On Wednesday, November 13, 2002, at 05:11 PM, Jim Thompson wrote:
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.
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.
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
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