From: John De Armond
Subject: Re: Sat_ellite Dish Wifi
Date: Fri, 23 Dec 2005 14:00:49 -0500
On Fri, 23 Dec 2005 14:39:07 GMT, "FMB" <firstname.lastname@example.org> wrote:
>"loner" <email@example.com> wrote in message
>> Anyone using a satellite dish to
>> pick up city wifi transmissions?
>> How does it work?
>The new world record is claimed to be 125 miles for an unamplified wireless
>network. The winner used modified satellite dishes.
Until we parted company, one of my employees was using my network
connection via a WiFi link that was about 4 miles but not line of
sight. I used two DTV dishes with a simple USB WiFi dongle mounted in
the focus of each. There was a water tower on top of the hill blocking
our path. I skipped the signal off that tank.
The link was 100% except for VERY heavy fog and heavy rain.
>You may be more interested in a Cantenna or such to extend your reach but
>not by 125 miles. Look at http://www.cantenna.com/ if you are not the
>'builder' or try http://www.oreillynet.com/cs/weblog/view/wlg/448 if you are
>interested in building your own.
Those things don't work very well. A Pringles can is just too small
for the wavelength involved. One made from a pair of coffee cans
soldered together works better. One made from 3 #10 cans works fairly
well but the assembly is huge. The improvement people see when
connecting a Cantenna has more to do with the badness of the built-in
Wifi antenna rather than the goodness of the Cantenna. At least
that's been my experience.
When traveling I use a little homemade yagi antenna, constructed from
bits of aluminum rod and a section of large fishing rod. The rod is
used for the slip joint that allows the antenna to be broken down for
storage. I found the plans on the net somewhere.
Last year about this time when I was somewhere on the Gulf coast of
Florida sitting in a beach-side pulloff and shooting across the mouth
of a river at an office complex, looking for a link from which to
fetch email, that yagi was certainly useful. Even with the USB dongle
on top of the MH roof I could get no signal at all. With the yagi I
got several full scale signals.