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Something new about antennas??
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To: "'Tesla List'" <tesla@pupman.com>
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Subject: Something new about antennas??
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From: Tesla List <tesla@stic.net>
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Date: Fri, 5 Jun 1998 23:04:35 -0500
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Approved: tesla@stic.net
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From: terryf@verinet.com [SMTP:terryf@verinet.com]
Sent: Friday, June 05, 1998 9:08 PM
To: tesla@pupman.com
Subject: Something new about antennas??
Hi All,
Tonight while making measurements with an antenna I noted an
interesting thing. With a scanner antenna connected to my scope and a
current probe on the second channel I found the following:
With the antenna feed directly to the scope (no 50 ohm termination)
the antenna picked up a signal proportional to the voltage from the coil
(the D or electric flux density field from Maxwell's equations).
With the antenna feed to the scope with a 50 ohm termination inline,
the antenna picked up the current being projected from the coil (the J or
current density field from Maxwell's equations).
These two measurements were 90 degrees out of phase as would be
expected. A small arc from the terminal confirmed the phase.
I should write another paper on this but I am a little "papered out"
at the moment :-) I am now starting to see the big picture of the fields,
currents, and such in Tesla coils. I have been studying field theory's and
they are very key to our work. I never was very good at field theory but I
am sure learning about it now! :-) I'll have more to say later. I have
been up late the last few days and the mind is starting to numb!
Later,
Terry Fritz