[TCML] My Hemisphere/Toroid with Unconnected Top Sphere results
ussenterprisencc1701 at rocketmail.com
Fri Sep 11 21:58:44 MDT 2009
Thank you for this in-depth explanation, definitely not info I came across before, and that does make a great deal of sense and does explain why adding the top sphere would not throw off tuning the hemi/toroid.
However, what still remains is with the top sphere directly connected I do not get the same power output (streamer lengths) as with it unconnected/isolated on top, or with one of the wire coil setups I have been testing which get much more power output out of it. It seems to me the coil connecting the top sphere and hemisphere act as a tesla magnifier of sorts, often pumping the hemisphere/toroid output, and sometimes the sphere breaks out. I posted an additional picture of tonight's coil session and result with a double-coil tertiary coil setup.
Website with pics:
Thanks again for that great info and explanation.
I understand what you are saying, but the data is incorrect. The sphere
+ hemisphere/toroid does not add (as though you add the single
capacitance of both). You really need a program that looks at the
effective combined capacitance in situ from ground plane to top load
objects, coil to top load objects, object to object, etc.
For example, a 4" x 20" toroid (by itself) raised 50" above the ground
plane = 22.8pF
Stack a 2nd toroid of the same size resting on top of the first = 26.7pF
If we raise the 2nd toroid up to a 60" height, C increases = 30.8pF
When these top load objects are stacked on top of a coil, the effective
top load capacitance changes again as the secondary coil and primary
coil are then in situ of the objects.
In your case, the sphere will only add about 2pF of C when placed on the
hemisphere/toroid and will only change Fr a few kHz (about 20kHz with
your particular coil). Stacking odd shaped top load objects is something
many of us have done many times over many years and we've made plenty of
measurements to see the effects.
If you have a generator and scope, you should measure the change in Fr.
Playing with top loads is always fun to do, but it sure is nice to take
a measured Fr reading as it tells the tale.
Bart B. Anderson
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