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 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of atms169 Sent: Wednesday, May 20, 2009 4:21 PM To: [email protected] Subject: [Repeater-Builder] Desense on High Power Linear Repeater? Hello everyone, I have an issue and I thought I would throw it out there! I have a Dstar VHF repeater system. A 4 Can Telewave Duplexer A Chip Angle Band Pass Filter on receive and a Chip Angle 18 dB pre-amp. Everything works just fine running the repeater barefoot at 20 watts. My problem is when I add the TE Systems amp (Around 100 watts out when hooked up), I lose the sensitivity on the receive. Our portables basically get the bad end of it. How do I go about fixing this issue so I can have the best of both worlds? I good receive and transmit? Aaron KE5KAF
