It's a MIMO 2x2 with Mimo 2x2

Gino A. Villarini
g...@aeronetpr.com
Aeronet Wireless Broadband Corp.
tel  787.273.4143   fax   787.273.4145

-----Original Message-----
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On
Behalf Of Chuck Hogg
Sent: Wednesday, August 19, 2009 9:59 AM
To: WISPA General List
Subject: Re: [WISPA] Bullet M5 HP

I'm not running 2 MIMO, but we are running 1 R5N MIMO and 1 XR5 link
pointing from/to the same location.  I'm able to keep them from
interfering, and would only guess that we could keep 2 MIMO's from
interfering.  There's enough 5Ghz frequency to not interfere.

Regards,
Chuck Hogg
Shelby Broadband
502-722-9292
ch...@shelbybb.com
http://www.shelbybb.com


-----Original Message-----
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On
Behalf Of Gino Villarini
Sent: Wednesday, August 19, 2009 9:52 AM
To: sc...@brevardwireless.com; WISPA General List
Subject: Re: [WISPA] Bullet M5 HP

Ever wondered why tcp troughput is so low vs udp on this mimo units?

Cross pol interference ... that's why

Try to run 2 mikrotik mimo setups on the same site.... then report back

Gino A. Villarini
g...@aeronetpr.com
Aeronet Wireless Broadband Corp.
tel  787.273.4143   fax   787.273.4145

-----Original Message-----
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On
Behalf Of Scott Carullo
Sent: Tuesday, August 18, 2009 10:51 PM
To: sc...@brevardwireless.com; WISPA General List
Subject: Re: [WISPA] Bullet M5 HP


Tom, I believe there is a huge advantage to being able to use HPOL and
VPOL 
at the same time with the same 20Mhz channel and get twice the
bandwidth.  
Its sort of like your personal gps sync within the device.
Realistically 
(for me anyway) I find that if there is strong noise on a give channel
and 
its close enough (same tower / site) than changing the polarity won't
help 
make the freq usable any way.  Therefore I argue that MIMO (2x2) allows
for 
BH use the actual more efficient use of spectrum.  I do not compare that
at 
all to the same as using two different 20Mhz chunks of spectrum and
argue 
that you can indeed get twice the bandwidth out of the same 20Mhz (or
40Mhz 
if your environment allows) spectrum.

I'm seeing it right now in my test gear or I'd be a skeptical as the 
bunch...  I like what I see so far but my testing has been somewhat 
limited.  I'll know a lot more this time next month.  I'm sure this 
discussion will do nothing but get more interesting in the near future
when 
the rubber hits the road.

Scott Carullo
Brevard Wireless
321-205-1100 x102





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