I went through this issue with a ham repeater at a mountain top tower. The repeater would key up and never let go as it saw some signal it thought was a user. I was in a metal cargo container and the repeater was in a frame building 20 feet away. I could turn off the ethernet switch and the interference would go away. I could leave the switch powered up and remove all the cat 5 cables to it and the interference would go away. It appears the ethernet switch was mixing several RF sources and emitting a sum or difference of the two (or more). I tried Ferrite rings on all cat 5 cables, shielded cable etc. Nothing really worked that well. Finally I moved 100' away to a different building on a different tower and no one is complaining now. Spacial separation seems to have fixed it.
Kurt Fankhauser wrote: > Has anyone else here ever been co-located on a tower with a HAM radio > (144-148mhz) VHF repeater or perhaps even a commercial system in the 150mhz > band and gotten complaints that your Ethernet cable is causing them > interference on their repeater? We are trying to locate the source of noise > on an amateur radio repeater system locally and last time I went up on grain > leg there was a whole lot of Ethernet cabling strung everywhere and I've > read some links such as these. http://www.hamuniverse.com/linksys.html that > apparently some brands of equipment give out much more spurious emissions > than others. > > > > Also how did you work with the radio people to solve it? Seems to only be > apparent in the VHF band. > > > > > > > > Kurt Fankhauser > WAVELINC > P.O. Box 126 > Bucyrus, OH 44820 > 419-562-6405 > www.wavelinc.com > > > > > > > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: [email protected] > > 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: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
