Re: secondary core other than air

[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.