Dan Yes this is TurboCell have been communicating with the person that installed the link, 802.11b would time out at that distance.
Sincerely Tony Morella Demarc Technology Group Office: 908-996-7995 Cell: 908-246-9170 Fax: 908-847-0202 email: [EMAIL PROTECTED] http://www.demarctech.com Open Chat Server http://www.demarctech.com:8000 Yahoo IM: tonymorella Wireless Solution Provider > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:wireless-admin@;lists.bawug.org] On Behalf Of Daniel > Gerald Kluge > Sent: Thursday, November 14, 2002 2:59 PM > To: Jim Thompson > Cc: [EMAIL PROTECTED] > Subject: Re: [BAWUG] HPWREN does 72 miles with 802.11b > > > > On Wednesday, November 13, 2002, at 05:11 PM, 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. > > > > Actually the article says that the resulting speed is > 1MBit/s, which I > interpreted as a fallback to 802.11, in which case the > ACK+SIFS timing > should work, at least with a 1MBaud symbol rate. Also my > understanding > was that Karlnet/Turbo Cell by also has some range limits, > but it's not > clear to me, if that is pure RF or timing as well. > > Cheers, > -daniel > > > 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 > -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
