Re: Tesla calculator frustration.

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Esondrmn-at-aol-dot-com>

In a message dated 5/30/01 3:54:27 PM Pacific Daylight Time, tesla-at-pupman-dot-com 
writes:

<< 
 This really should be quite simple, but no...
 
 I just want to calculate where I *should* tap my primary, given the
 following:
 Cap: 0.06uF
 Primary: Inner diameter = 9.75", 1/2" spacing (center to center), 1/4"
 tubing
 Secondary: 1000 turns, 27.625" winding length, 6.625" diameter.
 Topload: 8" chord, 23.5" center to center (capacitance = 34.845?)
 
 
 Previously (with a smaller topload), I managed (or so I thought) to do
 the calculation using JHCTES version 3.2, at
 http://www.miramarcollege-dot-net/faculty/jcouture/tesla/
 
 but now I can't see how I ever did it.  The weird thing here is that
 what I would logically like to specify as input parameters, like primary
 interturn spacing, are output parameters.  I have to try to adjust the
 input parameters to get output parameters that match my existing
 primary.  
 
 I've also tried E-Tesla 5 and 6 - got significantly different results,
 and don't quite see how to calculate my tap point anyway.
 
 Are the specs I've listed sufficient for calculating the tap point?
 
 
 Another question, about toroid topload shape:  I made mine from 8" dryer
 duct and two 16" pizza pans, but the pizza pans are about 4" apart. 
 Should that be a problem?  Any idea how much that affects the toploads
 capacitance?
 
    Thanks again,
    Bill V.
  >>
Bill,

Your secondary is almost the same size as mine.  I ran some calcs.  My coil 
uses #22 wire which I have plugged in at 37 turns per inch.  You did not say 
on wire size so I adjusted it to 36 turns per inch to get 1,000 turns.  34 pf 
sounds about right for the toroid.  I calculate that it should tune when 
tapped at about 7.5 turns.  My coil uses a larger toroid, .05 ufd capacitance 
and tunes at turn 9.75.

Ed Sonderman