Yep, that's it. There you go.
On 12/4/2015 3:25 PM, Faisal Imtiaz wrote:
Since inquiring minds want to know...
Here is the Word on this topic from Cambium... (While this was titled
2.4Ghz, as per them, it applies to their 5ghz as well).
:)
Faisal Imtiaz
Snappy Internet & Telecom
7266 SW 48 Street
Miami, FL 33155
Tel: 305 663 5518 x 232
Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net
------------------------------------------------------------------------
*From: *"Joshaven Mailing Lists" <lis...@joshaven.com>
*To: *af@afmug.com
*Sent: *Friday, December 4, 2015 4:15:55 PM
*Subject: *Re: [AFMUG] to slant, or not to slant - that is the
question
The Atheros chipset differentiating between the Mimo chains does
not have to do with 45º slant vs 90º… it means that chain A and B
on one radio can be H&V or V&H while chain A and B on the other
can be H&V or V&H interchangeably with no loss because and the
chip will just cross them over as needed. This means that hooking
up the antenna cables “backwards” won’t effect anything. It
doesn’t mean that the orientation of the antenna is irrelevant.
The energy received by an antenna that is out of phase with
another antenna is much less then if it was in phase that is a
principal of radio that no chipset will ever overcome. Now… maybe
you can make a magic antenna that is “multi phased” such that it
can tune in a 45º phase offset signal well. I suspect that the
Cambium equipment when properly matched will both have the same
polorization.
I believe that if your having the same outcome on slant or not
slant it would be due to one chain being refracted. For example
if your horizontal chain was fine but the virtual chain was
refracted off something such that the wave was on or near a 45º
slant then you would have the same basic performance regardless of
a standard or slant orientation. This however is a path issue not
a design characteristic of the chipset or antenna.
FYI, linearly polarization is not a reference to the polarization
being on a vertical, horizontal or slant axis but a reference to
the way the wave propagates, circular polarization is an
alternative to linear polarization not “slant".
Sincerely,
Joshaven Potter
MTCNA, MTCRE, MTCWE, MTCTCE, UACA
Google Hangouts: yourt...@gmail.com <mailto:yourt...@gmail.com>
Cell & SMS: 1-517-607-9370
supp...@joshaven.com <mailto:supp...@joshaven.com>
On Dec 4, 2015, at 2:13 PM, Adam Moffett <dmmoff...@gmail.com
<mailto:dmmoff...@gmail.com>> wrote:
The DSP in the ePMP can do some kind of processing to correct
for the 45 degree offset when you have slant on one end and
V+H on the other. I might not be stating it with the correct
technical jargon, but that's the gist of it. They sell a dual
slant sector for the AP with the intent to use it with V+H
integrated SM.
This is a built in feature of the Atheros chipset, so
presumably UBNT radios can do the same thing.
That all said...I would try to match them up as just a matter
of principle.
On 12/4/2015 2:07 PM, Joshaven Mailing Lists wrote:
Your AP & SM should always have the same antenna
orientation. I promise you that you don’t want slant on
the AP and not on the CPE. If the signal is so obstructed
that the orientation is screwed up to the point that
unmatched polarization is actually a benefit then there is
something seriously wrong…
Sincerely,
Joshaven Potter
MTCNA, MTCRE, MTCWE, MTCTCE, UACA
Google Hangouts: yourt...@gmail.com
<mailto:yourt...@gmail.com>
Cell & SMS: 1-517-607-9370
supp...@joshaven.com <mailto:supp...@joshaven.com>
On Dec 4, 2015, at 1:59 PM, Paul McCall
<pa...@pdmnet.net> wrote:
We are looking at smaller sector sizes for a 5 Ghz
ePMP cluster (60 degree probably), and am considering
my options, which might also increase my gain quite a
bit. Using a non-Dual Slant sector such as
AM-5AC21-60, would increase my options. There have
been a calling threads on Cambium’s sites about
whether Dual Slant was a big factor at the AP if the
SMs aren’t dual-slant.
Cambium’s Daniel Sullivan made this comment … The
thread was originally about 2.4 Ghz options, so not
sure if it applies exactly to 5 Ghz.
Paul
