In my limited experience taking apart antennas, most dual-polarized non-dish
antennas use an array of patches fed at perpendicular angles to save space,
which I believe have limitations in beamwidth going much past 90/120 deg. It's
very visible in dual slant omnis which are often 4 arrays of ~90deg dual-slant
patches wired together which results in the "cloverloaf" pattern.
You may have an easier time finding seperate Hpol 180deg and Vpol 180deg
antennas.
-----Original Message-----
From: Bill Prince <part15...@gmail.com>
Sender: "Af" <af-boun...@afmug.com>
Date: Wed, 18 Feb 2015 00:50:33
To: <af@afmug.com>
Reply-To: af@afmug.com
Subject: Re: [AFMUG]
Decent "true" DP 120° sector in 5 GHz
This site is not ABAB. It's not even AB. It is merely A. One sector;
120° wide, with about 15 subs. About as low as you can go. The problem
is that most of the subs are near the outer edges of a 120° sector.
Dividing it into 2 sectors would be an option if we had (or expected)
more subs, but this one I don't think that will happen. I'm not inclined
to burn a Canopy AP (or two even) on 7 or 8 subs each.
bp
<part15sbs{at}gmail{dot}com>
On 2/17/2015 12:13 PM, Ken Hohhof wrote:
> I think asking for 3 dB down at 120 degrees in dual pol with matching
> patterns, good F/B and good sidelobes is not going to happen. I’d plan
> on ABAB and look for a 90 degree sector.
> Hmmmm, the published patterns for the KPP “Gen III” are kind of ugly,
> aren’t they? Plus the HPOL and VPOL azimuth patterns don’t match very
> well.
> *From:* Mathew Howard <mailto:mhoward...@gmail.com>
> *Sent:* Tuesday, February 17, 2015 2:05 PM
> *To:* af <mailto:af@afmug.com>
> *Subject:* Re: [AFMUG]Decent "true" DP 120° sector in 5 GHz
> I thought the KP sectors were suppose to be -3db at 120... I think
> almost everything is rated at -6db now.
> On Tue, Feb 17, 2015 at 1:26 PM, Adam Moffett <dmmoff...@gmail.com
> <mailto:dmmoff...@gmail.com>> wrote:
>
> The new 120 is the old 90....search for something advertised as
> wider than 120 I guess?
>> What I'm looking for is a 120° sector that drops off no more than
>> 3db at the edges. The 6 db bull that seems to be common these
>> days is not what I'm looking for.
>>
>> Also want good F/B ratio, good cross-pol performance, and tiny
>> side lobes. In perfect world, it would drop off 30db at 121°.
>>
>> I want a pony too.
>>
>> bp
>> <part15sbs{at}gmail{dot}com>
>> On 2/17/2015 10:50 AM, Josh Luthman wrote:
>>> Good drop off is a good thing IMO.
>>> If you want less drop off probably go with an original Airmax
>>> sector. Those things bleed for days and the f/b isn't very
>>> good. We installed half a dozen people 180* off one of them.
>>> Josh Luthman
>>> Office: 937-552-2340 <tel:937-552-2340>
>>> Direct: 937-552-2343 <tel:937-552-2343>
>>> 1100 Wayne St
>>> Suite 1337
>>> Troy, OH 45373
>>> On Tue, Feb 17, 2015 at 1:45 PM, Bill Prince
>>> <part15...@gmail.com <mailto:part15...@gmail.com>> wrote:
>>>
>>> No one?
>>>
>>> bp
>>> <part15sbs{at}gmail{dot}com>
>>>
>>> On 2/17/2015 9:55 AM, Bill Prince wrote:
>>>
>>>
>>> Has anyone found a decent TRUE 120° dual-polarity
>>> sector in 5 GHz? We're using a KP on one of our
>>> POPs and the drop-off at the edge of the 120° is
>>> just too much for our taste.
>>>
>>>
>>>
>>
>
