You can't check with a spectrum anylyzer at the base! You have to climp the tower and plug each antenna in to the spectrum anyalyzer.
Also there is no "black magic" involved. Wireless can all be explained with laws of physics. There are too many wireless providers out there that just "plug and pray." Most of them just get lucky and the stuff "just works." They can't even explain why it works. You need to go down this list and check everything: 1. Test all radio's, pigtails, coax with a power meter. 2. Check SWR on all the antennas. 3. If you have a spectrum analyzer, consider yourself lucky and check each sector at the antenna port. 4. Who made the coax jumpers? Make sure center pin is flat against edge of connector. I've seen N connectors not work at 2.4ghz but work at 5.8ghz due to this. Kurt Fankhauser WAVELINC P.O. Box 126 Bucyrus, OH 44820 419-562-6405 www.wavelinc.com -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Michael Baird Sent: Thursday, June 18, 2009 10:22 AM To: WISPA General List Subject: Re: [WISPA] Radio Seperation At the base, I see no signals except from my radios, with the spectrum analyzer. I've still not been able to get the guy to climb the tower, in other forum's I've found people with horizontal antennas, having a problem on RX at the AP only with too much downtilt. Near the tower there are a few apartment complexes and hotels that are in the focus of the main beam at that downtilt. When I get the guy up on the tower, I am going to try uptilting it first for sure, maybe with that tilt they are picking up more noise then they should be. Regards Michael Baird > It sure seems like interference since it's on all three APs, even when > you turn off the other two. One bad radio is possible but not three. > > Could there be some others source of interference near but not on the > tower? > > Greg > On Jun 16, 2009, at 10:13 AM, Michael Baird wrote: > > >> The only other things on the tower according to the owner, is at >> 150mhz >> and 450 mhz. >> >> Regards >> Michael Baird >> >>> Could there be any other source of interference? What else is on the >>> tower? >>> >>> Greg >>> >>> On Jun 16, 2009, at 8:37 AM, Michael Baird wrote: >>> >>> >>> >>>> I actually shut the radio's off on the two opposite sectors and >>>> didn't >>>> see improvement, tried that with all three sectors, they all read >>>> about >>>> the same. >>>> >>>> From the suggestions here and elsewhere, I'm going to do the >>>> following >>>> one at a time. >>>> >>>> 1). Spectrum analyze with all the radios off. >>>> >>>> 2). Adjust the downtilt first, I have a client setup, I'll adjust >>>> the >>>> downtilt on their sector from 7.8 to 4 degrees and see what happens, >>>> if >>>> that helps I'll go to 0.3 and look at the settings, which will align >>>> the >>>> main beam to 5 miles out, and try to catch everybody underneath, I >>>> have >>>> seen confirmation that downtilt can affect just the AP side. >>>> >>>> 3). Remove the LP and see if that makes any difference, our inhouse >>>> testing doesn't show any impact though. >>>> >>>> 4). Separate the radios by 10 feet vertically, I will do this >>>> anyway, >>>> although turning off the other sectors should have taken this out of >>>> the >>>> equation, unless the other two sectors are reflecting on each other >>>> badly, because of their close proximity. >>>> >>>> 5). Change out a radio, and see if somehow all of my radio's got >>>> fried. >>>> >>>> Regards >>>> Michael Baird >>>> >>>> >>>>> Michael >>>>> >>>>> If you can reduce the TX power on 2 of the sectors and see if the >>>>> third has RSL improvement >>>>> >>>>> Bob >>>>> Sent from my Verizon Wireless BlackBerry >>>>> >>>>> -----Original Message----- >>>>> From: Blair Davis <the...@wmwisp.net> >>>>> >>>>> Date: Mon, 15 Jun 2009 22:44:52 >>>>> To: WISPA General List<wireless@wispa.org> >>>>> Subject: Re: [WISPA] Radio Seperation >>>>> >>>>> >>>>> >>>>> >>>>> ---------------------------------------------------------------------------- ---- >>>>> WISPA Wants You! 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