Has the link changed completely? Or does it come and go with time of day? Are both ends of the link at the same height? If so, the reflection point will be roughly half the path. If not, the reflection point will be closer to the lower antenna. Has anything changed in the terrain at the reflection point? Are these paths urban or rural? Could there be some new growth at the reflection point?
If the phenomenon has not passed, it may not be tropospheric ducting. Although ducting can persist for a day or so, if it's still degraded, probably not. If the path is over an urban are it may be Rayleigh fading, or Rician fading if the path is over trees and such. Did someone else show up and start shooting across your path, especially at mid path? There is a wealth of knowledge on this list, but we still need some more info. Did all of the 3? paths degrade similarly? Mike >Both links are using Radiowave 3' high performance antennas. One >link is a pair of Orthogon units, the other are Trango Tlink10's and >a third 20mi link are Trango Atlases. > >This scenario is setup as an OSPF 'ring'. -------------------------------------------------------------------------------- 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/
