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Re: JHCTES Ver 3.1 Program

To All -

The website has been upgraded. If you have had trouble downloading the
program give it another try. Click on


To obtain the most benefit from the program the following steps are

1. Enter the power transformer data. The output volts, milliamps, etc. The
wattage is an output. If you are using a NST with a primary cap that gives
resonant charging increase the milliamps which will increase the wattage and
spark length. The spark lengths are for random streamers in air. Controlled
sparks would be shorter.

2. Design the Secondary Circuit. Enter the secondary Radius and Turns you
want to use. The Turns per inch (TPI) for the secondary wire can be found in
tables in several publications including my books. Or if you have the wire
you can wind a couple inches on a dowel and count the turns. The Wire Size
is for record only. The secondary design determines the TC operating
frequency. The program automatically tunes the primary circuit to this

3. Secondary Terminal - This input affects the operating frequency and other
parameters of the coil. There is a graph in one of my books that gives the
capacitance for spheres and toroids. The books also give equations to
calculate these capacitances. This information is also available in other
publications. It is important to have this parameter as an input because the
sphere/toroid can be used to change the operating frequency and tune the TC
system. The graph (free space) capacitance changes slightly when the
sphere/toroid is placed on the secondary coil.

4. Design the Primary Circuit - Select the primary capacitor. There are
graphs in my books that show recommended capacitor sizes for different input
wattages. The number of primary wire turns (output) is calculated by the
computer and will depend on the primary capacitor size and the operating
frequency.  Adjust the Average Radius Rp to give the "Primary to Secondary
Clearance" you want in the output. Adjust the Width of Turns (spiral) to
give the "center to center wire/tube spacing" you want in the output.

The computer will calculate the inside radius and the outside radius of the
coil . Note that all of the physical dimensions of the coil affect the
number of turns which are coordinated and calculated by the computer. These
dimensions are also calculated by the computer to give the proper inductance
so the primary circuit will be in tune with the the secondary circuit at the
proper operating frequency at all times.

5. You can click the CALCULATE button at any time and the computer will do
the calculations necessary and show you the latest outputs for the latest
changes. The coil parameters have been carefully selected to give the
maximum output information with the minimum input data. The program can be
used to check the coils of other coilers when they provide part or all of
the data.

I would be interested in your comments to improve the program.

John H. Couture