stated that
>  a banded pri. would have less >> inductance than a copper tubing pri.
>  Could someone explain this ? IF YA >> got 50' of copper tubing , and
>  50' of banded pri. , wouldnt be about the >> same ????????//// >> > >
>  > >
>
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>