Thanks, so just to confirm, you only ground it with the chuck rack, and on top you still use a shield connected so the radio gets connected, and no where else do you ground the cable to the tower or cut into the jacket?
Craig R. Schmaderer CEO | Skywave Wireless, Inc. Ph: 402-372-1975 | Fax: 402-372-1058 Direct: 402-372-1052 From: Af [mailto:af-boun...@afmug.com] On Behalf Of Sean Heskett via Af Sent: Wednesday, November 19, 2014 11:18 AM To: af@afmug.com Subject: Re: [AFMUG] New Cell tower install seeing a lot of CRC errors use these in the equipment room at the bottom of the tower: wbmfg.com<http://wbmfg.com> GigE-APC-HV http://wbmfg.com/products.cfm?PID=61 they slide into this APC rack mount: http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=PRM24&gclid=CPXz8JWUh8ICFeRzMgod4DwA3w or into this DIN rail mount: http://wbmfg.com/products.cfm?PID=39 use shielded RJ-45 connectors on both ends of the cable and make sure that the drain wire is firmly connected to the outside shielding (you are suppose to solder to the shield but in my opinion that is impractical up on a tower and if you crimp the connection correctly then you'll be fine) fyi the shielded wire may not solve the CRC issue completely and you may need to run your cables inside shielded liquidtight conduit. also you may want to invest in a nice fluke tester to ensure that the cable and crimp are working properly. -sean On Wed, Nov 19, 2014 at 9:53 AM, Craig Schmaderer via Af <af@afmug.com<mailto:af@afmug.com>> wrote: Ok guys, I know this has been talked about a few times about FM towers. We have a new site, that has about 20 cell phone antennas on it and maybe 8 private band handheld radio antennas. We are seeing crc errors on all the radios, not really effecting overall traffic, but I would like to fix it. I have only used really good CAT5 cable for about 10 years now in my area on all of our towers with great success. We never have lightning issues unless it’s a direct hit and the radio blows up. What I am wondering is that maybe when I used shielded cable 10 years ago to connect to cisco aps, we always popped the ports on them. Granted I didn’t know much back then and I don’t believe I had the shielded cable grounded right. So what I’m asking, I assume the best way to fix this is with shielded cable. How do most people setup the shielded run. So do I go into a chuck ground with a shielded end connected to the drain wire at the bottom and then do I go into a chuck ground at the top too? Or do I strip the jacket and ground the shield to the tower? I guess I don’t want to just guess and loose radios in lightning storms again, can someone let me know what great results they have in the way they ground the run? Thanks, Criag. Craig R. Schmaderer CEO | Skywave Wireless, Inc. Ph: 402-372-1975<tel:402-372-1975> | Fax: 402-372-1058<tel:402-372-1058> Direct: 402-372-1052<tel:402-372-1052>
