Boy, that seems excessive to me, even at 500 kHz. My hunch is that you'll have acceptable performance much closer in distance. 1 MHz spacing was mentioned which would obviously be even better.
Chuck WB2EDV ----- Original Message ----- From: "Eric Lemmon" <wb6...@verizon.net> To: <Repeater-Builder@yahoogroups.com> Sent: Friday, January 22, 2010 12:19 AM Subject: RE: [Repeater-Builder] 6 Meter Repeater spacing (no duplexers) > 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: Repeater-Builder@yahoogroups.com > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tim Ahrens > Sent: Thursday, January 21, 2010 7:21 PM > To: Repeater-Builder@yahoogroups.com > 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 >
