Aaron, You left out the crucial information: What model Telewave duplexer?
73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of atms169 Sent: Wednesday, May 20, 2009 5:29 PM To: [email protected] Subject: [Repeater-Builder] Re: Desense on High Power Linear Repeater? Yes, 80 dB on the duplexers, 100 watts in, that's 10 dB and the preamp 18 dB, so I'm losing 8 dB ?? The sensitivity I believe is 0.4 uV Dstar system. I live in Texas where it's flat. I'm adjusting my station to compensate for the height value. More power good receive. There is a 1000 foot commercial tower here which would have been perfect, but they want too much to let me use it. Model Numbers: Angel Linear PreAmp 147GNT Angel Linear Filters 2BP147N TE Systems 1412RAN Linear Amp Superflex Cables 4 Can Telewave Duplxers 600 KHz split (Yes it does 600) I had thought of adding two more cans and purchasing a new phasing harness but, someone told me to stop and just add more filters. So I'm not sure which direction to go. I would like to push more power if possible. Thanks Aaron --- In [email protected] <mailto:Repeater-Builder%40yahoogroups.com> , "Eric Lemmon" <wb6...@...> wrote: > > Aaron, > > My CommShop for Windows program suggests that about 88 dB of isolation is > needed for a 20 watt repeater, assuming 0.2 uV sensitivity on the receiver- > which you didn't specify. Bumping the power to 100 watts will increase that > figure to about 95 dB. My gut feeling is that your duplexer is not up to > the task. > > What is the model number of your Telewave duplexer, and of your Angle Linear > bandpass filter? Are all of your jumpers double-shielded, with no adapters? > Do you have an isolator on the output jack of your TE amplifier? Have you > verified with a spectrum analyzer that your PA output is free of spurs? > > Since increasing the power output of a repeater seldom increases its > coverage area, is it really necessary that you run 100 watts? > > 73, Eric Lemmon WB6FLY >
