On Thu, 2009-06-18 at 09:34 -0700, John van Oppen wrote:
-----Original Message----- From: Tim Huffman [mailto:Tim@bobbroadband.com] Sent: Thursday, June 18, 2009 9:27 AM To: nanog@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