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RE: Interesting Skin Depth Data
Hi Ruud,
I don't have a definitive answer.
But remember that the arc is not isolated in space.
The Primary took a heck of a wallop/belt, i.e. current pulse
a hundred times greater that secondary peak current.
It's pulse nature may induce/activate nearby structures to
re-resonate/radiate at much lower frequencies - like for
example the housewiring ground, a hundred feet or so
until it gets to real earth ! Due to radiative coupling
any metal in your house may be experiencing similar activation.
On a bridge walkway a sign read: break your walk stride frequently
the rationale: don't activate any resonance's that may tear up the bridge !
The stride may be analogous to the TC gap burst rate which may
vary considerably depending upon your gap type,
variac setting, incoming voltage variation, spark loading, etc.
Your LW radio is sensitive to uV's and vulnerable via the AC mains
conduction of TC transients directly to audio circuitry or
intermediate RF amplifiers.
Radio Amateurs frequently find the audio amps in offending radios are
simply rectifying their signal. Especially in close proximity.
Clicks would be a cinch !
Regards, Dale K3MNN
-----Original Message-----
From: Tesla List [mailto:tesla-at-pupman-dot-com]
Sent: Saturday, March 11, 2000 9:53 AM
To: tesla-at-pupman-dot-com
Subject: Re: Interesting Skin Depth Data
Original Poster: "Ruud de Graaf" <rdegraaf-at-daxis.nl>
>Original Poster: "Dale Hall" <Dale.Hall-at-trw-dot-com>
>
>Hi all,
>The theory of using the resonator frequency may be perhaps
>flawed when doing skin affect analysis.
>
>Based upon my oscilloscope observations the
>frequency of an arc event is in the MHz range.
>
>The entire arc event is over in less that a microsecond (1MHz)
>The arc risetimes I've measured are in the order of
>~25nS to ~100nS (~20MHz-5MHz) and some even higher freq.
>
>The resonator serves to provide charge to the Csec.
>
>The discharge of Csec generates the arc freq quite independent
>of the resonator ring up freq, for any one arc event.
>
>At 10-20 MHz arc oscillation, the ~30 MHy of the secondary
>represents good XL isolation from the arc (like a series choke).
>
>At 10-20Mhz the skin affect may well be more of a factor in the human case.
>
>Regards, Dale
>
Hi Dale,
Well, is this good news!!! I hardly can wait to put my coil together and do
some measuring! What I don't understand is, how is it possible to hear
cracking on the radio LW-band when coiling when there is no radiation on
that frequency?
Ruud