1.3mi PtP link. Suggestions?

[Ken Caruso]

On Wed, 2006-12-13 at 11:05 -0500, Steve Mickeler wrote:
> I'm in the planning stages of a 1.3mi link. It's a NLOS situationdue to
> some trees and rooftops.

Your calculations look good, but physical obstacles are real killers
especially at greater distances.  

> 
> I'm planning to use 2 x linksys WTR54GL units running DD-WRT.
> 
> Based on the following calculations, using a 2400MHz Tx frequency, the
> 1.31mi distance, along with a 200mW Tx power, -80dBm Rx sensitivity, 1dB
> loss for connectors and cable, and 14dB antenna gain on the Tx and Rx, I
> get a Theoretical System Operating Margin of 23.5 dB.

Where do you get the 200mw Tx power? Is that what the WRT54GL is rated
at? It sounds high for a linksys product. Is it using a power hack? 

> 
> This is using a helical antenna, chosen because it is of a circular
> polarization and according to my research, the best for getting through
> and around obstructions.  Now I may be incorrect on this which is why I'm
> asking here.

There is really only one way to find out. However 1 mile without LOS, I
would not get my hopes too high. 

-Ken

> 
> The antenna specs can be found here :
> http://www.wade-antenna.com/Wade/Helical.PDF
> 
> Would anyone care to comment on this setup?
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