Re: MHz - VTTC

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

Original poster: herwig.roscher-at-gmx.de 


Robert Heidlebaugh wrote:

 >  I dont understand your coil form problem. PVC pipe comes in
 > 1/2 inch to over 4 ft diameter and you can make a fiberglass or
 > polyester/paper coil form any size and shape you want.

Robert,

The smallest polypropylene (preferred because of smaller RF losses
and higher temperature stability) pipe, I can get, has 1.6" diameter.
PVC pipes with smaller diameters (for electric household
installation) are very thin-walled and unstable.

For the tank coil of my new VTTC I have tested AWG 9 and it got warm
rather quickly. The secondary coil form consists of a lower
fiberglass pipe and an upper ceramic form, which is glued into the
lower pipe. Both parts - and the winding of course - become warm
quickly as well. Therefore I am looking for suitable new forms.
However, I dislike messing with fiberglass and polyester  ;-)

BTW: What are the advantages and disadvantages of split stator - in
comparison to butterfly- variable air capacitors?

Cheers,

Herwig


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Greed is the root of all evil!
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