Re: more on coupled inductors/radiation/etc. (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 11 Jun 2007 10:26:21 -0500
From: Bert Hickman <bert.hickman@xxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: more on coupled inductors/radiation/etc. (fwd)

Tesla list wrote:
> ---------- Forwarded message ----------
> Date: Sun, 10 Jun 2007 17:31:03 -0700
> From: Jim Lux <jimlux@xxxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: more on coupled inductors/radiation/etc.
> 
> Does anyone know how much current there was in the inductor? (I know 
> they've given 400W as the RF power input to the system, and a Q, and 
> the L is calculatable from dimensions, but I wonder if they measured 
> the RF current?)
> 
> Jim
> 
> 

Hi Jim,

The authors indicated that they did measure the currents at the center 
of both the transmitting and receiving coils using "current probes" [RF 
current transformers? Further description not provided], but 
unfortunately they didn't publish the actual numbers. Current 
measurements were made at the center of each coil since that would be 
the maximum current point for their self-resonating helices.

Also, 400 watts was the input (wallplug) power to their Colpitts 
oscillator. The actual RF input power apparently was ~150 watts which is 
how they account for the quoted 40% efficiency (coil to coil RF power 
transfer). Its not clear from their paper whether they measured this or 
back-computed it from the current measurements.

Bert
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