No because... they may not all get used for Transmit and Receive.
technically, for a well designed product using some sort of time space delay as the mechanism for seperation, having pol diversity is not necessarilly required, as polarity is not the technique to acheive seperation. It also is relevent to whether the goal is to have each antenna have the same data to improve RSSI or different data to increase speed, as if it was the same data, it would be fine to transmit all at once. I do not know how Proxim is using Pols. I'll also mention, regarding receive, there is a benefit to receiving on all three with spatial diversity. Slant is only 1.5db of seperation from each of teh otehr two pols. (45 degree off pol only yeilds 1.5db loss) If one side transmits on both H and V, the other side would use multiple RX antennas as mechanism to hear more reflection to combine into the signal for better gain, and the Slant would hear both the Vert and Hor pols. So if the Verticle got killed by multipath or some other RF barrier, and Horizontal made it through, the Horizontal and Slant antennas would both optimally hear the Horizontal singal within 1.5 DB, and be combined to assist gain. I do not know that this method is the best use of 3x3, but it is one possible use of 3 poles. . Tom DeReggi RapidDSL & Wireless, Inc IntAirNet- Fixed Wireless Broadband ----- Original Message ----- From: "Gino Villarini" <g...@aeronetpr.com> To: "WISPA General List" <wireless@wispa.org> Cc: "WISPA General List" <wireless@wispa.org> Sent: Tuesday, April 27, 2010 5:36 PM Subject: Re: [WISPA] Proxim QB 8150 > They have 3 pol antennas available > > Dual slant and vertical > > Sent from my Motorola Startac... > > > On Apr 27, 2010, at 5:35 PM, "Josh Luthman" > <j...@imaginenetworksllc.com> wrote: > >> It's a backup. >> >> On 4/27/10, Greg Ihnen <os10ru...@gmail.com> wrote: >>> On 2x2 MIMO they use V and H polarization. How do they do 3x3? >>> What's the >>> third polarization? >>> >>> Greg >>> >>> On Apr 27, 2010, at 4:08 PM, Cameron Kilton wrote: >>> >>>> They just called me and made me aware that they just received >>>> their FCC >>>> cert in 5.3 and 5.4 bands. >>>> >>>> They have a 3x3 MIMO PTP product. I'll probably get a test pair to >>>> play >>>> with. >>>> >>>> The bigger news, does this mean the FCC is going to start craking >>>> out >>>> the certs again.... yippy! >>>> >>>> >>>> -- >>>> >>>> Thanks, >>>> Cameron Kilton >>>> >>>> >>>> --- >>>> --- >>>> --- >>>> --- >>>> -------------------------------------------------------------------- >>>> 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! 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/ >>> >> >> >> -- >> Josh Luthman >> Office: 937-552-2340 >> Direct: 937-552-2343 >> 1100 Wayne St >> Suite 1337 >> Troy, OH 45373 >> >> “Success is not final, failure is not fatal: it is the courage to >> continue that counts.” >> --- Winston Churchill >> >> >> --- >> --- >> --- >> --- >> -------------------------------------------------------------------- >> 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! 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! 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/
