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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