Re: Magnifiers

• To: tesla-at-pupman-dot-com
• Subject: Re: Magnifiers
• From: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Wed, 21 Jul 1999 11:25:50 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi John, all,
                I'd like to add something to John's note for the 
benefit of those trying to figure out how to tune a mag:

> Original Poster: FutureT-at-aol-dot-com > 
> All,
> 
> Magnifiers work very similar to normal classic TC's.  They
> basically behave as a normal TC with the secondary split into two
> sections.  The primary tunes to the combined secondary and extra
> coil frequencies.  In other words, the primary freq will be lower than
> the extra coil freq, due to the presence of the secondary coil.

Very simply, calculate Cself of the secondary and Cself of the extra 
coil and add them together. That capacitance must also be added to 
effective terminal capacitance to give the total capacitance on the 
secondary side. Sum the two inductances, then use Ctot and the sum of 
the inductances to determine the frequency to tune the primary to.

    You will find that if you take a secondary coil (with, say, an 
aspect ratio of 5:1) and chop it into two coils with h/d=2.5 (for 
example), the sum of the individual Cselfs is higher than the Cself 
of the original coil so a mag made this way will tune to a lower 
frequency than the original resonator.

Malcolm 
<snip>

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