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Pancake Primary (fwd)




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From:  Jim Buck [SMTP:jimbuck1-at-bellsouth-dot-net]
Sent:  Friday, February 20, 1998 7:32 AM
To:  Tesla List
Subject:  Re: Pancake Primary (fwd)

Tesla List wrote:
> 
> ----------
> From:  SBJohnston-at-aol-dot-com [SMTP:SBJohnston-at-aol-dot-com]
> Sent:  Thursday, February 19, 1998 2:44 PM
> To:  tesla-at-pupman-dot-com
> Subject:  Re:  Pancake Primary (fwd)
> 
> Jim Buck wrote:
> 
> >I then ran the coil at low power and unwound the helix turn
> >by turn until the corona stopped.
> 
> Do you mean you "loosened" the upper/outer turns, increasing their diameter
> and thus reduced the number of turns?

Yes, I just increased the diameter until the corona stopped starting at
the top turn of the primary & working down turn by turn.
> 
> >When I found the shape I
> >built my forms 1" larger diameter at the same angle.  I'm
> >not sure how well the corona compares to the magnetic
> >coupling but the coils seem to be coupled efficiently
> >(raising the secondaries doesn't increase the output much).
> 
> I haven't seen corona on the primary, but so far I haven't excited the coil
> with that much energy, I guess.  Or maybe flat spiral primaries are more
> prone to corona?
> 
> Thanks for the tips!
> 
> Steve Johnston
> 
> sbjohnston-at-aol-dot-com