With -20s Im guessing that at the edges of each of the 20mhz channels that they are bleeding over into the next non-overlapping channels at about -50 or -60. Thats just a guess as I have never seen a spectrum anylazyer of a 2.4ghz signal. Im sure someone here has though.
If you dont want to move the antennas you could put some band pass filters in line for each channel 1,6,11. http://www.streakwave.com/Itemdesc.asp?ic=24BPFX-8-CH1 <http://www.streakwave.com/Itemdesc.asp?ic=24BPFX-8-CH1&eq=&Tp> &eq=&Tp= http://www.streakwave.com/Itemdesc.asp?ic=24BPFX-8-CH6 <http://www.streakwave.com/Itemdesc.asp?ic=24BPFX-8-CH6&eq=&Tp> &eq=&Tp= http://www.streakwave.com/Itemdesc.asp?ic=24BPFX-8-CH11 <http://www.streakwave.com/Itemdesc.asp?ic=24BPFX-8-CH11&eq=&Tp> &eq=&Tp= But thats not really a solution because then you cant change channels without changing the filters around. Kurt Fankhauser WAVELINC P.O. Box 126 Bucyrus, OH 44820 419-562-6405 www.wavelinc.com _____ From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Blair Davis Sent: Monday, June 15, 2009 10:45 PM To: WISPA General List Subject: Re: [WISPA] Radio Seperation -20/-25 seems really hot... I've seen - 35 to -40 on my own sectorized setups, but nothing that hot. And when I've been that hot, it is almost always reflections... fixed by rotating the antennas a bit around the tower to move the pattern split. I'd try removing the arrestors next... I've always used the gas tube units. Can't say much about the 1/4 wave units. Michael Baird wrote: Blair Davis wrote: To be sure about co-channel interference, shut down 2 of the 3 AP's and test on the other one. Make sure to shut them all down, then bring up just the one to test... Did that, made no difference. Down tilt should affect Tx and Rx about the same. That's what I figured as well. But you have more loss on the Rx than the Tx. Are the arrestors polarized? i.e. marked with antenna and transmitter ends? If so, are they in right? Nope, they are bi-directional, RFLinx Quarter wave. Bypass the arresters, and see what happens. Or, remove the gas tubes and see if that changes things. Haven't done that yet, they don't have gas tubes, they are quarterwave. Have you gone out and eyeballed the setup with some binoculars? Maybe the installer did something stupid that you might notice? They look fine from beneath the tower. When I've had massive imbalance Tx/Rx, it has always been either a bad card or water. Yea, they've been up on the tower for a week, it would be depressing if they are messed up that quickly. They were all pretty hot to each other -20/-25 even, but on 1/6/11, It may be possible the receivers were overloaded I suppose. I've had these radio's up on other towers for months without a problem though. Not this close together, they are about 2-3 feet apart on the same horizontal plane. The tape job, and self-vulcanizing stuff these guys put on was pretty serious stuff, I think there is zero chance of water anywhere. Regards Michael Baird Michael Baird wrote: Gino, wisp-router.com, would the downtilt affect the AP RSSI level? Antenna Height ft Downtilt Angle ° Vertical Beamwidth ° Results Inner -3dB Radius 0.1 Miles Sweet spot 0.2 Miles Outer -3dB Radius 5.24 Miles I told him 7.8, but I'm sure he didn't get dead on, just the best he could with his inclinometer. Regards Michael Baird Where are you running the calcs? I use http://www.wirelessconnections.net/calcs/AntDowntiltCalc.as With your input, I get main lobe 0.2 miles / -3db @ 7 Gino A. Villarini g...@aeronetpr.com Aeronet Wireless Broadband Corp. tel 787.273.4143 fax 787.273.4145 -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Michael Baird Sent: Monday, June 15, 2009 1:51 PM To: WISPA General List Subject: Re: [WISPA] Radio Seperation Gino, 145', 15 degree VB, 7.7/7.8 puts my -3d at ~5 miles. If my downtilt was wrong, I would think it would impact the receive on my CPE's, much more then on the tower AP's, maybe that's a poor assumption on my part though. Regards Michael Baird I think your downtilt is too much, whats your area and tower height? The beamwidth of the maxrad sector? Gino A. Villarini g...@aeronetpr.com Aeronet Wireless Broadband Corp. tel 787.273.4143 fax 787.273.4145 -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Michael Baird Sent: Monday, June 15, 2009 1:29 PM To: WISPA General List Subject: Re: [WISPA] Radio Seperation My sector's are Maxrad adjustable sector's horizontally polarized, adjusted to 120/13db, at 7.7 - 7.8 downtilt, trying to cover a 5 mile radius. Radios, are Ubiquity 400mw radio's, I've turned down to 23/200mw. CPE's, are Ubiquity PS2, same radio at 400mw, Horizontal antenna at 18 dbi. RSSI at the CPE is great, RSSI at the AP is poor often different by 16-20 db. I also mentioned the RFLinx Qwave lightning arrestors, this is the first tower we've used them on. Regards Michael Baird I don't think that this would be an antenna location issue. What antennas did you use and where are they pointed? Also, what output are the radios? If you use 600mw radios on the ap side and 100 mw radios on the rx side it'll make a difference. Also, having LOW power at the tx is almost always a good idea, especially when colocated like this. I usually only run 15 to 17dB at the ap's. Most of my sectors are 13dB. Yeah, I have customers at 18 miles with multi meg RELIABLE service this way. There are other customers at much shorter ranges that don't get reliable service, but that's caused by other issues :-). We run most of our cpe at pretty high power these days due to the need to blow through the overpowered competition or just over all noise levels. Anyway, what gain are the antennas and where are they pointed? How much downtilt etc. How far are the customers from the tower? What polarity are the antennas? All the same, or did you mix it up? What are the cpe radios? What power, what antennas etc. If you had a 15 db transmit antenna and a 15 db transmit radio shooting to a 15 dB panel at 5 miles you should see an rssi of, -83 or so. Legally you could have 6 more dB at the AP side giving you around -77 at the cpe 5 miles out. Hope this helps! marlon ----- Original Message ----- From: <mailto:m...@tc3net.com> <m...@tc3net.com> To: <mailto:wireless@wispa.org> <wireless@wispa.org> Sent: Saturday, June 13, 2009 1:09 PM Subject: [WISPA] Radio Seperation We've just installed a 3 sector 2.4 setup, at 145' with maxrad 120's. I'm noticing the receive sensitivity on the AP's are about 15-20 db's different then what I see on the CPE's, tried a Tranzeo/Ubiquity radio. I'm using Ubiquity AP's, and they work fine on another 3 sector setup I have, however this tower is an A-Frame. The tower owner won't allow outside climbers so his guy did it, and he put one on each leg at 145' back to back. If the radios were too close together even on different channels, would the RX performance on the AP exhibit this behavior? Only other change on this tower was RFLinx Quarter-wave arrestors in line. If I'm 3-5 miles away I can see on the CPE a RSSI of -65 to -75 for example, on the AP the reading would be in the -90 to not even below the noise floor. Any thoughts would be appreciated as always. Regards Michael Baird -------------------------------------------------------------------- - ----------- 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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