Eric is correct, I always use a window filter in front of our preamps on UHF. Usually used with a receive multicoupler to over come losses in the spliters. Most modern repeaters don't need a lot of help in the sensivity dept. My first experiences with preamps just added noise and desense problems by me being greedy on the amplification. I now usually run the RX multicouplers on our repeater systems a little hot 3-5 dB just because I can't help myself :>) and it does help if you are careful.
Frank KO5S --- In Repeater-Builder@yahoogroups.com, Eric Lemmon <[EMAIL PROTECTED]> wrote: > Adding a preamp to some repeater systems does not always make it "hear" > better; sometimes the receiver becomes more sensitive to overload, > intermod, desense, and has a higher noise level. You can mitigate some > of these problems by placing a bandpass cavity immediately in front of > the preamp. > > Most bandpass/bandreject duplexers have surprisingly little bandpass > effect, and will pass an awful lot of signal on either side of the > receive frequency. A dedicated bandpass cavity will act as a > preselector to greatly limit the signal seen by the preamp, and that > will significantly reduce the noise floor. > > 73, Eric Lemmon WB6FLY > > uplink28 wrote: > > > > I'm thinking about putting a receiver preamp in our system. Any words > > of advice from anyone would be greatly appreciated. Brand, model, etc. > > If you ahve one for sale let me know too. Thanks. > > > > > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
