correct. also if you have a radio like the Cambium PMP450 you need to ground the radio ground lug to the tower.
if you have a radio like the cambium PMP100 (FSK) you don't gound the radio, it's in an all plastic case so you just let it float. On Wed, Nov 19, 2014 at 10:35 AM, Craig Schmaderer via Af <af@afmug.com> wrote: > 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 <402-372-1975> | Fax: 402-372-1058 <402-372-1058>* > > *Direct: 402-372-1052 <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 > 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> > 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 <402-372-1975> | Fax: 402-372-1058 <402-372-1058>* > > *Direct: 402-372-1052 <402-372-1052>* > > > > >
