a TEE ??? ok when you want both antennas to XMIT & Recieve at the same time a Tee is designed for that purpose, but for repeater that will not fly !
My sugguestion the ARRL Handbook and some primer on repeaters, this stuff is on the Extra Exam BTW Mark Holman [EMAIL PROTECTED] http://www.ab8ru.org Life Member A.R.R.L. ----- Original Message ----- From: "Q" <[EMAIL PROTECTED]> To: <Repeater-Builder@yahoogroups.com> Sent: Sunday, May 01, 2005 10:53 PM Subject: Re: [Repeater-Builder] Converting Use of Duplexer from SingleAntenna to Split Antenna? > You would gain much more isolation by separating them vertically. Side > by side would also mess up the pattern. Not familiar with that > duplexer,but if it has a Tee at the antenna port,simply remove it and > connect the two antennas where the Tee was. This >may< throw the tuning > off some but is worth a try. Why do you feel the need to split the > antennas? Having desense problems? 73,Lee,N3APP > > k3phl wrote: > >>Hello all, >> >> I am considering running split antennas at my 220 MHz site in >>Philadelphia as a test to increase sensitivity and troubleshoot a >>duplex noise issue. The machine is currently a modifed Motorola >>Micor using a TX/RX 4 can duplexer, DCI bandpass filter in the RX >>leg, and a Comet Super 22 (220) base antenna. >> >> I am considering running separate Super 22 antennas 12 feet apart >>horizontally. One feedline run will go from the transmitter direct >>to the TX antenna. The other feedline run will run from the receiver >>to RX port of duplexer, common port of duplexer to 220 bandpass >>filter and then to the RX antenna. The TX port of the duplexer will >>remain unconnected. >> >> I expect the duplexer to act as a 2 can deep notch, eliminating the >>transmitter from the receiver with the TX port open. I assume the TX >>rejection in the receiver line should improve and the resulting RX >>sensitivity should improve since the transmitter has been reduced to >>a strong near field instead of RF on the same line. Is this the >>correct theory of using a duplexer in a split antenna site and if so, >>should the TX port be left unconnected or capped with a 50 ohm load? >> >>Thanks in advance, >> >>Steve >>K3PHL >> >> >> >> >> >> >> >> >> >> >> > > > > > > > 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/
