The NS2 can be set to V-pol, H-pol or Adaptive.
Charles Wyble wrote:
The NS2 is dual polarity.
Not sure what polarity the clients are. We get a lot of Iphones/Ipods as
clients.
So I haven't done any scientific studies, but wanted to give a real
world indication of AP selection and coverage area.
Tom DeReggi wrote:
well thats interesting, but you didn't address the primary question of
polarity.
Or what polarity hotspot CPE devices generally see.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Charles Wyble" <char...@thewybles.com>
To: "WISPA General List" <wireless@wispa.org>
Sent: Thursday, April 30, 2009 2:30 PM
Subject: Re: [WISPA] WAN HotSpot and Polarity
I found that with a NanoStation2 I was able to provide coverage to an
entire strip mall. Google earth it:
229 Main Street
El Segundo, CA 90245
is where I deployed the AP.
It's a fairly standard strip mall. I covered the entire mall, plus
across the street in all 4 directions.
Tom DeReggi wrote:
Over the years, there have been many theories and strategies regarding
what
polarity is best to use for various purposes.
As an engineer, I as well have my theories. But, I wanted to get an
updated
opinion based on field trials of others, for the following
application....
Application... 2.4Ghz WAN WIFI HotSpot
Specs...
1) Average sub located within 100 yards to 1/2 mile.
2) Find and Subscribe by "Search for available Networks", via laptop's
WIFI
card.
3) If RF signal good enough to get a web splash screen to user, will
display
instruction for ordering higher gain antenna self-install kit for inside
their window mount or balcony.
4) Access Point would likely use a sector panel (60 deg?), with an EIRP
of
36db.
The goal here is.... enabling residential users to find the ISP's AP on
their own.
So my questions are....
1. If a Horizontally polarized antenna is used at the AP, Is it likely
the
consumer will equally be able to find your AP, compared to if it had been
verical pol'd?
The idea being, horizontal pol's noise floor is much lower in the
particular
area, and more likely ISP will avoid the noise from consumer APs that
ship
with vert pol antennas, where end users by default will stick the
antennas
straight up in Verticle pol position.
2. By the time the ISP's horizontal signal gets to the end user, is it
received in multiple polarities, based on all the reflections in end
users
home and stuff?
3. Are laptop wifi cards typically "no polarity", and pick up Horizontal
as
good as verticle signals?
4. Laptops would appear to have Horizontal pol antennas in some cases,
expecially if a PCMCIA card. Is this true? Or are most laptops starting
to
embed verticle pol antennas on the sides of screens?
5. Are End Users getting savy enough to move their laptop all around,
when
they first take it out of the box, to try and find Horizontal pol APs of
ISPs Hotspots?
In summary.... If doing Hotspot WAN deployment, and Verticle noise is
significantly higher, will an ISP be doing a smart thing putting their
sector on Horiz pol to avoid noise, or shooting themself in the foot
because
they'll be sending a signal cross pol to the average end user's verticle
pol's Wifi card, taking a 20db hit off the bat?
Sure.... Horizontal will be better, if the the consumer gets a
professional
install, or learns to put an external horizontal pol antenna on their
laptop
or PC. But most people may not know to do that, by default, for hotspot
self
subscription. (PS. recognize could use dual pol or 45deg off pol, but
purposely avoiding that, to try not to interfere with others, to enable
more
people to play in the same spectrum)
What have other's found?
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "George Rogato" <wi...@oregonfast.net>
To: "WISPA General List" <wireless@wispa.org>
Sent: Wednesday, April 29, 2009 8:27 PM
Subject: Re: [WISPA] RB333/433 eliminating self-interference test
Tom DeReggi wrote:
Good point but..... the problem went away when the mcpi cards each had
their own SBC/Case, this would infer card to card or pigtail to pigtail
interference, since in all cases the dummy load was outside the cases,
from what it sounds like.
I guess that should be clarified....
Kurt, when you tested with teh RB600 and 3 cards on the adjacent slots,
was the RB600 also in a case with the holes metal taped?
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
Question I have that should debunk that theory that cards in close
proximity interfere with each other. Why do the cards not interfere with
each other when there is additional gain antennas hooked on to them?
You would think there would be even more self interference with high
gain antennas than with no antennas....
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