Correct, it is achieved by altering the phasing between the sections compared to a non-downtilt antenna. The sections that determine the phasing are a different length. It's a physical thing, not electronic.
Greg On Mar 31, 2010, at 8:17 AM, Mark McElvy wrote: > So its just something that is there with no adjustment? > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Greg Ihnen > Sent: Wednesday, March 31, 2010 7:45 AM > To: WISPA General List > Subject: Re: [WISPA] Ubiquiti Sector Tilt angle > > It projects a cone instead of a disc. > > Greg > > On Mar 31, 2010, at 7:56 AM, Mark McElvy wrote: > >> Ok, dumb question time. How does electrical downtilt work on an omni? >> >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] > On >> Behalf Of Josh Luthman >> Sent: Tuesday, March 30, 2010 9:50 PM >> To: [email protected]; WISPA General List >> Subject: Re: [WISPA] Ubiquiti Sector Tilt angle >> >> Electrical down tilt helps for that kind of installation. >> >> On 3/30/10, Scottie Arnett <[email protected]> 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" <[email protected]> >>> Reply-To: WISPA General List <[email protected]> >>> 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: [email protected] [mailto:[email protected]] >> 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! 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