This site explains some of the basics: http://www.xs4all.nl/~pa0nhc/repeater/duplexfilter/English/duplexfilter.htm
Here are some plans: http://www.vacsew.com/435/dup.htm http://www.dalek.org/srg/cavity.html http://www.repeater-builder.com/rbtip/2mduplexer.html http://www.btinternet.com/~g4kqu/gb3dx_photos.htm ----- Original Message ----- From: "David Schornak" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, March 15, 2004 4:25 PM Subject: [Repeater-Builder] duplexers has anyone or does anyone know where tofind the math formulas to help you design a set of cavities for a duplexer? I have been looking on the web and in the arrl handbook and the big book of antennas, and todate I have found plans for 2 meter duplexers. I have yet to find any place where they show or have written out the formulas for designing your own cavities. I was thinking that there should be something out that that that for this frequency range your cavity hieght is this and the diameter is this..... so is there a site or a book that gives you the theory and or the math so that you could design your own set of duplexers/ cavities? Yahoo! Groups Links 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/
