Hi Kris at those prices yes $1000 for a 6mtr is fair, in UK money that is about £650... I know a chap in the UK who origionaly used heliax for a 6mtr duplexer, and due various things happening it was forever going off tune. In the end the repeater group saved up and bought a commercial Procom duplexer, and problems solved, no more rx desense
73 Steve ----- Original Message ----- From: "Kris Kirby" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Friday, July 22, 2005 8:20 PM Subject: Re: [Repeater-Builder] Still after > 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 > > > > > > Yahoo! Groups Links > > > > > > > > > > -- > No virus found in this incoming message. > Checked by AVG Anti-Virus. > Version: 7.0.323 / Virus Database: 267.9.3/56 - Release Date: 22/07/05 > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
