RE: [] conical secondary (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sun, 17 Jun 2007 07:19:10 -0500
From: David Thomson <dwt@xxxxxxxxxxxx>
To: 'Tesla list' <tesla@xxxxxxxxxx>
Subject: RE: [] conical secondary (fwd)

Hi Bart,

The specs are on the link I gave.  

When I say, "practically no coupling," it should be obvious I'm referring
strictly to inductive coupling.  Of course there is electrical coupling as
electrical current drives the resonator.  Also, there is some degree of
capacitive coupling.

However, if I understand resonance correctly, the center of the flat spiral
coil will be out of phase (inductively) with the solenoid coil, especially
since the two coils are tuned to different (although harmonic) frequencies.
Further, the magnetic field at the center of the coil is 90 degrees tilted
from the magnetic field where the primary and secondary couple.  There is no
way they can be inductively coupled.

These particular coils were built to quarter wavelength specs based upon
wire length.  The solenoid coil had a wire length three times that of the
flat spiral.  The mistaken idea I had at the time was to place the node of
the overall oscillation at the connection point of the two coils.  To begin
with, the node would have been at 22.5% of the total wire length, not 25%.
Also, it appeared the solenoid resonated independently of the flat spiral
secondary, as evidenced by the topload standing wave and misplaced node.

Dave

David W. Thomson  

> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx] 
> Sent: Saturday, June 16, 2007 9:51 PM
> To: tesla@xxxxxxxxxx
> Subject: Re: [] conical secondary (fwd)
> 
> 
> ---------- Forwarded message ----------
> Date: Sat, 16 Jun 2007 20:26:45 -0700
> From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: [] conical secondary (fwd)
> 
> Hi Dave,
> 
> What do you mean that the solenoid has practically no coupling? 
> Certainly it does. There is both electrical connectivity and 
> mutual inductance between those two coils. They definitely 
> couple to each other and probably a good value considering 
> their proximity. Give me specs on the two coils and I'll tell 
> you how much.
> 
> How did you measure coupling between the two?
> 
> Take care,
> Bart
> 
> Tesla list wrote:
> 
> >---------- Forwarded message ----------
> >Date: Sat, 16 Jun 2007 21:17:12 -0500
> >From: David Thomson <dwt@xxxxxxxxxxxx>
> >To: 'Tesla list' <tesla@xxxxxxxxxx>
> >Subject: RE: [] conical secondary (fwd)
> >
> >Hi Scott,
> >
> >  
> >
> >>     Did anybody consider a flat secondary with a helical 
> resonator in 
> >>a magnifier setup?  My thinking is that would give the absolute 
> >>maximum current (from the flat secondary) and potential (from the 
> >>helical resonator).
> >>    
> >>
> >
> >This is essentially my setup:
> >http://www.tesla-coil-builder.com/FlatSpiralSolenoidCombo.htm
> >
> >A tall solenoid coil has practically no coupling when 
> connected to the 
> >center tap of a flat spiral coil.  The solenoid is operating 
> as a resonator.
> >That is how I generated the coronal standing waves (longitudinal, 
> >scalar, whatever you want to call them) on the topload.
> >
> >Dave
> >
> >
> >
> >
> >
> >
> >  
> >
> 
>