Re: [TCML] Effects of surrounding structures on coil performance

[Gary Lau <glau1024@xxxxxxxxx>]

I think that the metal structure might only affect the tuning point,
so that would be easy to compensate for.

If the metal table that the coil is mounted upon is "too" close to the
primary, that can result in losses and may be a concern.

Regards, Gary Lau
MA, USA

On Mon, Jun 7, 2010 at 9:50 AM, Brandon Garretson
<garretsontech@xxxxxxxxx> wrote:
> Greetings all,
> My question today is about the effects of surrounding structures on
> coil performance (especially very large metal ones).
> I finally got my coil all together last night and began tuning procedures.
> The initial tuning point recommended by JavaTC produced only a hint of
> a streamer from a break out point placed on top of the toroid. I moved
> the tap out one turn at a time and got improved streamer length with
> each adjustment but nowhere near the performance one would expect from
> this machine.
> The best streamers were nearing three feet but were very thin and
> purple and yellow in color.
> Before I continue chasing a very elusive tuning point I wanted to know
> if its even worth trying to do so in its current physical location.
> I have it set up in my workshop centered in the opening of the
> overhead door. My shop is a large steel structure (approx. 18’x24’ w/a
> 15’ peak at the ceiling) and there are about 3.5’ of clearance between
> the top and sides of the coil to the frame of the aluminum overhead
> door.
> I also have the coil standing on a 2’x2’x2’ stainless steel table.
> Is this just too much metal to have around the coil to ever get it to
> run properly?
> Should I continue to search for a tuning point or is all the metal
> surrounding the device going to simply suck the life out of it?
> I also thought perhaps the stainless steel table under the coil making
> direct contact with the concrete slab might actually help act as a
> counterpoise, am I wrong about this and it will just detune the coil
> instead?
> If I place it directly on the slab or on a nonconductive table instead
> of the steel one could I then get it to work inside my shop?
> I really like the sterile, well-lit conditions of my shop but if you
> guys think its foolish to even try to tune and operate it inside such
> I structure then I guess I will need to consider moving it outdoors.
>
> Thanks in advance for your brainpower!
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