IF you plan to make a duplexer for two meters using 1/4 wave stubs with standard 600Kc split forget it ! Stubs are Great for out of band filtering but are too broad for use at 600 KC splits. I used a 1/4 wave stub to notch out a 929 MHz paging transmitter located on the same building with my 2 meter repeater. I was able to get about 42Db of notch with a single stub.
73 AC0Y --- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: > Ok, So you can make some kind of filters by placing a "T" in line with a piece of equipment and cut the Coax for 1/4 wavelength at the desired frequency. > > But What is the difference between a shorted stub and an open stub? > > Also does coaxial size determine bandwidth, and if so does anyone have a chart of what cable does what? > > I am intrested in making a coaxial stub duplexer for 2 meters and 6. My original concept is for 1 1/4" copper tubing for the outter conductor and 1/2" copper rod for the center. > > __________________________________________________________________ > Switch to Netscape Internet Service. > As low as $9.95 a month -- Sign up today at http://isp.netscape.com/register > > Netscape. Just the Net You Need. > > New! Netscape Toolbar for Internet Explorer > Search from anywhere on the Web and block those annoying pop-ups. > Download now at http://channels.netscape.com/ns/search/install.jsp 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/
