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Re: Lprimary tuning calculation

Original poster: "K. C. Herrick" <kchdlh@xxxxxxx>

You're right about that. That's the primary reason, isn't it, for wanting to be able to vary the primary tuning remotely. Use your 4-ft wire scheme, set up for running at reduced power, then sit back 15 ft away and tweak the primary for the best effect. Perhaps even leave off the wire & crank it up to the max.--although I don't know about likely over-stressing of the driving components in that case. Maybe I'll find out...


Tesla list wrote:
Original poster: "S&JY" <mailto:youngsters@xxxxxxxxxxxxxxx><youngsters@xxxxxxxxxxxxxxx>


Yes, you could do that.  However, just being near the secondary will change
its resonant frequency noticibly.  You need to figure out a way to do
measurements or tuning adjustments five or more feet away from your
secondary.  I use a frequency counter & FET dip meter with the sensing coil
at the end of a 10 foot connecting cable, so I can measure the resonant
frequency while being far enough away from the toroid to not affect the
tuning much.

--Steve Y.

----- Original Message -----
From: "Tesla list" <mailto:tesla@xxxxxxxxxx><tesla@xxxxxxxxxx>
To: <mailto:tesla@xxxxxxxxxx><tesla@xxxxxxxxxx>
Sent: Monday, May 29, 2006 12:20 PM
Subject: Re: Lprimary tuning calculation

> Original poster: "K. C. Herrick" <mailto:kchdlh@xxxxxxx><kchdlh@xxxxxxx>
> That sounds like a good idea!  Perhaps one might do that--at least,
> with a s.s.t.c.--while operating the coil at very low power.  Then
> the primary could be optimally tuned while--necessarily--being
> physically close to it, without risking a "zap".
> Tesla list wrote:
> >Original poster: "S&JY"
> ><mailto:youngsters@xxxxxxxxxxxxxxx><youngsters@xxxxxxxxxxxxxxx>
> >
> >The empirical equivalent is to attach a length of wire, e.g. 4 feet long,
> >the secondary toroid, and suspend it outward with a piece of string to
> >as if it was a streamer.  The wire length should be the same length as
> >streamer length you expect.  This adds a few pF of  psuedostreamer
> >capacitance, the same as a real streamer would do.   Then measure the
> >secondary frequency and match the primary to it.  This should result in
> >good tuning, and can be done without the need to power up the coil.
> >
> >--Steve Y.