Re: secondary core other than air

["Garry F." <garryfre-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

I often thought the reason telsa coils were air core was because Ferrite
might not be capable of rapid magnetic change that would be required for a
high frequency app such as tesla coils. I think the atoms would not be able
to spring back into their original orientation once the magentic field
collapes fast enough.

I could be wrong tho, but I tend to think this is why they reccommend only
non-magnetic wire as conductors in Tesla coils

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, August 06, 2000 2:04 PM
Subject: Re: secondary core other than air


> Original poster: Terry Fritz <twftesla-at-uswest-dot-net>
>
> Hi Garth,
>
>         #21 enameled magnet wire is about 33.1 turns per inch.  So you
probably
> have #21 which is fine.
>
>         Don't worry about only 5 turns on the primary.  Just tune your
coil
> with
> what you have and all should work fine.
>
>         I don't know of any way of lowering the secondary frequency short
of a
> bigger or more top load.  Ferrites in or around the secondary are not
> impossible, but that would take a lot of thought and design.  Perhaps a
fun
> project but too messy in this case.  Just tune with what you have and all
will
> be well.
>
> Cheers,
>
>         Terry
>
>
> At 03:09 PM 8/6/00 +0200, you wrote:
> >
> > Would it be possible to use something other than an air core to increase
the
> > secondary inductance and Q factor?
> >
> > Are their any possible cores available?  I know something like ferrite
core
> > would create internal arcs, but surely there must be something out
there!
> >
> > I have just wound my 6.4" secondary with what I was told to be #24 wire,
but
> > wintesla seems to use incorrect figures for wire guage and turns per
inch.
> > My secondary has 33 turns/inch.
> >
> > My secondary inductance is way too low and I now have re-calculated my
> > primary with only 5 turns which I think will be terrible for spark gap
> > losses.  My topload is 20" wide so I can't drop secondary resonance any
more
> > unless I use some secondary core other than air or wind more turns on
the
> > secondary.
>
>
>
>