RE: twin coil system

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

Original poster: "Basura, Brian by way of Terry Fritz <twftesla-at-uswest-dot-net>" <brian.basura-at-unistudios-dot-com>

Terry/all,

I've experienced the same tuning issues on the Mini-Twin as Bill did on his
Model 12 (needed to tap one of the primaries different than the other one).
My gut tells me it has to do with the amount of primary coupling with each
secondary (i.e. Tapping more primary turns on one side and removing turns
from the other will keep the same total inductance BUT each secondary will
have a different amount of coupling).

Looking further into twin coil coupling interactions is one of the may
projects on my to do list :)

Regards,
Brian B.  

 -----Original Message-----
From: 	Tesla list [mailto:tesla-at-pupman-dot-com] 
Sent:	Sunday, January 07, 2001 2:22 PM
To:	tesla-at-pupman-dot-com
Subject:	RE: twin coil system

Original poster: "Oxandale, Terry by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <Toxandale-at-SPP-dot-org>

To Bill and all,

In regards to the wonderful text about your twin model 12, I am puzzled
about why one coil performed so differently than the other half with a
given primary frequency. I read where the immediate surrounding of one
of the the coils (switchgear, conduit, etc) made a difference, but I
guess I am wondering how this required primary tap changes even though
the secondary resonant frequency is fixed. I was under the impression
that the tap points on the two individual coils was not too important as
long as the sum of the two primary inductances was set to the correctly
tuned inductance (i.e the off axis inductance issue). Could you please
expand on this.

Terry