>I have a 5 mile 802.11b link that works fine until air >temperatures exceed around 85 F. Over a period of about >an hour, the percentage of missed pings
In broadcast television studio transmitter links (STL's) are frequently designed with 'spatial' diversity for just this reason. By that I mean you would have two separate antennas spaced some vertical distance apart. A comparator in the receiver looks at each signal and makes a determination about which 'path' to use. Why go through this obvious explanation? Lots of time temperature inversions can create layers in the atmosphere that can change the path characteristics. This can result in the kind of periodic path changes you are seeing and are due to changes in the density of the atmosphere along the link. Fly into the Los Angeles basin on any hot smoggy day and the inversion layer becomes glaringly obvious. Wake up in the south bay region (Torrance, south of LAX) and you get something called 'June gloom'. The marine layer pushes in and can force hotter air layers up the mountain passes. Cheers, Chris Spacone www.infosci.com -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
