Re: [TCML] Using tree as RF ground

["Carl Noggle" <cn@xxxxx>]

Sounds good--360 ohms should be fine with the high impedance of the 
secondary.  Even if you are getting one amp peak currents, that's only 360 
volts peak, and a few volts rms.  You could even use chicken wire and it 
would probably work fine.  In Tucson (dry, alkaline soil), I just have a 3 
foot length of chain buried in a vertical hole (dug with a water jet) and 
that never has any problems with an 1800 watt coil.

---Carl




-----Original Message----- 
From: Jim Lux
Sent: Sunday, October 07, 2012 5:41 AM
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] Using tree as RF ground

On 10/6/12 4:39 PM, Dave Leddon wrote:
> Interesting article.  This could be a boon to Tesla Coilers everywhere
> if we can just figure out how to locate the rebar and connect a wire to 
> it.
> Making the connection shouldn't be difficult once you have a hole
> drilled down to the rebar. You could use a lead concrete anchor and a
> long lag bolt. The problem would be knowing where to drill.
> Dave


Capacitive coupling to the slab is probably just fine at 100kHz.  You're
not trying to conduct fault current from a power line and need a <25 ohm
impedance.

Let's assume you have a square meter of aluminum sheet that sits a
couple mm from the slab..

The capacitance is C = epsilon0 * area/spacing = 8.84E-12 * 1/0.002 =
4.42E-9 Farad.. 4.42nF

Now, what's the impedance at 100 kHz (typical TC frequency)..  about 360
ohms..

Make it 4 square meters and you're down to 90 ohms..

But, even better, that 2x2 meter aluminum sheet provides a very much
lower resistance return for the fields from the top load than the soil
ever will.



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