In a catalog from Kathrein antennas products,you expect to have these isolation between 2 dipoles in vertical space and in vertical polarisation : 30 dB with 1 Lambda,42 dB with 1,5 L,52 dB with 2,3 L. It seems that you 'll get more isolation with one antenna in -45� and the other with +45� but with a loss of 3 dB in front of two antennas and worst on the sides.
73 Laurent F1NFY ----- Original Message ----- From: "John Clark" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Sunday, January 04, 2004 2:29 PM Subject: [Repeater-Builder] DB 212 6m repeater antenna null > I have two DB 212 (folded dipole) antennas that I have tuned for a 6m repeater project. I would like to use one for RECEIVE and one for TRANSMIT. > Where does a null occur directly under one of these antennas? I want to place them so that the isolation is best at 51.2 MHz, but as high as possible on a 100' tower. > > John - KI4AWK > > > > > > > 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/ > > 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/
