Re: Propagation velocity in long helical coils.

• To: tesla-at-pupman-dot-com
• Subject: Re: Propagation velocity in long helical coils.
• From: "Gavin Dingley" <gavin.dingley-at-astra.ukf-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Mon, 29 May 2000 12:27:25 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi all,
I wrote another little program to check the true self C, or Ccox formula,
and so
tested it against the info given in this post from Terry. My values are in
brackets
next to the originals given.

Regards,

Gavin, U.K.

Tesla List wrote:

> Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
>
> Hi Bob,
>
>         I suspended my two coils from the ceiling with heavy nylon cord
and strung
> a wire down to the LCR meter with the other lead of the meter grounded.  As
> I approached the coils, they seemed very stable and they were not
> excessively affected by surrounding objects in my case.  The distances from
> other things was about 3 feet minimum.
>
> For the small coil:
> L=22.1mH (measured)
> D= 4.26 inches
> L= 26.125 inches
> Fo measured= 351.5 kHz
> Fo Medhurst= 337.1 kHz    (341.19kHz)
> Fo Jones= 356.1 kHz    (362.63kHz)
>
> For the large coil:
> L=75.4mH (measured)
> D= 10.26 inches
> L= 30.0 inches
> Fo measured= 146.5 kHz
> Fo Medhurst= 146.3 kHz    (148.77kHz)
> Fo Jones= 151.11 kHz    (161.58kHz)
>
> So it looks like your formula works extremely well!!
>
> Cheers,
>
>         Terry
>
>
>

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