From way back when I was an electrical engineering student, ground one end. Or ground every 10 to 20 feet along the run. Otherwise you have the potential for a ground loop, which means you have current running through the shield and then through the tower. That can induce it's own noise into the cable.
Here is the key: Single Point Ground. The idea is to do your best to keep everything at the same voltage potential. So everything comes back to one place. So, while Jayson is right to a point about creating an antenna, the solution is different than he suggests. You want to have the drain wire do what it's name says, drain the stray signals to ground. For some installations, using the metal connector on one end works. That is, assuming that the board ground in directly connected to the single point ground. My personal preference is to directly connect the drain wire to the ground point, but the key is that you have one ground point and no current flowing through the ground wires. Jayson Baker wrote: > If you don't ground both ends you're creating a huge "antenna" to pick up > static and drain it right into your board/POE. > Always use shielded connectors on both ends, and ground both ends. > > On Tue, Aug 4, 2009 at 7:26 AM, Scott Carullo > <[email protected]>wrote: > > >> While we are on the STP topic... It's been noted several times that you >> are only supposed to ground ONE end of the STP shield otherwise you are >> creating for yourself a ground potential difference. The idea behind the >> shield is just that - shield noise away shunted to ground. On a typical >> install lets cal this the radio side use plastic connector and inside use >> grounded one with tall the other lightning goodies. What is the consensus >> on this while we are on topic :) >> >> Scott Carullo >> Brevard Wireless >> 321-205-1100 x102 >> >> -------- Original Message -------- >> >>> From: "Chuck Hogg" <[email protected]> >>> Sent: Monday, August 03, 2009 11:10 PM >>> To: "WISPA General List" <[email protected]> >>> Subject: Re: [WISPA] Defective Microtik >>> >>> Yea, we solder and heat shrink the ends on all our tower gear. Less >>> problems, but still doesn't stop direct strikes, lol. >>> >>> Regards, >>> Chuck Hogg >>> Shelby Broadband >>> 502-722-9292 >>> [email protected] >>> http://www.shelbybb.com >>> >>> >>> -----Original Message----- >>> From: [email protected] [mailto:[email protected]] On >>> Behalf Of Jayson Baker >>> Sent: Monday, August 03, 2009 11:09 PM >>> To: WISPA General List >>> Subject: Re: [WISPA] Defective Microtik >>> >>> Yea... I don't think it's black, just how the picture was taken. It's >>> usually a silver or gold wire, seperate from the others and not >>> insulated. >>> Sometimes it's stranded as opposed to being solid. You don't >>> necessarily >>> have to solder it - but make sure it's got a good electrical connection >>> to >>> the shielded RJ45 connector. And that the shield of the RJ45 connector >>> has >>> a good electrical connection to the boards plug. And the antenna to the >>> board. And the RJ45 to the POE, and POE to ground. >>> >>> You get the idea. >>> >>> Like I said, we have thousands of these in service in Colorado--all that >>> use >>> shielded cable have no problems at all. Those that don't are guaranteed >>> problems sooner or later. >>> Our Costa Rica operation doesn't use shielded cable (supposedly it's too >>> costly to import), so everytime there's a storm dozens of boards are >>> thrown >>> away. >>> >>> On Mon, Aug 3, 2009 at 8:46 PM, Josh Luthman >>> <[email protected]>wrote: >>> >>> >>>> *Face plant* >>>> >>>> Never heard of those before... >>>> >>>> I'm assuming the black wire in this picture is the drain wire? It >>>> >>> doesn't >>> >>>> drain water, but is conductive - is this right? >>>> http://en.wikipedia.org/wiki/File:FTP_cable3.jpg >>>> >>>> Josh Luthman >>>> Office: 937-552-2340 >>>> Direct: 937-552-2343 >>>> 1100 Wayne St >>>> Suite 1337 >>>> Troy, OH 45373 >>>> >>>> "When you have eliminated the impossible, that which remains, however >>>> improbable, must be