Yeah, we made a 6 meter cavity out of some dryer ventalation hose. It
had a beautiful notch right where it should be, until you walked
around the room.
On 7/22/05, Kris Kirby <[EMAIL PROTECTED]> wrote:
> 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]>
> "BIG BROTHER IS WATCHING YOU!"
> This message brought to you by the US Department of Homeland Security
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