The good thing about this band is that free space loss is your best friend with regards to interference. Any use in this band to get an appreciable amount of signal requires very narrow beamwidth antennas to keep the power levels up to a point to overcome the attenuation through space. Couple those tighter patterns with the fact that the signal falls off very rapidly in free space and you have a greatly reduced opportunity for interference. I do agree with you on the channel width that many people will waste capacity only because they can.....
Thank You, Brian Webster www.wirelessmapping.com www.Broadband-Mapping.com -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Tom DeReggi Sent: Tuesday, March 27, 2012 12:06 PM To: WISPA General List Subject: Re: [WISPA] UBNT AirFiber Radio Pics Any way you look at it, the UBNT 24Ghz product is a game changer. Its bringing a price point, that will mass excellerate the adoption of 24Ghz use. At that price, there are 1000s of uses. Its very exciting. Its also a big bonus that it is MIMO, which should give it a good link budget, compared to the methods other technologies use to accommodate dual pol. What I dont like about it is that it uses to much spectrum and is to fast, which will cause parties to deploy faster speeds than they need, simply because they can, and cause more interference in urban areas, and reduce the number of links in an area. Often people incorrectly think that millimeter is like inteference free. What they forget is the low range is based on Rain fade, but when its not raining the signal goes very far, and reflections can reflect all over the place, even though narrow beamwidth. But there will still be a strong market for other products like SAF. For example, windloading and mounting. I jsut bought a SAF radio for that reason, where the 1ft dish option was preferred. SAF also has 256QAM support, quite a bit more efficient than UBNT's 64QAM limit, allowing high speed in smaller channels, allowing more radios to be colocated at a single site. I think UBNT's marketing is their typical overstated marketing.. Just like AIRMAX 5.8 where they promote as 300mb, when in reallity Dual Pol 20Mhz channels, the common size that can be used, yields more like between 40mb and 80mb depending on link budget and noise floor. So in doing apples to apples comparisons, its important to take that into consideration. For example, a 13mile link just isn't going to happen in my rain zone, but might be doable in the desert. With 2ft dishes, I dare not go over 2-1/4 miles, and still prefer under 1.5m. I believe the UBNT 24 product will also put a hurting on the 60Ghz market. Tom DeReggi RapidDSL & Wireless, Inc IntAirNet- Fixed Wireless Broadband _______________________________________________ Wireless mailing list Wireless@wispa.org http://lists.wispa.org/mailman/listinfo/wireless _______________________________________________ Wireless mailing list Wireless@wispa.org http://lists.wispa.org/mailman/listinfo/wireless
