Thanks to everybody I wll go with the duplexers --- On Sat, 5/29/10, ZPO <[email protected]> wrote:
From: ZPO <[email protected]> Subject: Re: [Repeater-Builder] GMRS Repeater ANT (UHF) To: [email protected] Date: Saturday, May 29, 2010, 10:22 PM I trust Eric's experience and software more than my SWAG any day. Given the prices for mobile notch duplexers, I don't see a reason not to use one. 73-N5VFF/Brian On Sat, May 29, 2010 at 10:05 PM, Eric Lemmon <[email protected]> wrote: > Robert, > > I put 50 watts and 0.3 uV at GMRS frequencies into my Comm Shop for Windows > program, and it suggests that 73 dB of isolation is needed to avoid desense. > This amount of isolation can be achieved with about 39 feet of vertical > antenna separation or about 1020 feet of horizontal separation. Since you > can use a typical mobile notch duplexer for this application, it hardly > makes any sense to erect a tower so that you can run two antennas. Even so, > you should elevate your antenna as much as possible if you expect to get any > decent range. > > 73, Eric Lemmon WB6FLY > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Robert Boles > Sent: Saturday, May 29, 2010 9:46 PM > To: [email protected] > Subject: Re: [Repeater-Builder] GMRS Repeater ANT (UHF) > > > > it is 50 watts out, its at my home , and no other repeater with miles of > this location and i have the ant and hard line > > --- On Sat, 5/29/10, ZPO <[email protected]> wrote: > > > > From: ZPO <[email protected]> > Subject: Re: [Repeater-Builder] GMRS Repeater ANT (UHF) > To: [email protected] > Date: Saturday, May 29, 2010, 9:18 PM > > > > Depends on the power level. What type of site will the repeater be > located at? A duplexer is probably going to be cheaper than a 2nd > antenna and 2nd run of superflex. > > 73-N5VFF/Brian > > On Sat, May 29, 2010 at 7:21 AM, Robert <[email protected] > <http://us.mc802.mail.yahoo.com/mc/compose?to=bobeic2%40yahoo.com> > wrote: > > how much space is needed between the TX and RX ant and which type > of cable to use ? > > > > > > > > ------------------------------------ > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > >
