Re: slow-wave helical resonator

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

Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

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

> For maximum spark length this may be true.  However, for a magnifying
> transmitter the tuning is different.  Here are Tesla's instructions from the
> July 24, 1899 C/S diary entry:
>...

> That is to say, first increase your power supply voltage by transformer
> action with a 'master oscillator,' then use it to drive a 1/4-wave helical
> resonator.

Actually, an exact analysis of the lumped model reveals that nothing of
this is true. The correct relations can be found at:
http://www.coe.ufrj.br/~acmq/tesla/magnifier.html

Note that the mathematical analysis of the two-coil system was only done
by 1904, and the analysis of the three-coil system much later. Tesla
didn't have even good instruments to see what was happening. He was
just guessing.

Antonio Carlos M. de Queiroz