I would also look at the termination of the Cat 5 cables as well as looking at any router which is in the system-we have seen, as numerous sites, that Wi-Fi switches and routers are not very well shielded and produce a TON of garbage in the 140-172 MHz band at least-I am not sure what components are used by the most recent Canopy systems but would bet there is a router or switch someone in the system
From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of ve1ii Sent: Monday, August 31, 2009 2:30 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: information requested re broadband internet canopy equipment interference Hi Rodney and others. The CAT5 cables are definitely shielded and I suspect that they are properly terminated. There are 10 CAT5 cables in total and an LMR200 cable. I suspect the LMR200 goes to a GPS unit which is on the tower. Six of the CAT5's go to the six panels and likely the other four are used on dishes on the tower that pick up and relay the signals coming to the tower. The VHF repeater is using a Sinclair 210-C4 on the top of the tower with the panels mounted just below that (approx. 10 feet down) The repeater is multicoupled to the 210-C4. All feedlines for VHF and UHF antennas is hardline. The power supplies for the panels are switching type. The noise is across the VHF band. Thanks for the comments so far. > > Has the Canopy system been installed using shielded cat5/cat6 cable? The EMI certification is only applicable if shielded cables are used (and properly terminated). > > What sort of antenna is your system using? How much vertical/horizontal separation from the Canopy system? Above or below? > > Does the Canopy have one or two cables running to each panel? If one, the power, sync and data is carried on the same cable. If shielded cable has been correctly used, the cable radiation should be minimal (provided good quality cable with 100% shield coverage is used). > > If there are 2 cables, the sync signal crom the Cluster Management Module (CMM) is on a separate cable. If that cable is not shielded, it could be radiating. > > Rodney. > > ===================================================================== > Rodney Baker VK5ZTV > rodney.ba...@... > ===================================================================== >
