Re: How to...

godson <godson.32ldih@no-mx.wirelessforums.org> hath wroth:

>Hi to all i need some info, what specs to look for when buying NON LINE
>OF SITE p2p AP and type for long range 8-10 miles.

Specs? There are only three; price, LOS, and speed. Everything else
is secondary.

If you have enough money, 8-10 miles is easy. If you don't, it's not
going to happen. Are you ready to spend about $15,000 on this project
for a licensed wireless link? That's what it will take to get that
kind of range across a crowded city (assuming you can find a
coordinated frequency and path). Otherwise, such ranges are
impossible on the unlicensed bands due to interference from other
users.

LOS is line-of-sight. You either have it or you don't. If you don't,
you're not going to communicate without heroics (repeaters,
reflectors, multiple links, etc). If you have line of sight,
including the Fresnel Zone clearance, wireless works just fine.

Speed can always be traded for range. Twice as far shows up as a 4
times decrease in speed. You might be able to go 8-10 miles, but you
won't go very fast.

Here's a sample link calculation:
<http://wireless.wikia.com/wiki/Wi-Fi#Link_Calculations>
If you find some likely candidates for your link, run the numbers. If
your fade margin is inadequate, you may have a link, but it won't be
very reliable.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558