Tim, I use CommShop for Windows, a handy package that does much more than duplexer isolation calculations. Go here for more info: <www.dcico.com/dcilmr.htm>
It calculates that you'll need about 93 dB of isolation, which requires more than 19 miles of horizontal separation. This can be reduced by using lower power output, a better receiver and PA, and perhaps directional antennas. Bear in mind that CommShop and similar programs make many assumptions to come up with these estimates, and some or all of those assumption might be invalid. YMMV... 73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Tim Ahrens Sent: Thursday, January 21, 2010 7:21 PM To: [email protected] Subject: RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers) Hi Eric/all, Since this is just a curiosity at this time, let's figure 50 watts, 0.25uV, & 500khz split. I figured that was the case about the vertical separation, but threw it in anyway. One site would be a solar site, so it would make sense to make it the RX. Guess it might require a notch can at the rx site, based on what Chris said. BTW, what software package are you using? I've been using Radio Mobile for coverage, & it works pretty good. Thanks, Tim W5FN
