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Greetings Chip,
It's been a bit since I've "chipped" in with a response however my
concern is that with the existing email system I have been able to save
most emails to my hard drive via my client (Thunderbird). I have
thousands of past emails which I am able to search through off-line.
Will a forum approach allow me to continue to collect my data base?
Just bringing this up for consideration.
steve-seattle
Here is my first saved email from when I joined the list in 1996:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Subject: Frequency calculations
>From gowin@xxxxxxxxxxxxxxxxxxxxxxxxxxx Fri Dec 13 11:58:50 1996
Date: Fri, 13 Dec 1996 08:59:12 -0500
From: Dan Gowin<gowin@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
To:tesla@xxxxxxxxxx
Subject: Re: Frequency calculations
Tesla List wrote:
>From Esondrmn@xxxxxxx Thu Dec 12 14:39:51 1996
Date: Thu, 12 Dec 1996 12:51:00 -0500
From:Esondrmn@xxxxxxx
To:tesla@xxxxxxxxxx
Subject: Frequency calculations
All,
There was a Tesla Math Formulary published on this list on 8-10-95 - courtesy
of Richard Quick I believe. I was doing some calculations last night on my
new small coil and found a problem with equation # 6: Frequency of Coil. The
formula given is: F=300,000 / T x W x pi x (.9144 / 36) x 4 where f =
frequency of the coil in khz, T = number of turns, W = width of the coil in
inches.
Using this formula, I get a number quite a bit lower (like 40 or 5% lower)
than I get using wheelers equation, caclulating the self capacitance then
calculating the resonate frequency . I have measured the inductance of my
present coil and the self capacitance and the frequency and know these other
methods work as they should.
Has anyone else tried using this formula?
Ed Sonderman
Ed,
In Foster's book on elctromagnetics I use the formulae
designed for circular pole antanae. And, Brent turner uses the
same formula in his book. But It's probably a good idea to calculate
your coils parameters ten ways from sunday. Sorry, I have not
used the "Richard Q." equation.
1.75(h/d)^0.2
----------------
(1*10^9) (Fr*d) = Nt
h = height of coil
d = diameter of coil
Fr = Frequency your shooting for
Nt = Number of turns
Hope this helps.
D. Gowin
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