[TCML] Primary

[futuret at aol.com]

Stan,

What you can do, and what I would probably do, is to
set the bottom of the secondary a little *below* the plane
of the primary if needed to get tight enough coupling.
I did that a few times on various coils.  Works fine.

John
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-----Original Message-----
From: stanley miller <swm334 at yahoo.com>
To: tesla at pupman.com
Sent: Wed, 27 Aug 2008 5:00 pm
Subject: [TCML] Primary



Hi again guys,
 
I got my primary done today, and to my dismay half way thru realized 
the spacing
between primary and secondary was not going to be as I had calculated 
which was
to be 2" inches.  My problem is I started the first turn right at 2" 
and built
out from there so as it comes around I end up with about a 2 1/2" inch 
gap
between the primary and secondary.  I have read that the gap should be 
between 1
to 2" inches so this might be pushing it with a 15/30 nst.  Regardless 
I
finished winding it and it came out pretty good.  I did wind it with 
more turns
then necessary as I want to be able to use it in the future on a bigger 
ma rated
nst.  The secondary is already done it is 4" inch dia by 22'' with 24 
awg.
So my question is will I lose good coupling with this large of a gap?  
If so at
this point the easiest thing to change would be to make another 
secondary with a
bigger dia.  Any ideas? =2
0Thanks!
 
Stan  



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