if you keep your eyes open you can find 220 duplexers at a good price .. Email Bob Morton and I am sure he can find you one at a good price .. I had 2 from him and love his work
and the shipping cost of a 220 duplexer is not that bad either On Mon, Aug 30, 2010 at 8:44 PM, <cmcclel...@aol.com> wrote: > > > Thank you for your response. > The problem is that the repeater is located on top of a building and the > tower on that building is only about 20 feet tall. We can move the two > antennas apart horizontally, but only 20 feet vertically. Duplexers are way > too expensive and hard to find for the 200 Mhz band. We are running about > 20 watts and the frequency separation is 1.6 mhz. Sometimes a week signal > comes in and sometimes the transceiver is desensitizing the receiver and > covers it up. Any suggestions? > Thanks > Chris > > In a message dated 8/30/2010 8:36:53 P.M. Eastern Daylight Time, > wb6...@verizon.net writes: > > > > Chris, > > You do not have to use a duplexer, but it makes building a repeater SO much > easier! Keep in mind that "antenna separation" usually means vertical > separation, not horizontal separation. Moreover, the same isolation > provided by 1000 feet of horizontal separation might be provided by 10 feet > of vertical separation. The amount of isolation you need is based generally > on the transmit power, frequency separation between TX and RX, and the > sensitivity of the receiver. The receiver bandwidth and antenna types also > play a factor. > > 73, Eric Lemmon WB6FLY > > > -----Original Message----- > From: Repeater-Builder@yahoogroups.com<Repeater-Builder%40yahoogroups.com> > [mailto:Repeater-Builder@yahoogroups.com<Repeater-Builder%40yahoogroups.com>] > On Behalf Of Mackey > Sent: Monday, August 30, 2010 4:44 PM > To: Repeater-Builder@yahoogroups.com <Repeater-Builder%40yahoogroups.com> > Subject: [Repeater-Builder] Duplexers > > Our club was recently given a 220 repeater. We have two seperate antennas. > We do not have a duplexer. My question is do we have to have a duplexer? > How > can we keep the transmitter from desensitizing the receiver? The antennas > are apart but can be moved farther. > Thanks > Chris > Kg4bek > > >
