Hi Jeff yes I know -55db is I think around 399 microvolts which will flatten any receiver, he needs to know the actual isolation between the tx and rx ports. I assume that the notch figure Tim mentions is the actual notch of each filter, which is why in my later mail I suggested doing an isolation test with sig gen and analyser
73 Steve ----- Original Message ----- From: "Jeff DePolo" <j...@broadsci.com> To: <Repeater-Builder@yahoogroups.com> Sent: Sunday, July 25, 2010 11:43 PM Subject: RE: [Repeater-Builder] Re: Repeater receiver testing > >> >> Hi >> you beat me to it, I would suggest a duplexer problem as -55dB >> isn't a lot you should have ideally better than 80dB. It also could be >> the fact that you are running too much tx pwr, have you tried dropping >> it down. >> >> 73 >> >> Steve, M1SWB(UK) > > He said he measured the Tx carrier at the Rx port of the duplexer at -55 > dBm; he didn't say he had 55 dB of isolation... > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
