I understand that Cisco is expensive, but it does work. I have clients with Cisco Aironet 340's installed that are 7+ years old. Is it the national pastime to beat on Cisco?
As for antennas, Superpass makes some that might work well for this project http://www.superpass.com/SP-MIMO-D1J1.html http://www.superpass.com/MIMO-24.html http://www.superpass.com/MIMO-5.html John 3-dB Networks wrote: > Right... N relies on MIMO... so antenna diversity is important. In an > indoor application this AP would have six small Omni antennas on it... just > inches apart from each other. I don't think the exact placement of the > antennas is important, as long as the patterns overlap. I've never seen > anything specifying the distances of antennas... but if someone knows that > would be great. > > Either way, a dual-band antenna would cut it from six sectors to three... > and not lose any of the benefits. Might not be cost effective, but I want > to explore that. I'd also hope that there would be an antenna out there > that already has the antenna diversity setup inside the antenna by having > three elements pointing the correct directions. I wouldn't think noise > would be that big of an issue at the antenna since they will all be > broadcasting on the same frequency anyways. > > As for what he is trying to accomplish... I wish I knew. His application > does not require 802.11n speeds, it could require the MIMO near and non-los > properties... I think he wants 802.11n because it's the next thing. Just > like I don't think he should be using Cisco... but no IT guy has ever been > fired for deploying Cisco right :-) > > Daniel White > 3-dB Networks > http://www.3dbnetworks.com > > > >> -----Original Message----- >> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >> Behalf Of Marlon K. Schafer >> Sent: Tuesday, February 24, 2009 8:34 AM >> To: WISPA General List >> Subject: Re: [WISPA] Dual-band Sector Antennas/Multiple Input Sector >> Antennas >> >> I think the whole idea behind N is antenna diversity Daniel. >> >> Using less antennas means he'll get little or no benefit from the >> system. >> Might as well just run with a standard b/g system. >> >> I think antenna placement will also be critical for n. I could be >> totally >> wrong here, but my guess is that there are specific distances between >> antennas that are part of the magic of n. >> >> What's he hoping to accomplish? >> >> Better NLOS, better nLOS, better speed? >> >> laters, >> marlon >> >> ----- Original Message ----- >> From: "3-dB Networks" <wi...@3-db.net> >> To: "'WISPA General List'" <wireless@wispa.org> >> Sent: Tuesday, February 24, 2009 6:43 AM >> Subject: [WISPA] Dual-band Sector Antennas/Multiple Input Sector >> Antennas >> >> >> >>> I'm helping someone design an antenna system to utilize the MIMO >>> properties >>> in 802.11n outdoors. The Cisco box he wants to connect to has three >>> >> 5GHz >> >>> and three 2.4GHz outputs. I'd rather avoid deploying six sector >>> >> antennas >> >>> (only need to cover about 120 degrees. so I figured three 90degree >>> >> sectors >> >>> ought to do it) so would like recommendations on : >>> >>> >>> >>> - Good dual-band 2.4GHz/5GHz antenna >>> >>> - Good Sector antenna that has multiple inputs on the same >>> >> band, >> >>> same polarity (not sure if such a beast exists, but doesn't hurt >>> >> asking!). >> >>> >>> V-pol is preferred, as the clients will have V-pol omnis. >>> >>> >>> >>> Any help is really appreciated. Thanks! >>> >>> >>> >>> Daniel White >>> >>> 3-dB Networks >>> >>> http://www.3dbnetworks.com >>> >>> >>> >>> >>> >>> ---------------------------------------------------------------------- >>> >> ---------- >> >>> WISPA Wants You! 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