It's actually a hotel up on a hill. There is a cell phone tower nearby, no new stuff that we can see, but we'll scan as soon as we can. Randy
jp wrote: > I would suspect something on the same tower. Do you keep an online > inventory of all your ap's/backhauls at all of your sites, and what > frequencies they use? Review that before going out. > > I like the spectrum analyzer in the alvarion VL radios. Tells what OFDM > and non-OFDM stuff it picks up and separates the data. > > We also have an HP (now agilent) 8569b 10mhz-22ghz analyzer which still > sells on ebay for what I paid for it 8 or more years ago. It's great to > hook an antenna up to, scan around, looking at the screen to see it > peak, change polarities, etc... Newer more expensive ones have lcd > displays, are lighter, hook up to computer, etc... Use a low gain > antenna (20db or less) at 5ghz though, as the small antenna beamwidth > makes it easy to miss things. > > On Mon, Oct 12, 2009 at 02:05:17PM -0600, Randy Cosby wrote: > >> Well, we replaced the backhaul (osbridge) and get the same readings on >> the new one. The old one does not get the same readings when moved to >> another location, so it's picking up SOMETHING. Powered down everything >> else, same problem. So, someone is slamming me with a ton of signal >> near 5875... Now to find out where it's coming from. >> >> Any recommendations for a 5 gig spectrum analyzer? Ubiquiti airview >> looks interesting, but only for 2.4 and 900. Guess I can use the >> built-in one in the osbridge, but it's not too fast / granular. >> >> Randy >> >> >> Randy Cosby wrote: >> >>> Did that - don't have the results here with me, but there was quite a >>> poor noise floor around the middle of the band - just like the osbridge >>> reported. Not nearly as severe though. >>> >>> Randy >>> >>> >>> Scott Carullo wrote: >>> >>> >>>> Just do a survey on the AP, really thats all that matters... its easy >>>> takes a few minutes and you have the data you need to make educated >>>> decision. >>>> >>>> Scott Carullo >>>> Brevard Wireless >>>> 321-205-1100 x102 >>>> -------- Original Message -------- >>>> >>>> >>>> >>>>> From: "Randy Cosby" <dco...@infowest.com> >>>>> Sent: Monday, October 12, 2009 11:45 AM >>>>> To: "WISPA General List" <wireless@wispa.org> >>>>> Subject: Re: [WISPA] spectrum analysis - 5dBm interference at 5785 >>>>> >>>>> Quite likely you're right. >>>>> >>>>> I tried shutting off the trango AP's with no luck - same bad spectrum >>>>> analysis. I'm next going to go on site and do linktests on the AP's >>>>> with the backhaul off. >>>>> >>>>> My suspicion is the backhaul is bad - at least the spectrum analysis, >>>>> but it is potentially the source of interference as well. >>>>> >>>>> Randy >>>>> >>>>> >>>>> Lakeland wrote: >>>>> >>>>> >>>>> >>>>>> Randy, >>>>>> >>>>>> You cant go by that spectrum analyzer. Something is wrong. Most >>>>>> >>>>>> >>>>>> >>>> receivers >>>> >>>> >>>> >>>>>> can't handle 5dbm pumped into them without killing them. >>>>>> >>>>>> -B- >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> Randy Cosby writes: >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>>> Over the weekend we started getting complaints about a bad linktests >>>>>>> >>>>>>> >>>>>>> >>>> for >>>> >>>> >>>> >>>>>>> all customers on an old trango AP site. I've tried finding a cleaner >>>>>>> >>>>>>> >>>>>>> >>>> >>>> >>>> >>>>>>> channel, but am not having much luck getting good linktests up there. >>>>>>> >>>>>>> >>>>>>> >>>> >>>> >>>> >>>>>>> This is one of the first sites I built, and use a couple OSBridge 5Gxi >>>>>>> >>>>>>> >>>>>>> >>>> >>>> >>>> >>>>>>> radios to backhaul. I found they added a spectrum analyzer to a >>>>>>> >>>>>>> >>>>>>> >>>> newer >>>> >>>> >>>> >>>>>>> firmware version, so I installed it and ran a analysis of the site. >>>>>>> >>>>>>> >>>>>>> >>>> It >>>> >>>> >>>> >>>>>>> shows a 5dBm signal at 5785! Not -5, but 5. See attached. It >>>>>>> >>>>>>> >>>>>>> >>>> appears >>>> >>>> >>>> >>>>>>> that something VERY hot is either pointed at my AP site, or something >>>>>>> >>>>>>> >>>>>>> >>>> up >>>> >>>> >>>> >>>>>>> there has started interfering. >>>>>>> >>>>>>> Spectrum analysis from the near side of the link was relatively clean. >>>>>>> >>>>>>> >>>>>>> >>>> >>>> >>>> >>>>>>> Any suggestions on where to start my search? >>>>>>> >>>>>>> Randy >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>>> >>>>>> Bob Moldashel >>>>>> Lakeland Communications, Inc. >>>>>> 1350 Lincoln Avenue >>>>>> Holbrook, NY 11741 >>>>>> 800-479-9195 >>>>>> 631-286-8873 Fax >>>>>> 516-551-1131 Cell >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>> ---------------------------------------------------------------------------- >>>> ---- >>>> >>>> >>>> >>>>>> WISPA Wants You! 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