Something I've heard talked about in ham/engineering circles is don't have cable runs that are near a half wavelength or multiple half wavelengths of the frequency that's giving you trouble. It's a last ditch effort but it might be worth thinking about. Ferrites are great. When you put them along the cable again avoid half wave length intervals. You want to do everything to discourage the cable from resonating at the interfering frequency.
Greg On Feb 29, 2012, at 12:31 PM, Marlon K. Schafer (509-982-2181) wrote: > This problem is a bitch. We're on a station that's "only" 20k watts and > Ethernet issues are severe. > > We finally had pretty good luck by moving the radios down and running high > grade coax to the antennas. We also run metal shielded cat5 with the proper > ends. > > Finally I installed ferrite beads on both ends of all cat 5 runs. > > Things are running pretty well now. Turns out that cat5 and fm radio are > basically in the same frequency area. > > My best advice? Go find a different tower to use :-). > > But it can be done. All electronics in a metal enclosure also. Jumper cat5 > also needs to be shielded cable with grounded connectors. Sometimes I put > ferrite beads on them as well. > > marlon > > ----- Original Message ----- > From: "Tim Warnock" <[email protected]> > To: "'WISPA General List'" <[email protected]> > Sent: Tuesday, February 28, 2012 6:15 PM > Subject: [WISPA] ethernet and towers with FM transmitters > > >> Hi All, >> >> I have a question as to how other operators are handling POE radio links >> and >> high power FM transmitters. >> >> We often see things like a radio will run errors or drop to 10mbps instead >> of 100mbps until we find a good position on the tower that its happy with. >> Once its happy we never have an issue again. >> >> We've tried earthing, not earthing, STP, UTP. Nothing seems to >> definitively >> solve the issue. >> >> Does anyone have any advice they'd like to share? It would be muchly >> appreciated. >> >> Thanks >> Tim >> >> _______________________________________________ >> Wireless mailing list >> [email protected] >> http://lists.wispa.org/mailman/listinfo/wireless > > _______________________________________________ > Wireless mailing list > [email protected] > http://lists.wispa.org/mailman/listinfo/wireless _______________________________________________ Wireless mailing list [email protected] http://lists.wispa.org/mailman/listinfo/wireless
