Well what are you grounding on either end? At the base of the tower you actually go to earth - the radio itself isn't ground - the earth is, so only the ground at at the bottom.
On 8/4/09, Scott Reed <[email protected]> wrote: > 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! 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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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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/ >> >> ------------------------------------------------------------------------ >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com >> Version: 8.5.392 / Virus Database: 270.13.43/2281 - Release Date: 08/04/09 >> 05:57:00 >> >> > > -- > Scott Reed > Sr. Systems Engineer > GAB Midwest > 1-800-363-1544 x4000 > Cell: 260-273-7239 > > > > -------------------------------------------------------------------------------- > WISPA Wants You! 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