Re: slow-wave helical resonator

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gary Peterson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <glpeterson-at-tfcbooks-dot-com>

> It took about five minutes with an oscilloscope to find out that this
> recipe doesn't work for anything. In treating the pri-sec system as a
> master oscillator, the assumption is made that the primary is driven
> by a voltage source and that the pri-sec behaves like a voltage
> source. Unfortunately, neither is true. The primary is driven by a
> charged capacitor which runs down as energy is transferred, and
> coupling constant between primary and secondary of less than 1 or
> close to it also causes the system to deviate from the properties of
> a voltage source.

When following the recipe did you look at the RF energy distribution with
your spectrum analyzer?  Tesla described a modification of the basic
magnifying transmitter circuit that would also be interesting to look at.
In each case the object appears to be getting a narrow signal at the
resonant freq. of the e-coil.

Colorado Springs
Sept. 18, 1899
Experiments were resumed with all transformers in place, HIGH SPEED BREAK
and connection in multiple arc of West. Transformer. The object was to
further test the intensity of the vibrations produced particularly WITHOUT
SPARK. The connection was as in diagram.

www.tfcbooks-dot-com/mall/more/images/csn_p189.jpg

It was though that in this arrangement, which was dwelt upon before, the
DISTURBANCES were produced more economically than when using a spark
discharge. The experiments fully confirm this.  In the tests the capacity of
the two balls of 18" diam. did not very materially derange the adjustment
and period of the circuit.  This is to be expected; as for the secondary the
capacity was far too small and on the other hand the INDEPENDENT VIBRATION
OF THE EXTRA COIL could not be materially interfered with since the
condenser formed by the two balls and zinc plate allowed free passage of
currents to earth.  Now the important thing was to decide whether it is
better to make length of extra coil one half or one quarter of wave as
before. This to be thoroughly investigated.  THE WORKING WAS EXCELLENT WITH
1/4 WAVE LENGTH.

Regards,
Gary