What are you seeing with the slim elevation radiation pattern? ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com
On 8/11/2010 12:19 AM, Robert West wrote: > Working fine for me as well. Depending on the terrain, we use the smaller > sectors as well as the larger ones. Small sectors going 6+ miles in flat > open ground, larger ones are going 12+. With some trees. > > Bob- > > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of Faisal Imtiaz > Sent: Tuesday, August 10, 2010 7:45 PM > To: WISPA General List > Subject: Re: [WISPA] Ubiquiti antenna testing yet? > > Hi Tom, > Call me naive...not quiet sure what you are asking. specifically... > > We have a number of the smaller Ubiquiti Sectors in use.... Prior to your > email it never occurred to me that I have to worry about cross pol rejection > with MIMO antennas... But on the other hand I am also not trying to put > 10miles link using those antennas.... > > All I can say they work perfectly fine.. > :) > > Regards. > > Faisal Imtiaz > Snappy Internet& Telecom > 7266 SW 48 Street > Miami, Fl 33155 > Tel: 305 663 5518 x 232 > Helpdesk: 305 663 5518 option 2 Email: supp...@snappydsl.net > > > On 8/10/2010 7:32 PM, Tom DeReggi wrote: >> The Ubiquiti dual pol antennas have been around for a while now. >> Has anyone gained any real world testing results regarding difference >> in performance for MIMO based on which antenna used. >> >> The two Ubiquiti sector types 16/17db versus 19/20db models have >> signficantly different specs on Cross pol rejection. >> As well, NanoStation makes a good 45 deg sector, at 14db, (14dbi + >> 22dbm = Max EIRP 36db for PTMP) with a bit less cross pol rejection than > the others. >>> From past experience, in any MIMO product in general, using PTP, >>> I've >> observed that maximizing the Cross pol isolation is very advantageous >> to gain a highest performing links. >> (so pols dont interfere with each other at high modulations). In >> general, I'd get numbers like anything less than 35db isolation would >> result in quality loss. >> BUT... I've never tested with Ubiquiti yet. >> >> So my question here is.... Have people been successful using the >> smaller 16/17db Sector antennas successfully with MIMO? >> >> I can do the math and RF engineering, and I can predict that the >> larger >> 19/20 db antenna's have much better cross pol rejection, and combined >> with the third party shield made for them, to increase Front to Back >> ratio signficantly, they are an ideal choice for serious cell site > deployments. >> But, for less critical smaller area deployments, I can see the >> adantage of using the smaller antennas to save space vertically. >> So just wondering what experience others are having with the 16/17db >> Ubiquiti Sectors. To be clear, the "gain" of the antenna is NOT my >> concern here. I interested in whether the Cross Pol rejection is good >> enough on shorter sector antenna to gain good MIMO quality. >> >> Note: short antenna speced at 22db cross pol isolation, whereas taller >> antenna speced at 28db cross pol. >> >> Tom DeReggi >> RapidDSL& Wireless, Inc >> IntAirNet- Fixed Wireless Broadband >> >> >> ----- Original Message ----- >> From: "Butch Evans"<but...@butchevans.com> >> To: "WISPA General List"<wireless@wispa.org> >> Sent: Tuesday, August 10, 2010 6:11 PM >> Subject: Re: [WISPA] RB1100 >> >> >> >>> On Tue, 2010-08-10 at 16:48 -0400, Chuck Hogg wrote: >>> >>>> It's the same. All these distributors "NAME" their gear as their >>>> own devices. One distributor will support you without the added >>>> fees, and the other will charge you the fees. It's cheaper at Titan. >>>> When I owned QuickLink Wireless, it was these types of things that >>>> separated us from other distributors; how the customer was supported. >>>> >>> This is exactly the point I was making. Titan is a great company to >>> work with (this is from my own experience). My company is good to >>> work with as well, though I didn't mention that. There are several >>> companies out there that sell this (and other) hardware. The only >>> difference is the company you end up dealing with. For some, Dennis >>> is their choice..there is NO "secret sauce" in the routers themselves. >>> >>> -- >>> ******************************************************************** >>> * Butch Evans * Professional Network Consultation* >>> * http://www.butchevans.com/ * Network Engineering * >>> * http://store.wispgear.net/ * Wired or Wireless Networks * >>> * http://blog.butchevans.com/ * ImageStream, Mikrotik and MORE! * >>> ******************************************************************** >>> >>> >>> >>> --------------------------------------------------------------------- >>> ----------- >>> 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/ > > > > -------------------------------------------------------------------------------- > 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/
