Well Said. Faisal
Snappy Internet& Telecom On 8/11/2010 12:22 PM, Jerry Richardson wrote: > There is a tendency among installers to assume that if they are close they > can get away with less antenna. If they understand the relationship between > gain and pattern they will be less likely to make this mistake. > > Sometimes we can be 1 mile from the antenna but since it's 3500' up we are > looking at the bottom of the lobe and consequently the available gain from > the 17dB antenna is closer to 6dB. > > - Jerry > > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of Faisal Imtiaz > Sent: Wednesday, August 11, 2010 9:09 AM > To: WISPA General List > Subject: Re: [WISPA] Ubiquiti antenna testing yet? > > .....If you do the calculations, you may be surprised as to how much > coverage you can get with the narrow beam width... (it is function of AP > height as well)... > > The only time you run into a problem, is when you are trying to do a > 1/4mile or 1/2 mile link and 10mile link off the same panel....but then > again, doing something like such also has other issues associated with it.. > > Since the radios are in-expensive....... do the 1/4 mile / 1/2mile or > even 1 mile link with something like a Nanobridge (10" dish)... and > leave the panel along for the longer links. > > 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 8/11/2010 12:02 PM, Mike Hammett wrote: > >> Yeah, yeah, same thing. >> >> So you're not seeing coverage issues with the narrow vertical beam width >> of the higher gain antenna? I'd think something that narrow to be >> difficult to do short and long links. >> >> ----- >> Mike Hammett >> Intelligent Computing Solutions >> http://www.ics-il.com >> >> >> >> On 8/11/2010 10:47 AM, Faisal Imtiaz wrote: >> >> >>> Do you mean the "narrow vertical beam width" ? >>> If you do the calcs, you will see that it is actually good to have this... >>> >>> With electrical down tilt built in.... most of the time the antenna is >>> getting mounted 'flush'..... in our case at lower heights we are doing >>> an up-tilt.... >>> It also allows you to 'reduce' your coverage area, but using additional >>> down tilt... >>> >>> in-other words.... it has not been a show stopper. >>> >>> Actually, the small antenna size has been extremely well received by >>> building owners... who are concerned about the aesthetics of a large >>> antenna on top of their roof or side of the bldg. >>> >>> Faisal Imtiaz >>> Snappy Internet& Telecom >>> >>> >>> On 8/11/2010 10:50 AM, Mike Hammett wrote: >>> >>> >>>> 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! 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