Wireless bridge

Thu Jun 18 17:56:52 UTC 2009

On Thu, 2009-06-18 at 09:34 -0700, John van Oppen wrote:

> -----Original Message-----
> From: Tim Huffman [mailto:Tim at bobbroadband.com] 
> Sent: Thursday, June 18, 2009 9:27 AM
> To: nanog at nanog.org
> Subject: RE: Wireless bridge
> 
> > The line of sight is all clear, no trees. Only one building along
> the
> way
> > has a rooftop of similar height, but the antennas are extended far
> above
> > the
> > roofline. We have used a rifle scope to confirm line of sight is all
> clear
> > at all angles.
> > 
> 
> Unfortunately, you can't necessarily rely on visual line of sight. At
> 800meters, the Fresnel Zone on your radio is about 14ft in diameter at
> the midpoint. You need to make sure that this is free of obstructions.
> 

Not only that, the radios may actually be screaming at each other at
those distances which will affect performance