I'd be surprised if it were the building rather than the freeway causing your problem here.
In the end, it doesn't really matter what the cause is (could be a power line a few hundred yards away too). Try moving one end up OR down by as little as 2 feet. It could take much more, but sometimes the smallest amounts do the trick. Also try lowing the power level on the link so that you can't "see" the multipath. You might also try moving sideways with the link but that often takes much longer distances. marlon ----- Original Message ----- From: "Mike Hammett" <wispawirel...@ics-il.net> To: <wireless@wispa.org> Sent: Tuesday, October 27, 2009 10:49 PM Subject: [WISPA] Fresnel zone issues? > I'm looking at a link that has a possible issue. I've linked pictures. > > http://www.ics-il.net/images/Naperville%20-%20AT&T%20Plaza%20Radio%20Mobile%20zoom.png > > This is the building causing a problem. Each color ring is 1 meter of > elevation, meaning there's about 10 meters of height "error" in SRTM. It > appears to be a 10 story hotel with the peak in the center being a bit > more (other Google and MS angles). > > http://www.ics-il.net/images/Naperville%20-%20AT&T%20Plaza%20Radio%20Mobile%20overview.png > > This shows where Radio Mobile shows the most Fresnel incursion, with > stats. > > http://www.ics-il.net/images/Naperville%20-%20AT&T%20Plaza%20Google%20Earth%20zoom.png > > This is where Google Earth shows the link. > > So does this pose a link with a 60' ground clearance into a 100' building? > > First time I had a link that went through an area with a tall building and > a gross SRTM error. > > > ----- > Mike Hammett > Intelligent Computing Solutions > http://www.ics-il.com > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
