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

[Gary Lau <glau1024@xxxxxxxxx>]

Hi Brandon,

A steel table 16" below the primary is probably not a good thing.  SS at
least is better than a copper table (eddy currents and losses won't be as
high), but I'd replace the metal surface with a non-metalic surface.

Regards, Gary Lau
MA, USA

On Mon, Jun 7, 2010 at 3:32 PM, Brandon Garretson
<garretsontech@xxxxxxxxx>wrote:

> Thank you Gary, just what I wanted to hear.
> I will continue to search for an optimal tuning point in the comfort
> of my workshop.
> I just didnt want to spend hours beating a dead horse or risk damage
> to my MMC or NST.
>
> Now, the table I was referring to is about 16" from the bottom of the
> primary. It is all stainless including the legs and adjustable feet.
> My RF grounds are tied into a 6' length of 4awg cable attached to a
> copper-clad rod driven 4' into the ground, 5' outside the door.
> Should I try to connect the table itself to the RF ground?
> I do have mains wires and "run" caps for the phase controller under
> the framework of the coil that would be only a few inches from the
> surface of the table. Does that sound risky?
>
> It is interesting to see that none of the florescent lights, including
> the one I keep by my control panel to gauge my own RF exposure flicker
> in the slightest. When I ran the old configuration outside I could
> light a tube from 15 feet away. The structure must really absorb the
> RF well.
>
>
> On Mon, Jun 7, 2010 at 12:04 PM, Gary Lau <glau1024@xxxxxxxxx> wrote:
> > 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
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