Re: [TCML] Re: Stacked Toroids

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

What worked well for me is a 5 gallon bucket. I simply
cut the bottom off and placed it between my 6x24 and
my 8x34. I'd like to experiment with raising it more,
but am limited by garage door height. I plan on
covering the bucket with aluminum tape, but currently
have the two toroids connected with copper strap.

To secure my toploads, I have a six foot long, 3/4" or
7/8" (I forget) nylon threaded rod, which enters the
top of my coil and goes down towards the bottom. I
have a heavy 1" thick PVC disc which is attached to
the bottom. The wieght of the disk holds my two
toploads very securely, yet allows me to easily raise
or lower them.

Adam

--- bartb <bartb@xxxxxxxxxxxxxxxx> wrote:

> Hi Phillip,
> 
> As the top toroid is raised above the first, the
> total top load C will 
> increase with distance (both indoors or outdoors).
> As the two toroids 
> are separated, Ctop increases and frequency will
> lower. Normally in a 
> toroid stack (with no separation between the two),
> the total capacitance 
> will be an average of the stacked toroids individual
> capacitances in 
> situ. So, if your looking for "max capacitance", you
> would have to 
> separate the two beyond practical limits. Maximum
> stack height is based 
> on what is practical to operate both mechanically
> and for breakout 
> (preference is usually the top toroid, but doesn't
> have to be).
> 
> You'll never reach the capacitance of the individual
> sum of both, but 
> you can come to about 85% of the combined individual
> capacitances with 
> ridiculous heights. The two toroids directly on top
> of one another above 
> the coil is about 34pF. With the top toroid 85"
> above the bottom toroid, 
> about 52pF. Practically, you'll likely not go beyond
> 40pF (20" above).
> 
> I'm not sure how you plan to connect the two, but Ed
> Sonderman used a 
> cylinder of sheet metal between the two.
> http://members.aol.com/esondrmn/index.html
> 
> Take care,
> Bart
> 



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