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# Re: Lprimary tuning calculation

```Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>

KCH,

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" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, May 29, 2006 12:20 PM
Subject: Re: Lprimary tuning calculation

> Original poster: "K. C. Herrick" <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".
>
> KCH
>
> 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,
to
> >the secondary toroid, and suspend it outward with a piece of string to
act
> >as if it was a streamer.  The wire length should be the same length as
the
> >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
very
> >good tuning, and can be done without the need to power up the coil.
> >
> >--Steve Y.
>

```