Re: [SOCALWUG] WiFI over water

[Jeff Kutz]

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

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