Todd For a PtP link there are not an FCC issues. The rule for PtP is for every 1 dBm taken off the power output of the standard (which is 30dBm) you can increase the antenna gain by 3dBi. So for 200mW or 23dBm this is:
30dBm-23dBm=7dBm > 7dBm * 3 = 21dBi + 6dBi (from the standard) = 27dBi So the max EIRP for a 200mW card is 23dBm+27dBi = 50dBm. Also check out our calculator, provides a for more versatility: http://www.demarctech.com/techsupport/cals/link-budget-calcs.htm Sincerely, Tony Morella Demarc Technology Group, A Wireless Solution Provider Office: 908-996-7995 Cell: 908-246-9170 Fax: 908-847-0202 http://www.demarctech.com > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]] On Behalf Of Support > Sent: Monday, February 03, 2003 5:40 PM > To: [EMAIL PROTECTED] > Subject: Re: [BAWUG] 25 mile link questions > > > The numbers work well for a link. You can use calculators at > YDI (http://www.ydi.com/calculation/som.php) to show that a > link will work (or not work) with whatever power & antenna you have. > > However, technically, 200 mw Radios into a 24 dBi antenna > would not likely be legal. 200 mw is 23 dBi, and with the 24 > dBi antenna, you're transmitting with 47 dBi, which is over > the legal limit. Of course, you'll also loose a bit in > cables and connectors depending on where your radios are, but > if your radios are up the tower and wired directly to the > antennas, then you'll be over limit. > > My recommendation would be to use YDI's great calculators > to figure out what's legal and will work well. :-) > > - Todd Chamberlain > > ----- Original Message ----- > From: "Chris Barcellos" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Monday, February 03, 2003 4:22 PM > Subject: [BAWUG] 25 mile link questions > > > > I am in the process of doing background research for a 25 > mile link > > that i want to build between my home, and my place of work. > My job has > > a 350ft tall tower (I can place my gear at 200ft, possibly > higher) and > > my home will eventually have a 40-foot triangular > (climable) tower. I > > was thinking about putting soekris boxes on both sides, and > using the > > wonderful 200mW cards with 24dBi gain parabolic antennas. > Now for my > > question: Will the 200mW cards and the 24dBi gain antennas be > > sufficant? If so, what speed link could I achive? Could > this link be > > done withing FCC specs for the band? > > > > I know that there are programs out there (radio mobile) that can be > > used for link calculations; I just wanted to get a real > world answer > > from people who have built and designed this type of link > in the past. > > > > Thanks, > > Chris > > > > > > -- > > general wireless list, a bawug thing <http://www.bawug.org/> > > [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless > > > > > -- > general wireless list, a bawug thing <http://www.bawug.org/> > [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless > -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
