Patrick- Got everything except the EMI gasket - didn't know that existed but sounds cool. I've looked into http://www.zero-ground.com/ for the liquid tight but went with cheap-o hardware store instead. Not a PoE switch, "hacked" as you say - but in a professional way. (: Canopy Cyclone APs encased in metal housings, grounded and all the good stuff..
Thanks for your help - I just didn't know if that filter would be any benefit at all or not, I'll give it a shot and see how we do, thanks again. `S -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Patrick Shoemaker Sent: Thursday, April 15, 2010 2:25 PM To: WISPA General List Subject: Re: [WISPA] EMI Filtering Yes, I'd start by putting that filter you found on the incoming power to the switch enclosure. Also, -Make sure the door is bonded to the enclosure cabinet with a ground strap at minimum, preferably metal EMI gasket around door seal also -Keep the size of any enclosure penetrations to a minimum, though at FM frequencies you should be okay here -Make sure the liquid tight is bonded to the enclosure and APs -Make sure AP cases are bonded to enclosure through equipment grounds -You're using shielded RJ45's at both ends of the STP between switch and APs, right? Is this a PoE switch or is there some hacking of the ethernet cables going on to inject power for the APs? What kind of APs? Patrick Shoemaker Vector Data Systems LLC shoemak...@vectordatasystems.com office: (301) 358-1690 x36 http://www.vectordatasystems.com Scott Vander Dussen wrote: > Installing APs on a FM tower. Fiber from base of tower > fib/copper switch > at AP location. STP encased in flexible metal liquid tight from fib/copper > switch NEMA enclosure to APs. APs are getting eth port errors when in > 100FDX, locking in 10FDX solves the issue. > > 24VDC is injected in to each AP in the NEMA enclosure - I have ferrite beads > on both ends of the STP (near switch and base of AP) but problem remains. > Additional ferrite beads on the DC power line, still have issues. I believe > the majority of EMI is entering through the power cable. I did not run a > shielded power cable or power through coax or anything intelligent like that > - just a standard 2-16ga outdoor cable. So I'm looking for something to just > drain off any conducted FM EMI off that 24VDC power line before it gets > injected directly on the CAT5 that feeds those APs. > > Thanks for reading! > `S > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of Patrick Shoemaker > Sent: Thursday, April 15, 2010 12:21 PM > To: WISPA General List > Subject: Re: [WISPA] EMI Filtering > > Off the ethernet line or power? The EMI filter you posted should do the > trick for DC power. For ethernet, the "WISP approved" method seems to be > adding ferrite beads to the cat-5 cable at the end. I've never done this > myself. Tell us a little more about the problem you're trying to solve... > > > Patrick Shoemaker > Vector Data Systems LLC > shoemak...@vectordatasystems.com > office: (301) 358-1690 x36 > http://www.vectordatasystems.com > > > Scott Vander Dussen wrote: >> Any suggestions for filtering off FM noise? >> >> -----Original Message----- >> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >> Behalf Of Patrick Shoemaker >> Sent: Thursday, April 15, 2010 12:03 PM >> To: WISPA General List >> Subject: Re: [WISPA] EMI Filtering >> >> This is for Canopy radios: >> >> http://www.wbmfg.com/products/accessories/surge-suppressor >> >> Test port, voltage/current indicator LEDs, lightning protection. >> Weatherproof enclosure. >> >> >> Patrick Shoemaker >> Vector Data Systems LLC >> shoemak...@vectordatasystems.com >> office: (301) 358-1690 x36 >> http://www.vectordatasystems.com >> >> >> RickG wrote: >>> Lightning season is when I miss my home state of California the most. >>> You really dont know what your missing! I feel like the British must >>> have felt in WWII during the German bombing runs. Every year, boom, >>> boom, boom. (sorry for the dramatics). >>> Neither did I include an LP/EMI device in my business model but I also >>> didnt count on so many truck rolls. It just becomes a matter of which >>> is more cost effective and beneficial to customer satisfaction. I too >>> prefer that the customer be there but obviously this is only a side >>> benefit along with ease of access. >>> At any rate, you're "maintenance adapter" is right on target but I'm >>> not big into home made stuff. So, I'm hoping someone knows of a device >>> out there that incorporates these features and is factory made. >>> -RickG >>> >>> On Thu, Apr 15, 2010 at 12:33 PM, Scott Vander Dussen >>> <sc...@velociter.net> wrote: >>>> Rick- >>>> Obviously this application is for a tower (hence APs..). Our pricing >>>> model doesn't permit us the extra $20-30 per customer plus installation >>>> time etc. to install a LA/EMI Filter for every customer. Lighting isn't >>>> really a problem where we are (California) - Since we started in 2002 >>>> never had a single tower, customer, anything negatively affected by >>>> lighting. >>>> >>>> That being said - we don't like to do a maintenance call when the customer >>>> isn't home b/c then you can't get to their equipment (which may be the >>>> problem) or their power supply for the radio etc. When we need to, and >>>> the customer isn't home - we have simple "maintenance adapter" that we >>>> made - it has two RJ45 jacks and a short CAT5 cable coming out. The >>>> adapter is placed in-line between the radio and PoE CAT5 (to customer's >>>> power supply in home) - the short CAT5 goes plugs into the radio and the >>>> remaining RJ45 port has access to the network only (PoE pins removed) for >>>> use in your laptop. >>>> >>>> Down side is it requires rebooting CPE to install (unplugging cable) and >>>> also you need to get access to CPE which can be difficult sometimes. >>>> >>>> `S >>>> >>>> >>>> -----Original Message----- >>>> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >>>> Behalf Of RickG >>>> Sent: Thursday, April 15, 2010 9:23 AM >>>> To: WISPA General List >>>> Subject: Re: [WISPA] EMI Filtering >>>> >>>> This is inline with my previous question about a lightning protector. >>>> Would it be a good idea to incorporate a unit that does filtering/LP >>>> in a small enclosure on the outside of the home/business with an >>>> ethernet port for easy access to the network rather than having to >>>> depend on the customer to be there? >>>> >>>> On Thu, Apr 15, 2010 at 11:43 AM, Scott Vander Dussen >>>> <sc...@velociter.net> wrote: >>>>> Looking to filter conducted FM EMI off a 24VDC power line that supplies >>>>> Canopy APs with power. Would something like this be appropriate, or even >>>>> on the right track? >>>>> <http://bit.ly/a3WKJ9>http://bit.ly/a3WKJ9 >>>>> >>>>> Thanks, >>>>> `S >>>>> >>>>> >>>>> -------------------------------------------------------------------------------- >>>>> WISPA Wants You! Join today! >>>>> http://signup.wispa.org/ >>>>> -------------------------------------------------------------------------------- >>>>> >>>>> WISPA Wireless List: wireless@wispa.org >>>>> >>>>> 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: wireless@wispa.org >>>> >>>> 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: wireless@wispa.org >>>> >>>> Subscribe/Unsubscribe: >>>> http://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>>> >>> -------------------------------------------------------------------------------- >>> WISPA Wants You! 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