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Re: Primary Coil Topologies Part 2/2
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To: tesla <tesla-at-grendel.objinc-dot-com>
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Subject: Re: Primary Coil Topologies Part 2/2
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From: Richard Hull <whitlock-dot-com!RICHARDH-at-uucp-1.csn-dot-net>
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Date: Fri, 22 Mar 96 13:23:00 PST
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Encoding: 48 TEXT
Jim,
It is possible to build such a coil. Use an iron core to get the inductance
up quickly. The number of turns would be horrendous. I knew an old radio
amateur who did this a few years back to "listen" to the Shumman resonance
frequencies (with recording pen oscillogrph, of course). I can't remember
the old fellow's name, sorry. I beleive he used about 37,000 turns of #44
wire on a soft iron core of 2 " diameter. This hummer is very directional!!
The final tune would be with rather large swicthed capacitors across the
coil. The Q of the circuit is low, but the received power levels are
usually quite high at this frequency. Dropping a modern
Neodymium-Iron-Boron magnet on the floor at a thousand paces will take out
the front end of a snesitive amp hooked to this thing! This is for
reception only. To make a TC at this frequency..... well, you are on your
own.
Richard Hull, TCBOR
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From: tesla
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yiorgos
Subject: Re: Primary Coil Topologies Part 2/2
Date: Friday, March 22, 1996 8:34AM