Date: Thu, 15 Apr 2004 09:05:19 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: scott@igc.org Cc: freebsd-mobile@freebsd.org Subject: Re: Hams Report 85-mile 802.11b File Transfers @ Oregon Message-ID: <20040415.090519.106533486.imp@bsdimp.com> In-Reply-To: <04041413050408.02105@sandino.dnsalias.org> References: <407D7323.50001@pacbell.net> <04041413050408.02105@sandino.dnsalias.org>
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In message: <04041413050408.02105@sandino.dnsalias.org>
Scott Weikart <scott@igc.org> writes:
: I would assume the hams used directional antennas on both ends, and
: carefully pointed the antennas at each other.
:
: So, this may have little relevance to monitoring people's
: mostly-omnidirectional wireless LANs. Well, maybe you could so some
: math to make the ham's numbers scale, but I would guess there are
: more direct methods to measure/compute risk.
Well, if I put a 30dBm dish on my end, then you still have a problem.
I had a 24dBm dish that I played around with from the water tower near
my house. I saw like 300 different networks... Not all of them well,
but if I really wanted to eaves drop on any of them, I could do so...
Some of them were confirmed to be a few couple miles away.
Warner
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