Jeremy, Spatial diversity on different polarities is going to be the best thing for you to overcome what your seeing. I'm not sure how easy that is to implement on a Mikrotik system... but I would strongly recommend looking at a system like the Radwin 2000 or Motorola Orthogon Radios...
Daniel White 3-dB Networks http://www.3dbnetworks.com >-----Original Message----- >From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >Behalf Of Jeremy Parr >Sent: Wednesday, October 28, 2009 7:21 AM >To: WISPA General List >Subject: [WISPA] Long 5Ghz link over water > >I have a 23 mile link completely over water that I cannot get stable. >One end is approx 200ft AGL, 220ft ASL, the other end is 50' AGL, 90' >ASL. Antennas are V-Pol 29dbi grids, radios are R5H cards. I have >tried the link at both 5.2, and 5.8, but it still fluctuates >dramatically. When the antennas were installed and configured for a >5Mhz channel, I was able to aim them to -55, but still they go down >during parts of the day. I have a second antenna hung on the 200ft >end, at about 185', connected to a second R5H set up for H-Pol which I >am going to light up as soon as I get the other end mounted H-Pol. Any >other suggestions for getting this stable? I also notice some >strangeness when doing bandwidth tests. I can get a steady 8mbps >downstream from the 200ft end to the 50' end, but from the 50' end to >the 200ft end, the transfer starts at about 6mbps, then slowly drops >down to 0, and the client radio (the 50' end) drops. My assumption is >multipath reflections off of the water at the lower end, but I cannot >be sure. The water is tidal, with as much as a 3' change from low to >high, and is connected to the ocean, so there can be considerable chop >and wave action on the surface. -------------------------------------------------------------------------------- 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/
