wanted: wireless magic tricks

Thu Aug 16 17:34:28 UTC 2001

On Thu, Aug 16, 2001 at 01:28:46PM -0400, Greg Maxwell wrote:
> I just ran some quick numbers, and a unlicenced 20mile link like that
> would be possible, but I wouldn't sell it.:
> 
> 1.75mw -> 36dBi antenna -> freespace -> 36dBi antenna -> reciever + mis
> losses, has an EIRP of about 3.9 watts (legal).
> 
> You'd have about 15db of link margin, and that's much too little for a
> reliable link IMO.

That's why I suggested two 10 mile links. :-)  There are a large
number of people in the 10-14 mile range with reliable links, and
very few people pushing further.

That said, some guy in NZ got around 35 miles as I recall using
off the shelf parts.  It no doubt exceeded FCC regs though, but
that's not an issue for him.

-- 
Leo Bicknell - bicknell at ufp.org
Systems Engineer - Internetworking Engineer - CCIE 3440
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