Re: Radial Horizontal Ground Rods (RHGRs :-)

From: 	ghunter-at-mail.enterprise-dot-net[SMTP:ghunter-at-mail.enterprise-dot-net]
Sent: 	Friday, December 12, 1997 11:27 AM
To: 	Tesla List
Subject: 	Re: Radial Horizontal Ground Rods (RHGRs :-)

Quarter-wavelength ground radials at Tesla coil frequencies are
impractical unless your house lot covers a few hundred acres.  Even
at HF amateur frequencies, where a quarter-wavelength is reasonably
short, "tuned" ground radials are a virtual impossibility because
the earth detunes them.  Ground radial systems are effective because
they behave like one plate of a huge capacitor tightly coupled to the
earth, presenting a very low resistance at RF.  For this reason, a
large number of physically short radials actually sink RF better than
a small number lengthy "quarter-wave" radials.  



Frozen in East Anglia

To:            "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
Subject:       Re: Radial Horizontal Ground Rods (RHGRs :-)
Date:          Fri, 12 Dec 1997 09:21:00 -0600
From:          Tesla List <tesla-at-pupman-dot-com>

From: 	Sulaiman Abdullah[SMTP:sulabd-at-hotmail-dot-com]
Sent: 	Friday, December 12, 1997 6:00 AM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: Radial Horizontal Ground Rods (RHGRs :-)

Greetings, I suspect the "best" horizontal grounding would be as if
you were building an r.f. transmitter, i.e. the horizontal elements
should be 1/4 wavelength long, the same as the length of wire used to
wind your secondary coil. (or as long as possible if not achievable)

>To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
>Subject: Radial Horizontal Ground Rods (RHGRs :-)
>Date: Thu, 11 Dec 1997 08:48:59 -0600
>From: Tesla List <tesla-at-pupman-dot-com>
>From: 	Adam[SMTP:absmith-at-tiac-dot-net]
>Sent: 	Wednesday, December 10, 1997 8:16 PM
>To: 	tesla list
>Subject: 	Radial Horizontal Ground Rods (RHGRs :-)
>OK, I have probed all over my yard, and it is so seriously 
>that driving a ground rod deeper than 16" is impossible.  My home is 
>surrounded by stone walls, since everytime the house is added onto, the 
>builders unearth hundreds of rocks in the 20-500lb range.  
>So, I have decided to try using three 8' 1/2" ground rods radiating out 
>from my coil location, buried horizontally about 6" below the ground 
>surface along with a decent amount of rock salt (NaCl, not the CaCl2 
>kind) to help out.  All connections are now 2" wide copper flashing 
>strips (previously #4 DC cable).   As soon as the weather is nice 
>for me to move my coil outside, I will let you all know how this works.
>I am still open to suggestions on what other shallow-ground techniques 
>might be worth while- maybe burying long and wide copper flashing 
>Adam Smith
>Epoch, Inc. Digital Music Project
>www.tiac-dot-net/users/absmith/                 MP3 Demo Tracks Now 

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