Hey---
We built a double-ended coil in high school, from an old book which has
now been lost. It was a most excellent book, not too big, tan colored
hardcover. It had much useful information, and one of these pieces of
wisdom was that you should make your secondaries fat, like Mark says.
Our secondary ws 4 ft long x 11" dia. It worked quite well, especially
for having no end loads. My current coil (pun not intended, but not
removed either) is single ended, 30" high x 12" dia. It works fine.
Does anybody know the book of which I speak, maybe even knows where a
copy may be obtained?
I presume that the fat secondaries work better because of the better
coupling. Does this sound right?