On Fri, 22 Jul 2005, Dave VanHorn wrote:
> Copper pipe is probably workable, though expensive.
onlinemetals.com -- 1' brass pipe, 6" diameter... $303! I'm starting to
think that copper sheet rolled into a cylinder would be a better idea.
a 7" diameter duplexer is 22" in circumference. a 24" x 48" piece of
copper sheet would yield 7 duplexers at 440 MHz. At 18 GA, the width of
the material is 0.048". At 1MHz, the skin depth is 0.0026 in, and
decreases with frequency. 0.0135" is the smallest size that
onlinemetals.com stocks (which is 28 GA) and costs $71.15 in a 36" x 48"
sheet.
Suddenly that $1K price tag on the used 6m duplexer doesn't look so bad.
--
Kris Kirby <[EMAIL PROTECTED]>
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