the truth." >>>> --- Sir Arthur Conan Doyle >>>> >>>> >>>> On Mon, Aug 3, 2009 at 10:39 PM, Jayson Baker <[email protected] >>>> >>>>> wrote: >>>>> >>>>> Uhm, if you use shielded cable, you must use shielded connectors. >>>>> Using unshielded connectors, with shielded cable, is like having a >>>>> >>> 100' >>> >>>>> long >>>>> lightning/static pickup cable that will drain right into your board. >>>>> >>>>> Shielded connectors, shielded cable, drain wire soldered on, into a >>>>> >>> good >>> >>>>> grounded POE injector == no problems for many years >>>>> >>>>> On Mon, Aug 3, 2009 at 8:36 PM, Josh Luthman < >>>>> >>>> [email protected] >>>> >>>>>> wrote: >>>>>> >>>>>> You lost me - drain wire? Soldered onto a plastic rj45? >>>>>> >>>>>> Josh Luthman >>>>>> Office: 937-552-2340 >>>>>> Direct: 937-552-2343 >>>>>> 1100 Wayne St >>>>>> Suite 1337 >>>>>> Troy, OH 45373 >>>>>> >>>>>> "When you have eliminated the impossible, that which remains, >>>>>> >>> however >>> >>>>>> improbable, must be the truth." >>>>>> --- Sir Arthur Conan Doyle >>>>>> >>>>>> >>>>>> On Mon, Aug 3, 2009 at 10:27 PM, Jayson Baker >>>>>> >>> <[email protected] >>> >>>>>>> wrote: >>>>>>> >>>>>>> We also solder the drain wire from the cable onto the RJ45 >>>>>>> >>> connector >>> >>>>>> after >>>>>> >>>>>>> we crimp it on. >>>>>>> Key is to ensure you have a good ground from A to Z. >>>>>>> >>>>>>> On Mon, Aug 3, 2009 at 8:26 PM, Josh Luthman < >>>>>>> >>>>>> [email protected] >>>>>> >>>>>>>> wrote: >>>>>>>> >>>>>>>> I am using shielded cable and Pac POEs andd lost all 3 APs >>>>>>>> >>> here a >>> >>>> few >>>> >>>>>>>> weeks ago. >>>>>>>> >>>>>>>> On 8/3/09, Jayson Baker <[email protected]> wrote: >>>>>>>> >>>>>>>>> Try using shielded cable, and you won't have a problem. >>>>>>>>> We're installed thousands in Colorado (second worst >>>>>>>>> >>> lightning in >>> >>>>> the >>>>> >>>>>>>>> country, next to Florida) and everytime we install without >>>>>>>>> >>>> shielded >>>> >>>>>>>>> cable-it's junk after a storm. We use shielded cable on ALL >>>>>>>>> installs-customer installs as well. And the good grounded >>>>>>>>> >>>>>> PacWireless >>>>>> >>>>>>>> POE >>>>>>>> >>>>>>>>> injectors. With thousands in service, it's rare we get a >>>>>>>>> >>>> lightning >>>> >>>>>>>> related >>>>>>>> >>>>>>>>> service call. >>>>>>>>> We justify the extra couple dollars in cable by saving the >>>>>>>>> >>> cost >>> >>>> of >>>> >>>>>>> truck >>>>>>> >>>>>>>>> rolls, replacement equipment, and unhappy customers. >>>>>>>>> >>>>>>>>> On Mon, Aug 3, 2009 at 6:10 PM, Josh Luthman >>>>>>>>> <[email protected]>wrote: >>>>>>>>> >>>>>>>>> >>>>>>>>>> Every 133 I used had a problem. Be it software, hardware, >>>>>>>>>> >>> DOA, >>> >>>>>>>> lightning, >>>>>>>> >>>>>>>>>> whatever. Out of dozens out there none survived and were >>>>>>>>>> >>>>> replaced, >>>>> >>>>>>>>>> necessarily, by a newer board. >>>>>>>>>> >>>>>>>>>> Josh Luthman >>>>>>>>>> Office: 937-552-2340 >>>>>>>>>> Direct: 937-552-2343 >>>>>>>>>> 1100 Wayne St >>>>>>>>>> Suite 1337 >>>>>>>>>> Troy, OH 45373 >>>>>>>>>> >>>>>>>>>> "When you have eliminated the impossible, that which >>>>>>>>>> >>> remains, >>> >>>>>> however >>>>>> >>>>>>>>>> improbable, must be the truth." >>>>>>>>>> --- Sir Arthur Conan Doyle >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On Mon, Aug 3, 2009 at 8:05 PM, Dennis Burgess < >>>>>>>>>> >>>>>>> [email protected] >>>>>>> >>>>>>>>>>> wrote: >>>>>>>>>>> >>>>>>>>>>> Nothing that I have seen. Sure they were not repackaged >>>>>>>>>>> >>> by >>> >>>> your >>>> >>>>>>>> vendor? >>>>>>>> >>>>>>>>>>> And/or like I suggested overclocked. >>>>>>>>>>> >>>>>>>>>>> -----Original Message----- >>>>>>>>>>> From: [email protected] [mailto: >>>>>>>>>>> >>>>>> [email protected] >>>>>> >>>>>>> ] >>>>>>> >>>>>>>> On >>>>>>>> >>>>>>>>>>> Behalf Of Forbes Mercy >>>>>>>>>>> Sent: Monday, August 03, 2009 6:53 PM >>>>>>>>>>> To: WISPA General List >>>>>>>>>>> Subject: [WISPA] Defective Microtik >>>>>>>>>>> >>>>>>>>>>> Is anybody having problems with R433AH's Microtik cards >>>>>>>>>>> >>> out