Re: Coupling variance method

To: tesla-at-pupman-dot-com
Subject: Re: Coupling variance method
From: "Dr. Resonance" <Dr.Resonance-at-next-wave-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Wed, 08 Dec 1999 18:43:20 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Yes, this technique was used in the heyday of wireless.  It was used for
matching loads to antenna and between pri = sec of HV air core coils.   It
is technically called a variometer.   With good design (large dia) it is
very low inductance & high Q factor and a series variometer can be used to
adjust the inductance while the oscillator is operating (very carefully of
course).  N. Tesla used a variometer in several of his designs especially
Col. Springs.

Dr. Resonance


-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Wednesday, December 08, 1999 12:10 PM
Subject: Coupling variance method


>Original Poster: Grayson B Dietrich <electrofire-at-juno-dot-com>
>
>Hello, All
>
>Can the coupling between two cylindrical coils be adjusted by rotating
>one or both on thier minor axes?
>
>This question ocurred to me when pondering a "magnifier" type VTTC, with
>separate grid, plate, output and "free resonator" coils. The output and
>grid coils would be placed within a large diameter plate coil, and each
>one would be rotated so as to change the angle between thier magnetic
>fields.
>
>Would this be a viable means of adjusting coupling?
>
>thanks,
>
>
>Grayson Dietrich
>http://www.electrophile.8m-dot-com
>
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