Re: Resonance equations (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 09 Aug 2007 20:12:41 -0500
From: Shaun Epp <scepp@xxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Resonance equations (fwd)


----- Original Message ----- 
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, August 08, 2007 12:55 PM
Subject: RE: Resonance equations (fwd)


> ---------- Forwarded message ----------
> Date: Wed, 8 Aug 2007 12:47:45 -0500
> From: David Thomson <dwt@xxxxxxxxxxxx>
> To: 'Tesla list' <tesla@xxxxxxxxxx>
> Subject: RE: Resonance equations (fwd)
>
> Hi Shaun,
>
>> I think what your measuring is a result of mutual impeadance
>> (Xm).
>
> I'm familiar with the impedance equation.  And it is a fun exercise,
> although unrelated (as far as I can tell) to the other two equations I
> have presented.
>
> How can you derive the other two resonance equations I provided from
> the impedance equation?  Have you tried tuning coupled coils to these
> other frequencies and testing them with your signal generator and
> oscilloscope?
>
> Dave
>

I don't know where you got those other equations from???

 I have done signal generator sweeps of both my secondary coil and found one 
resonance.  I used a signal generator, a resistor and made direct connection 
to my secondary and scoped the voltage at the coil.  Then I did a primary 
tank sweep test with the spark gap jumpered and adjusted the tap to match 
the resonant frequency of the secondary.  I also only found only one 
resonant dip, my coupling was set low at that time.I used a  resistor and 
scoped the dip.  The frequecies matched what Wintesla program determined and 
after running the coil, I only had to make small adjustments to the tap.

If there were other resonances, this would cause problems with the secondary 
and you'd get voltage maximums at other places along the coil that could 
cause insulation break down.

I just checked a book I recently bought, "Electronics: Circuits, amplifiers 
and gates".  It's a college and university level book and It has no mention 
of these other resonant frequency equations.  The equations you have look 
like someone goofed with there math.

Shaun Epp