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