I had the same thing when they installed their antennas immediately adjacent to one of our 460 MHz repeaters. Swapping the TX/RX solved the problem. I suspect that one was transmitter related.
Joe M. wd8chl wrote: > Laryn Lohman wrote: >> An ISP installed some Motorola Canopy equipment with the antennas >> about 20 ft. horizontally from our 2M receive antenna. The noise >> floor went up at least 10db. In this case, I had the option of moving >> our antenna so it is now about 80 ft. horizontally away. No noise at >> all from their equipment now. >> >> I believe that the bulk of the noise is digital processing junk, not >> related to their transmitter(s). (But could easily be proven wrong on >> that one...) It's pretty broadband in the VHF region, but I have not >> heard any problem at all with a 70cm receiver using an antenna in the >> same position that the 2M antenna was mounted. >> >> Laryn K8TVZ > > Right. The Canopy that I have seen uses unshielded "satin" cable to the > antennas. Not even Cat5. And what's on those cables is essentially > 10-baseT data and power for the actual transceiver, I believe. > It would be VERY dirty in any case. > > > ------------------------------------ > > > > Yahoo! Groups Links > > > >
