Re: Extra coil

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

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Robert,

On 9 Feb 2002, at 9:31, Tesla list wrote:

> Original poster: "rheidlebaugh by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>
> 
> NOT correct:  the crystal set used the natural resonant frequency of the
> coil with no capacitor. The tap slide on the coil was the only tuning for
> phase 1 crystal sets. Capacitor tuning came later and was much more
> convinent than the coil tuning. Coil tuning was a trial and error play every
> time you wanted to change and every day you started to recieve.1/2 to 1 hr..
>    Robert  H

It is then difficult to see how tapping could have changed anything 
other than loading and antenna matching to a degree. Tapping the 
aerial at various points would have been a somewhat ineffective way 
of tuning because of coupling between the tapped and untapped 
portions of the coil. I can only attribute the low Q of the circuit 
to the loading that it was subjected to. An extra tuned circuit 
coupled to it would certainly have made a difference. I still can't 
relate this to Tesla's extra coil arrangement.

Regards,
Malcolm
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