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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