Jim & the group: If you look at the photos, & I believe one of the descriptions, you'll notice that they are using 1 watt amps... I won't do the math...
kk -----Original Message----- From: [EMAIL PROTECTED] [mailto:wireless-admin@;lists.bawug.org]On Behalf Of Jim Thompson Sent: Wednesday, November 13, 2002 17:11 To: Daniel Kluge Cc: [EMAIL PROTECTED] Subject: Re: [BAWUG] HPWREN does 72 miles with 802.11b 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=/mc/ > 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
