Re: R.A. Ford (book)?(update)

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

Original poster: "Luc by way of Terry Fritz <twftesla-at-uswest-dot-net>" <ludev-at-videotron.ca>

Hi,

I scan that table may be it's the table you looking for
 http://pages.infinit-dot-net/luc2/icr.gif
If it not what you're looking for, try to precised I have some old book.

Luc Benard

Tesla list wrote:

> Original poster: "ebyng by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<ebyng-at-netlimit-dot-com>
>
> Wait a min.......
>
> Ok, heres the problem with that........
>
> The actual chapter/quote is :
>
> Assume that the target frequency = 400 kilocycles
>
> Using the formulas for the L-C values, 400 Kcycles has a value of 0.1583
> for the product L-C where L is in microhenries and C is in microfarads.....
> the inductance L in microhenries is approx given as
> L= a2nd x n2nd/8a + 11w
> where W = width of coil
> A = average radius in inches as measured from the middle of the primary to
> the center of the secondary.
> N = number of turns in the primary coil.......
>
> then, if L = 61.5 microhenries
>
> C = 0.1583/61.5
>
> and C will = 0.0026 microfarads.
>
> Okayyy, so thats the reprint, cut into small sections.
>
> so what he's trying to do is find capacitance that will create a frequency
> of about 400 Kc.
>
> So if your solving to find capacitance, you cant use
> wavelength=1884 x sqrt(LC)   freq=300,000,000/wavelength (in meters), L in
> microhenries, C in microfarads.
>
> because you dont have a specific capacitance(yet).
>
> I can see how you would reverse engineer this to find the frequency that
> your coil is running at, but how does this way work???
> Thanks
> S
>
>
> ----------------------------------------------
> Original Message
> From: "Tesla list"<tesla-at-pupman-dot-com>
> Subject: Re: R.A. Ford (book)?
> Date: Wed, 14 Mar 2001 11:52:19 -0700
>
> >Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <jimlux-at-earthlink-dot-net>
> >
> >
> >> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> ><Mddeming-at-aol-dot-com>
> >>
> >> In a message dated 3/14/01 12:49:47 AM Eastern Standard Time,
> >> tesla-at-pupman-dot-com writes:
> >> >
> >> > Anyway. I would love to get my hands on that table, to see if that
> >works.
> >> > He's calculating a coil to run on a specific frequency in that chapter.
> >> >
> >> > If anyone has that book or that table, could I get a scan. copy. email
> >> > whatever of it??
> >> >
> >>
> >>
> >>
> >> CRC 34th Ed. is from 1952. In the 36th edition (1954) the table is on
> >pages
> >> 2973-75. By 1974 the table had been dropped from the handbook since by
> >then
> >> any 5-function calculator could reproduce the data. The table does not
> >give
> >> specific values for L  and C, but only for the product ( L x C) You can
> >> generate this table in any spreadsheet using the same formula they did:
> >> wavelength=1884 x sqrt(LC)   freq=300,000,000/wavelength (in meters), L
> in
> >> microhenries, C in microfarads.
> >>
> >
> >Just to be a bit picky.. If you are using Excel, you can get better
> >computational precision (and what's more important, eliminate some "magic
> >constants") by doing:
> >
> >Frequency = 1/( 2 * PI() * sqrt(L * C))
> >
> >
> >
> >
> >
> >
>
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