RE: a check on specs please

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

Original poster: "Tom Luttrell PWRCOM" <tom-at-pwrcom-dot-com.au> 

Richard, I had the same problem with my 3" coil.

The 20AWG is a recommendation based on 6x skin depth at the resonant
freq.

24 AWG will be fine, the losses in the static spark gap will probably
swamp the small loss obtained by using thinner wire for the secondary.

Plus if you change the wire size you will have to change the secondary
diameter to maintain 1000 turns and a 4-5:1 H:D ratio. This will change
the resonant frequency, the skin depth and probably the wire
recommendation again!

40tpi is about right for 24AWG, I used "heavy" insulated magnet wire in
my calculations here: http://www.classictesla-dot-com/java/cst.html

25 inches should give about 1000t (~40tpi), using single insulation
thickness you'd get about ~1100t.

Tom L.

 > Original poster: "Richard Modistach" <hambone-at-dodo-dot-com.au>
 >
 > thanks for that tom,
 > just one question,
 > in the sec. inputs you've got my 24 guage wire
 > which i already have,
 > but on the sec. outputs it shows 20 guage wire
 > is to be used which means i have to buy some more
 > wire, would there be a way the specs could be
 > changed so i can use my 24 guage or is 20 guage
 > the only way to go if i want to get the best peformance
 > with my other parameters.
 > the other thing i just checked was the 40tpi, without
 > sounding too presumptious, may the 20 guage have
 > been a misprint for 24 guage in the secondary output
 > stats.