This page may help: <http://www.repeater-builder.com/antenna/separation.html>
Mind you, the graphs on that page are from the tube TX days, when transmitters were cleaner. You might need a little more isolation than the graphs show, but they and the text will give you some ideas. Mike WA6ILQ At 09:57 AM 10/2/04, you wrote: >As long as you are using 1 antenna system for TX and another antenna system >for RX then that will work without a duplexer, if you follow a few >guidelines. First, you have to use gain antennas (not 1/4 waves verticals). >Unity gain, omni-directional antennas (like 1/4 wave verticals) radiate in >all directions equally and you cannot effectively isolate one from the >other. Provided you have 2 antennas with some gain, I would recommend at >least 9dBi, you will need enough tower or mast to vertically seperate the >antennas by 10 or 15 feet. If you are using yagi type antennas, the same >rules apply. > >Good luck > >Wade - KR7K > > >----- Original Message ----- >From: "Dakota Summerhawk" <[EMAIL PROTECTED]> >To: <Repeater-Builder@yahoogroups.com> >Sent: Friday, October 01, 2004 5:50 PM >Subject: [Repeater-Builder] Does the R100 need duplexer if using two >anetnnas? > > > > > > > > I have a UHF R100 and need to know if I need a duplexer if I am going to > > be using two antennas. Can someone help? > > Thanks > > Dakota > > > > --- > > Outgoing mail is certified Virus Free. > > Checked by AVG anti-virus system (http://www.grisoft.com). > > Version: 6.0.766 / Virus Database: 513 - Release Date: 9/17/2004 > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > >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/
