Re: what size wire?

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

Original poster: "BunnyKiller by way of Terry Fritz <twftesla-at-qwest-dot-net>" <bigfoo39-at-telocity-dot-com>

Tesla list wrote:

>Original poster: "Bob Thaden by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<robert.thaden-at-amd-dot-com>
>
>
>I'm building a coil 12.5" x 60".  Can anyone suggest the wire size I
>should use.  I was planning on using my 10# spool of 18g but I see that's
>not even half enough wire.  Has anyone used a mix of two diff sizes of
>magnet wire - if so, does the thicker wire go at the bottom, and how
>do you calc reson. freq?
>thanks
>bobt in Austin
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Hi Bob ...

I built a 12.5" dia secondary and used 2 different wire sizes on it.  I 
wound the lower 10" of the coil with # 10 solid copper ( since the 
current is higher at the bottom) and the rest with # 18 magnet wire.

as far as the tuning part , I measured the length of # 10 wire on the 
secondary ( 10" worth) and figured the number of turns. Then I measured 
the length of the #18 wire on the secondary and figured the number of 
turns for that portion.

the next step was to sum up the number of turns and consider that a 
total of # 18 wire turn wise and tune to that "length"..

it works for me :)

Scot D