Pancake Primary (fwd)
From: SBJohnston-at-aol-dot-com [SMTP:SBJohnston-at-aol-dot-com]
Sent: Thursday, February 19, 1998 2:44 PM
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?
>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!