of >>> >>>>> the >>>>> >>>>>>> box >>>>>>> >>>>>>>>>>> lately? We purchased four this year so far and one >>>>>>>>>>> >>> beeped >>> >>>> once >>>> >>>>>> only >>>>>> >>>>>>>> on >>>>>>>> >>>>>>>>>>> 18v not higher or loser voltages but it never beeped >>>>>>>>>>> >>> twice or >>> >>>>> got >>>>> >>>>>> to >>>>>> >>>>>>>> an >>>>>>>> >>>>>>>>>>> interface we could use. >>>>>>>>>>> >>>>>>>>>>> We just installed another one and it now is giving kernel >>>>>>>>>>> >>>> errors >>>> >>>>>> and >>>>>> >>>>>>>>>>> unless authenticate all is on everyone loses registration >>>>>>>>>>> >>>> every >>>> >>>>>> few >>>>>> >>>>>>>>>>> hours. We updated the firmware but with no positive >>>>>>>>>>> >>> result. >>> >>>>>>>>>>> My costs for tower climbers and anger from the 150 >>>>>>>>>>> >>> customers >>> >>>> on >>>> >>>>>> the >>>>>> >>>>>>>>>>> radio that went bad the day after we installed it is >>>>>>>>>>> >>> getting >>> >>>>>> costly >>>>>> >>>>>>>> and >>>>>>>> >>>>>>>>>>> wearing on my staff. We're going back right now to >>>>>>>>>>> >>> reinstall >>> >>>>> the >>>>> >>>>>>> old >>>>>>> >>>>>>>>>>> 133 board. Any others having these problems? >>>>>>>>>>> >>>>>>>>>>> Forbes Mercy >>>>>>>>>>> President - Washington Broadband, Inc. >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>> ------------------------------------------------------------------------ >>> >>>>>>>>>>> -------- >>>>>>>>>>> WISPA Wants You! Join today! >>>>>>>>>>> http://signup.wispa.org/ >>>>>>>>>>> >>>>>>>>>>> >>> ------------------------------------------------------------------------ >>> >>>>>>>>>>> -------- >>>>>>>>>>> >>>>>>>>>>> WISPA Wireless List: [email protected] >>>>>>>>>>> >>>>>>>>>>> Subscribe/Unsubscribe: >>>>>>>>>>> http://lists.wispa.org/mailman/listinfo/wireless >>>>>>>>>>> >>>>>>>>>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>> ------------------------------------------------------------------------ >>> -------- >>> >>>>>>>>>>> WISPA Wants You! Join today! >>>>>>>>>>> http://signup.wispa.org/ >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>> ------------------------------------------------------------------------ >>> -------- >>> >>>>>>>>>>> WISPA Wireless List: [email protected] >>>>>>>>>>> >>>>>>>>>>> Subscribe/Unsubscribe: >>>>>>>>>>> http://lists.wispa.org/mailman/listinfo/wireless >>>>>>>>>>> >>>>>>>>>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>> ------------------------------------------------------------------------ >>> -------- >>> >>>>>>>>>> WISPA Wants You! Join today! >>>>>>>>>> http://signup.wispa.org/ >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>> ------------------------------------------------------------------------ >>> -------- >>> >>>>>>>>>> WISPA Wireless List: [email protected] >>>>>>>>>> >>>>>>>>>> Subscribe/Unsubscribe: >>>>>>>>>> http://lists.wispa.org/mailman/listinfo/wireless >>>>>>>>>> >>>>>>>>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>>>>>>>>> >>>>>>>>>> >>>>>>>>> >>>>>>>>> >>> ------------------------------------------------------------------------ >>> -------- >>> >>>>>>>>> WISPA Wants You! Join today! >>>>>>>>> http://signup.wispa.org/ >>>>>>>>> >>>>>>>>> >>> ------------------------------------------------------------------------ >>> -------- >>> >>>>>>>>> WISPA Wireless List: [email protected] >>>>>>>>> >>>>>>>>> Subscribe/Unsubscribe: >>>>>>>>> http://lists.wispa.org/mailman/listinfo/wireless >>>>>>>>> >>>>>>>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>>>>>>>> >>>>>>>>> >>>>>>>> -- >>>>>>>> Josh Luthman >>>>>>>> Office: 937-552-2340 >>>>>>>> Direct: 937-552-2343 >>>>>>>> 1100 Wayne St >>>>>>>> Suite 1337 >>>>>>>> Troy, OH 45373 >>>>>>>> >>>>>>>> "When you have eliminated the impossible, that which remains, >>>>>>>> >>>> however >>>> >>>>>>>> improbable, must be the truth." >>>>>>>> --- Sir Arthur Conan Doyle >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>> ------------------------------------------------------------------------ >>> -------- >>> >>>>>>>> WISPA Wants You! 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