On Mon, 30 Apr 2007 18:30:40 -0500, "amdx" wrote:

Richard, I was starting to lean towards proximity effect possibly causing
all of the affect we have been discussing, so I did some Googling. I kept
find the
same line " increased capacitance lowers Q" But, I think you agree that as
I said
above most efforts to reduce capacitance will also reduce proximity effect.

Hi Mike,

Yup.

I ran across W8JI's page, he's usually pretty exacting in his wording, and
he says,

"Capacitance across any inductor carrying time-varying current increases
circulating
currents in the inductor, increasing loss while simultaneously reducing
system bandwidth."

Tom is also given to non-sequiturs. He polishes his page off with a
list of them such as "Optimum form factor varies with application." As
they used to say, if you want to send a message, call Western Union.

snip "Anything that increases capacitance will reduce component Q"

He never mentions the correlation between interwinding capacitance and
proximity effect

There is not much that can be taken to the bank about what is NOT
said.

The moral of this is standard Engineering practice: start with a goal
and design towards it.

73's
Richard Clark, KB7QHC