Might want to check into what the sealand guys are running at Havenco... http://www.sealand.org i believe, i know they have some big wireless links over water
Cheers, Geoff Shively, CTO PivX Solutions, LLC Are You Secure? http://www.pivx.com ----- Original Message ----- From: "Chris" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, September 11, 2003 12:17 PM Subject: Re: [SOCALWUG] WiFI over water > > reminds me of that 72-mile WLAN link from san diego to the san clemente > islands. > http://www.computerworld.com/mobiletopics/mobile/story/0,10801,76118,00.html > http://computerworld.com/mobiletopics/mobile/story/0,10801,75830,00.html > quote: > 'Ma agreed. He said 72 miles "is a truly amazing feat," especially over > water, where reflections can inhibit the signal.' > > You might be able to ask them about water issues first hand. > http://hpwren.ucsd.edu/ > > Chris > > > > > ----- Original Message ----- > From: "Jeff Kutz" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Thursday, September 11, 2003 3:04 AM > Subject: Re: [SOCALWUG] WiFI over water > > > > When I first got interested in the subject of WiFi, I read about a link, I > > believe it was in Hawaii, where they went some 20+km over water. They had > a > > picture from one of the sites and it looked like they were quite high over > > the water. It looked like they were going from a hill/mountain to another > > hill/mountain. They didn't report any water-specific problems. They did > use > > a hi-gain antenna but the idea was the long range of the link so this is > to > > be expected. > > > > I would say, "Go for it, and report back....." > > > > regards, > > > > Jeff > > > > > > > > >From: Andy Middleton <[EMAIL PROTECTED]> > > >Reply-To: [EMAIL PROTECTED] > > >To: SOCALWUG <[EMAIL PROTECTED]> > > >Subject: [SOCALWUG] WiFI over water > > >Date: 11 Sep 2003 09:23:15 +0100 > > > > > >Jack, > > > > > >Another small challenge! I'm planning to make a 3 or 4 km link over the > > >sea across a small bay here in Tenerife. One side of the link is fairly > > >high (40-50m above sea-level), but the other is at half the height > > >(20m). In theory I am not infringing the Fresnel zone (at 3 miles is > > >almost 8m), but I am slightly concerned over possible reflections from > > >the sea. I know that normally water absorbes microwaves, so I don't > > >think it will be a problem, but I wondered if, on those days of > > >dead-calm, there could be any reflection; the signal is almost parralel > > >to the water, I am using horizontal polarisation: what is the worst that > > >could happen to the link? > > >Now that we're talking about it, how low can I go with my link? What > > >would happen with vertical polarisation? Are there any "water-effects" > > >that I have to be especially aware of? That I can even take advantage > > >of? Could one "reflect" ALL of the signal? WOuld that be usefull? > > > > > >Sorry if its abit long! > > > > > >Andy Middleton > > > > > > > _________________________________________________________________ > > Express yourself with MSN Messenger 6.0 -- download now! > > http://www.msnmessenger-download.com/tracking/reach_general > > > >
