RE: Specs inquiry for all

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

Original poster: "John H. Couture" <couturejh-at-mgte-dot-com> 


Brett -

You can find the correct toroid for your TC with the program shown below.
You can get more data from JAVATC but the JHCTES is quicker.

For the past 15 years whenever a coiler posted his TC specs on the List I
would run the numbers thru the JHCTES TC computer program. I was especially
interested in the real world test numbers to see how they compared with the
program. This is the true indication of the worth of a TC computer program
when it can reasonably predict how the TC will perform. The problem was that
the tests the coiler made did not always agree with the program. This means
either the program is wrong or the test are wrong. In the past it was
difficult to convince the coiler that the program may be correct and that
his test were not.

I ran the numbers from your specs and found that they were very close to the
JHCTES program. The inputs I used were

  Primary     .0124   8.00   00   7.1

  Secondary  3.13   1031   42.96   00   18.7

The above is for the 4" x 17" toroid. For other toroids you only have to
change the input for the secondary terminal and click "Calculate". The
computer will change all of the proper outputs to keep the TC in tune. If
you run the above input numbers in the program you will find that the
outputs are amazingly close to what you found in your tests. The original
program showed .191 for the coupling. This is still being studied. It is
obvious that your skills (5 years ago) in building and testing Tesla coils
were very good.

The program can be found at    http://mgte-dot-com

Click on Tesla then JHCTES (Books). At bottom of book page click on JHCTES
Ver 3.42

John Couture

----------------------------------


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Monday, January 26, 2004 6:45 PM
To: tesla-at-pupman-dot-com
Subject: Re: Specs inquiry for all


Original poster: Brett Miller <brmtesla2-at-yahoo-dot-com>

Luke,

When I first started construction of my 6" coil (about 5 years ago), I
foolishly put together a huge toroid which was slated to sit atop the
finished coil...lacking the experience to know in what order I should have
been proceeding, I did not know that the toroid matching should be
undertaken last.  This large toroid was over 36" in diameter with a 4"
minor.  I have gotten the best results with the *much* smaller 4 x 17"
dryer duct toroid atop an even smaller ACR (anti corona ring).  To this day
I haven't gotten long or hot streamers from that huge toroid, even with a
breakout point.  This is probably due to the fact that I am lacking
sufficient turns in the primary to tune using that big toroid.
I am planning on redesigning my primary soon and using the modern pancake
configuration, and will allow for around 20 turns or more for flexibility
in research.  Then I will be able to test out the aforementioned.  Of
course, one could easily model such a thing (maybe not the breakout, but
definately the tuning) with a program such as JavaTC.

Here are my specs:

<http://hot-streamer-dot-com/brett/6inchcoil/6inch.txt>http://hot-streamer-dot-com/b
rett/6inchcoil/6inch.txt

I have often thought it peculiar that I use a smaller toroid than most
folks, but still
manage decent power processing and long arcs.  I have noticed some
exceptions however...enough to keep me from really worrying about it a
whole lot.  It would be nice though, if someday we had software which could
calculate a nice toroid for "big arcs" for a given coil spec.

-Brett

Tesla list <tesla-at-pupman-dot-com> wrote:
Original poster: "Luke"

I was wondering if anyone has built a system that works well and then
changed to a Single toroid for the top that was large enough that it
prevented break out when no break out point was provided. Or anyone that
has designed a system that tunes up and works good but need a break out
point to get their system to break out, again, using a single toroid as the
top load.

I am sure there are those out there that have done this.

Would such people be willing to respond with some specs of their systems?
<SNIP>