[Lowfer] loop Rr (2-turn loop)

[Bill Ashlock]

Lyle,

>It is easy to show that at DC, an electromagnet made from 20 turns of a
>given wire size in series has exactly the same efficiency as one made >from 
>the same 20 turns connected in parallel. The only thing that >matters is 
>the total cross section of copper.

Excellent point. I just reviewed the notebook entries I made during my 
multiturn experiments and find the data reflects exactly this relationship. 
At the time, however, I expected more improvement in the efficiency with the 
series connection. For every doubling of the number of turns there was 
approx 1.4X increase in signal (assuming constant power in). It took 4 turns 
to see a doubling in the signal measured with one turn. At the time I think 
I expected a doubling of the signal with a doubling of number of series 
turns. Likewise, for the parallel connection, it took 4 turns to double the 
signal strength measured with one turn.

My measurements of Rac indicated a doubling with each doubling of the number 
of turns for the series connection and a halving for each doubling of the 
number of turns with the parallel connection. These values are consistent 
with the above signal values measurements when the input power was adjusted 
to 1W by changing the turns ratio of the matching transformer.

>I don't know just when that would happen, but tree losses may have 
> >contributed to the higher than expected resistance of Bill's 
> >experimental two-turn loop.

The experiment was with a reduced-size 40' by 40' loop. This allowed 
suspension from a couple of ropes placed over the highest trees and I had a 
~15 ft spacing between the loop and the closest tree.

Bill A




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