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: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] 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: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org]
> On
>> Behalf Of Josh Luthman
>> Sent: Tuesday, March 30, 2010 9:50 PM
>> To: sarn...@info-ed.com; 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 <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
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>> 
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>>>> 
>>>> 
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>> -- 
>> Josh Luthman
>> Office: 937-552-2340
>> Direct: 937-552-2343
>> 1100 Wayne St
>> Suite 1337
>> Troy, OH 45373
>> 
>> "Success is not final, failure is not fatal: it is the courage to
>> continue that counts."
>> --- Winston Churchill
>> 
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