72mi = 116km, "40 inch grid antennas" -> ~23...24 dBi P_tx_prism_2.5 = 16 dBm Rx_level = -115 - 20Log(116)+24 +24 +16 = - 92 dBm It is astable connection, is necessary: 96 -10(add Fading) = 86; 92- 86 = 6; P_tx = 16 + 6 =22 dBm = 160mW !!!!!!!!!!!
In Crimea use one year link =82km, 2_GL2411AP & 2_antennas_27dBi, Rx_level = -115 - 20Log(82)+27 +27 +14 = - 85 dBm Ivan Korshun http://www.vector.kharkov.ua > The article says 1 watt. > > Also if you look at the pictures, you'll see a poletop amp and DC injector. > > -- > Jeff King, [EMAIL PROTECTED] on 11/13/2002 > > On Wed, 13 Nov 2002 19:11:09 -0600, Jim Thompson wrote: > > > >FCC ptp rules in 2.4 say you're allowed up to 30dBm tx power with > >6dBi > >of antenna gain, > >and must reduce tx power by 1 dBm for every 3 dBi of antenna gain > >over > >6. > > > >Assume that the dish pictured is 30dBi (difficult, but not > >impossible): > >30 - (30-6)/3 = 22 dBm of tx power allowed. > > > >The Lucent/Orinoco/Agere cards used put up 18dBm, so I'd say they're > > > >running inside the rules. > > > >They must be running KarlNet/Turbo Cell on that link. Otherwise, > >the > >SIFS/ACK timing wouldn't work. If they > >are, then its not 802.11 (much less 802.11b!) While HPWREN never > >claims it as an 802.11(b) link, lots of other > >places (/., the original poster here) do. > > > >Jim > >p.s. note that you can run up to 23dBm (200mW) of tx power with a > >27dBi > >antenna (again, ptp rules). > > > >On Wednesday, Nov 13, 2002, at 15:50 US/Central, Daniel Kluge wrote: > > > >>I just stumbled over an article, that Hans-Werner Braun at HPWREN > >>upped > >>the ante a little bit for point-to-point links. They are doing 72 > >>miles > >>over water using 40 inch grid antennas and apparently standard Wi- > >>Fi > >>cards > >> > >>You can read it in HPWREN's press-release here: > >>http://hpwren.ucsd.edu/news/021101.html > >> > >>Or the following article (which has some errors in it): > >>http://story.news.yahoo.com/news?tmpl=story2&cid=77&ncid=77&e=2&u=/m > >>c/ > >>20021113/tc_mc/san_diego_wireless_net_installs_72_mile_2_4_ghz_link > >> > >>Cheers, > >>-daniel > >>-- > >>UNIX-looney for hire > >>-- > >>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 -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
