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Re: And what of the FCC?
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To: tesla@pupman.com
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Subject: Re: And what of the FCC?
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From: Tesla List <mod1@pupman.com>
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Date: Wed, 1 Oct 1997 10:10:48 -0600 (MDT)
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Approved: mod1@poodle.pupman.com
---------- Forwarded message ----------
Date: Wed, 1 Oct 1997 19:35:39 +1200
From: Malcolm Watts <MALCOLM@directorate.wnp.ac.nz>
To: tesla@pupman.com
Subject: Re: And what of the FCC?
Hi Randy,
<snip>
> All of these posts regarding RFI etc have caused me to wonder:
> What is the difference between a rotary gap TC and the prehistoric
> rotary gap CW transmitters? Is it just a matter of tuning a TC to
> deal with an antenna instead of a toroid or sphere as the "load"?
The difference is in the degree of coupling to free space. A TC has a
very high radiation resistance as its 1/4 wavelength is in reality,
*the height of the secondary coil*. If that seems like a strange
notion, think about it. Imagine running a very short antenna whose
length is equal to the height of the secondary coil (tuned by a
loading coil of course ;) at 500kHz. How efficient a radiator at
500kHz will that be?
Malcolm