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Topic: 500-1000ft. range wireless communication (Read 10 times) previous topic - next topic

Ran Talbott

What volume of data are you sending?  An Xbee may not have the bandwidth you need:  they max out at 115K, even under ideal circumstances.

Only slightly more expensive would be to set up a couple routers, reflashed with dd-wrt, with Yagi antennas to maximize range and avoid interference.  That would give you an Ethernet link for cameras and such, plus (if you pick the right router) a TTL serial port to interface to an Arduino.

For a really solid, professional 900MHz link (though also limited to 115K), check out the MaxStream radios from Digi.  I know people who've done 10-mile-plus links with them under near-ideal conditions (central node on a mountain top, in the desert).

CowJam

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Only slightly more expensive would be to set up a couple routers, reflashed with dd-wrt, with Yagi antennas to maximize range and avoid interference.

Isn't the frequency wifi uses not particularly good for distance?

Ran Talbott

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Isn't the frequency wifi uses not particularly good for distance?

Yes, and part of the reason it was chosen is that it enables relatively-close networks to operate without "jamming" each other.

But 1000 feet isn't a huge distance.  By using highly-directional antennas, like a Yagi,  you can "focus" the transmitted energy so much more of it lands on the intended target,  instead of scattering in all directions.  That means a link that would work poorly,  or not at all,  with omni-directional antennas can be rock-solid.   Plus, out in the country there are very few competing WiFi nets,  so the signal-to-noise ratio also goes up,  and the odds that you'll accidentally mess up a neighbor's network go way down.

This wouldn't necessarily work well in the cities or suburbs, but is probably fine for Keven.

CowJam

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This wouldn't necessarily work well in the cities or suburbs, but is probably fine for Keven.


I hadn't spotted his second post.

He's already got his remote location networked, he'd be better picking up a couple of ethernet shields.

retrolefty

And an improved/better/higher antenna is the one single device that can improve both transmitter range and receiver sensitivity for the same dollar investment.

Lefty

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