Electrical down tilt helps for that kind of installation. On 3/30/10, Scottie Arnett <sarn...@info-ed.com> wrote: > As a rule of thumb, as the dB gets higher(or smaller in negative speak) in > an antenna, the beam width of the opposing polarity of the antenna gets > smaller, and thus harder to work with. > > As an example, I have used 15dB Omni's in 2.4Ghz(I'll leave the brand > unannounced). I first put them about 60 feet in the air and found that I > could not get a good usable signal unless I was about 2 miles or so from the > tower. I dropped them to 20 - 25 feet and picked up clients within .25 miles > out to a couple of miles. The horizontal beam width on the Omni was so > small, I was way overshooting my intended target. > > Lesson learned was to always look at both vert and horiz beam width, and > lesson learned on the 15dB Omni is to only use in trailer parks, very small > subdivisions, and RV parks... and ... to not mount it above 30 feet high. > > Scottie > > ---------- Original Message ---------------------------------- > From: "Robert West" <robert.w...@just-micro.com> > Reply-To: WISPA General List <wireless@wispa.org> > Date: Mon, 29 Mar 2010 18:41:21 -0400 > >>Well, I've been setting up a service contract with my friends on planet >>Wispalon so I need to find the proper tilt angle to beam the signal into >>space. :) >> >>Yeah, I've been mindful to stay off the horizon, seems wasteful in a big >>way. I'm not a trig scholar so I use basic tilt angle calculators which >>have never failed me but these things have me upside down. Tower height, >>distance desired and all are good to have but I was really interested in >>others experiences with them and how they have been able to get their >>angles. Again, the smaller, lower gain sectors have been right on the >> money >>but I wasn't aware (ignorant) that these high gain units would give me a >>smaller slice to work with. On the advice of another member I have been >>trying one AP with 4 120 degree 19dbi sectors used as 90's. Signal is >> great >>where we can see it, just needed a good fix for not having to do the 2 man >>show all over the county. (With everyone in a pickup truck stopping to ask >>why we're by the road with an antenna) >> >>Bob- >> >> >>-----Original Message----- >>From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >>Behalf Of Lawrence E. Bakst >>Sent: Monday, March 29, 2010 5:50 PM >>To: WISPA General List >>Subject: Re: [WISPA] Ubiquiti Sector Tilt angle >> >>Technically speaking you're wrong. The highest gain area of a sector >> antenna >>is the center point between the horizontal and vertical spreads. If you >>don't downtilt you are sending the strongest part of the signal parallel to >>the horizon. Why would you ever want to do that? The whole reason you >>downtilt is to get the strongest signal pointed to the area you want. >> >>Figuring this out takes some basic trig calcs using the tangent function. >> >>No one has asked the most important questions you need to know when >>calculating downtilt: >> >>1. How high up is the sector antenna? >> >>2. How far out or in what range near to far do you want the sweet spot? >> >>3. How close in to the tower do you need service? >> >>#2 and #3 can conflict with each other and you may have to make a tradeoff. >> >>leb >> >>At 2:22 PM -0400 3/29/10, Faisal Imtiaz wrote: >>>..... Technically speaking.. if you are not concerned about dealing with >>>'near' customers.... less than 1 or 2 miles... then you can pretty much >>>leave the sectors at '0' tilt.. and you have coverage to the horizon.... >>> >>>The built-in electrical down-tilt typically throws folks off...... only >>>becomes a factor if you are needing to down tilt for near customers.. >>> >>>Faisal. >>> >>>On 3/29/2010 1:36 PM, Robert West wrote: >>>> I'm having a heck of a time with the large UBNT sectors getting the tilt >>>> angle to jive. With the smaller sectors, they behave perfectly and go >>right >>>> where the calculations say they will however, with the larger ones, >>nothing >>>> I do other than have someone 10 miles out with a CPE check levels while >>>> I >>>> tilt up and down seems to be good. I REALLY don't want to have to do >>that >>>> with all of them... >>>> >>>> >>>> >>>> Anyone having any success or insight with the proper tilt of these >>things? >>>> Using the 120 degree 5GHz flavors. >>>> >>>> >>>> >>>> Thanks! >>>> >>>> >>>> >>>> Robert West >>>> >>>> Just Micro Digital Services Inc. >>>> >>>> 740-335-7020 >>>> >>>> >>>> >>>> Logo5 >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>---------------------------------------------------------------------------- >>---- >>>> 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! 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