RE: Toroid Construction - Need something good . . .

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Gary.Lau-at-hp-dot-com>

There is no need to avoid the use of metals in and around one's coil.  As
long as LARGE portions (like NST cases) are at least 12"-18" away from the
primary, there will be no significant losses.  Little bits like small
screws don't matter, no matter where they are used, even right in the
center of the primary.  For large objects, it doesn't matter that such
metals are ferrous or not.  Eddy currents (the cause of losses) are
produced in any kind of conductor, ferrous or otherwise.  

For top loads, again, it makes no difference what material is used, as long
as it is a conductor.  A top load is sufficiently distant from the primary
that eddy currents are not significant.

Gary Lau
MA, USA


Original poster: "cd by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<vbprg1-at-hotmail-dot-com>

I went to great pains to eliminate all ferite type metals from my coil
construction.
the nearest piece of iron based metal may or may not be in the vacum motor I
used for suction on the single gap spark gap. If there is no ferite in this
component located 2-3 feet below the primary decking then
the next iron based piece of  metal
would be the NST cases about 4-6 feet from the primary decking.

Is it possible to use a Stainless steel topload
without producing a hazardous EM field on top of your coil?
hazardous to the EM field your intentionaly creating with the primary
secondary

Chris

<major snippage...>