Hi Steve,Thanks for the reminder. I'll make sure that the postings are available and if there is a limit on the forum, then will figure out some crawling way of doing it.
Thanks for sticking around so long! :-) Chip On Wed, 10 Mar 2021, steve date wrote:
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 1996Date: 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 - courtesyof Richard Quick I believe. I was doing some calculations last night on mynew small coil and found a problem with equation # 6: Frequency of Coil. Theformula 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 mypresent coil and the self capacitance and the frequency and know these othermethods work as they should. Has anyone else tried using this formula? Ed SondermanEd, 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 _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla
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