# Re: tuned coils

```Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net>

One could calculate the amount of energy intercepted by the "receiver" using
standard electromagnetics equations.  However, to get a good answer, you'd
need a fairly accurate description of all sorts of things like the precise
shape of the various components, the ground resistance (on a point by point
basis).  You'd also need to factor in the losses of the various components
(including such things as corona).  Suitable for a doctoral thesis (and then
some)...

The short of it is, you've already figured out the best way: empiricism....
walk away and measure the power at various distances.  By the way, this
would be a fascinating experiment, and I hope you report back on the
results.  Ideally, you could hook up a variable resistor on the "receiving"
coil, and measure the voltage at various resistances as you change the
tapping point on the primary.  From this you could measure the effective
source impedance of the receiver, as well as measuring the received power.

You can also vary the height of the transmitter and receiver above ground,
change the size of the toroids and change the ground resistance (i.e. do it
with the soil dry (or frozen) or wet)

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, February 16, 2001 7:06 PM
Subject: tuned coils

> Original poster: "R Lunsford by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<Millipede-at-carolina.rr-dot-com>
>
>  Hello,
>  Once again, I am entering a realm beyond my training. I have been doing
> some research in the use of Tesla coils to wirelessly transmit
electricity.
> So, what I am planning on doing is creating a series of tuned coils about
> the property here and using them as ,well, really fancy extension cords.
>  Have any of you tried this? And besides just walking away till it no
longer
> works, is there a good formula to find the outside usable distance from
the
> transmitter?
>  Well, wish me luck. I am working on a web site to add to the tesla ring
so
> hopefully I will have something up to see soon.
>  Robert Lunsford
>
>
>
>

```