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
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