Re: Primary

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>

Hi Dennis,

The tubing and turn to turn spacing is fine.  The voltage from turn to turn
is far lower than the total NST voltage.  Mine is spaced at 1/8 inch but
that is pretty tight and requires great care in building.  Try and get as
many primary turns as possible so you will be able to tune anything you
want including future projects.

I use wood but I live in a dry climate.  Plastics are best but more money.
I would use the processed partical board before bare wood since is is dried
compressed glued etc.  It looses a lot of conductivity in all that.  You
can always test a bit with your NST.

The 2 1/2 inches spacing concerns me.  I have 1 inch spacing between the
inside of my primaries and the secondaries.  However, 1 1/2 inches is
probably best.  I build the coil so that the primary and first turn of the
secondary are level with each other.  If I need to lower the coupling, I
can then raise the secondary a bit.  If you make it with 2 1/2 inches
already, it would be hard to lower it if you wanted.

Cheers,

	Terry


At 10:40 AM 1/30/2001 -0500, you wrote:
>Hi everyone!
>I'm about to start on my primary and wanted to run some numbers past you all. 
>First I have a 15/30 and I'm going to use 1/4 inch copper tubing (refrige) 
>spaced at about quarter inch. Oh yeah, 2 1/2 inches between the secondary and 
>first turn of primary. Does this sound reasonable?? Is the turn spacing too 
>close? I read somewhere that You could use that perforated particle board, 
>but it seems to me that it would arc along the board (it happened with 
>regular wood). 
>Any suggestions?
>Thanks,
>Dennis
>