[TCML] 4" coil resonant freqencies, three top loads

[bartb]

Hi Jim,

Yes, the toroid had the highest Q. Of course, this toroid is more like a 
corona ring due to it's extremely small size in comparison to the coil, 
but in this case, it does produce the highest Q. There is almost no C 
loading which is why. Now if the toroid were normally sized (say 4" x 
20"), Q would drop. As you go larger and larger Q will continue to drop. 
But there is that point with a really small top load where it does 
actually increase from the aspect of no top load at all.

Take care,
Bart


Jim Mora wrote:
> Hello,
>
> I thought it may be of some interest of the measurements of my 4" coil
> resonance frequencies. It is wound 23.25" with # 25 Awg (it measures
> slightly less than that, closer to 26 (winding stretch perhaps). It is close
> wound on a 1/8 acrylic form and coated with poly.
>
> The measurements were the closest I could read with my analog oscope.
> Amazingly, the WWII vintage tube "Precision" RF generator I was using was
> very closely calibrated after letting it heat up all night. 
>
> Unloaded spot on		400KHZ
> 6"x1.75" John toroid	378Khz
> Sphere stacked toroid	303Khz
> 8" stainless sphere	278Khz
>
> What was interesting was I assume the greatest Q was when the toroid only
> was present as evidenced by a very sharp tuning point( very steep potential
> rise and fall on either side of resonance). Would you agree with that? How
> do these numbers compare to what is expected? The coil was raised above a
> tin foil counterpoise plane by 12". Now to get a starting tune point on the
> Solenoid primary...:-)
>
> Sparks,
> Jim Mora
> Ojai, Ca.
>
> Say, this is supposed to be winter activities in this hemisphere, its 80F
> outside. I wish my x-ray cables I ordered were here from Canada. I recently
> bought one of Jack's BIG x-ray transformers and converted it(150KV .6 amps
> AC) for a Jacob's ladder. Pics on that latter! Someone was referring to
> ramps and such for big iron. Buy an engine cherry picker. I couldn't survive
> without it!!
>
>
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