Why not use the same essid on all your towers? That works for me.
Or use MikroTik AP's with a secondary essid that is the same on every
tower just for roaming users.
Marlon K. Schafer (509) 982-2181 wrote:
As an FYI, we've had wifi in cop cars since 2002. They get 15 MILES
and can roam from tower to tower as well.
http://www.odessaoffice.com/wireless/mobile.htm
We used to just use the essid of ANY and they'd tie into any of my
towers that they could see. That no longer works due to all of the
local wlans out there. As soon as someone FINALLY builds me a smart
cpe that can be told to associate with a list of 3 dozen or so ap's
this mobile wifi stuff is really gonna take off for applications like
this!
Laters,
Marlon
(509) 982-2181 Equipment sales
(408) 907-6910 (Vonage) Consulting services
42846865 (icq) And I run my own wisp!
64.146.146.12 (net meeting)
www.odessaoffice.com/wireless
www.odessaoffice.com/marlon/cam
----- Original Message ----- From: "James McKinion"
<[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, February 07, 2006 2:58 PM
Subject: Re:[WISPA]Farmers Wanting full Farm Coverage
We have had two commercial cotton farms in Mississippi under complete
wireless local area network coverage for about 3 years in a current
demonstration project for precision agriculture applications. The
farm in eastern Mississippi has about 1600 acres of contiguous
farmland with gently rolling land. We used Alvarion BreezeAccess II
equipment with an omni antenna at thebase station to communicate to
three repeater station located at the edges of the farm. Directional
panel antennas connected to BreezeAccess II 2.4 GHz radios which then
went to Breezecomm radios connected to 120 degree sector antennas
which broadcast into the farm to the equipment in the fields. THe
farm equipment was equipped with Breezecom radios attached to omni
antennas. All of these radios are frequency hopping spread spectrum
radios. These have a range of about 2.5 miles talking from sector
antennas to omnis. Wifi will onlu have a range of 1500 feet talking
to omnis. An omni antenna is the only cost effective practical device
to put on a tractor, combine or truck. The other reason we chose
Alvarion is that their radios automatically handle mobility. That is,
they can automatically hand over communcation from sector to sector as
boudaries are crossed with loosing connection or packets of data.
This system has a user data rate of 2 Mbps. The base station has a
Starband satellite link to the Internet. We have also used DirecWay
satellite links.
The other farm is located in the Mississippi Dellta and is set up
similarly with the exception being that the communication from the
base station to the 9 repeater stations is handled using the Waverider
900 MHz radios. This farm consists of over 12000 acrs of cotton
farmland separated by various tree lines and is roughly oval shaped
with the major axis being 12 miles from side to side with the farm
headquarters situated in the middle. We needed the 900 MHz radios to
penetrate the trre lines to reach the Breezecom repeaters with 120
degree sector antennas to provide field coverage. THe siganl from the
base station reaches almost 10 miles so the entire farm is covered by
the base station. However, you must use yagi antenna precisely aimed
to get reception. Thus, the use of the repeater station using
Alvarion Breezecom as before.
I can sen you a copy of the research paper we published if this is of
further interest to you.
James
Dr. James M. McKinion
USDA-ARS
Genetics and Precision Agriculture Res. Unit
P. O. Box 5367
Mississippi State, MS 39762
Ph: 662-320-7449
FAX: 662-320-7528
Email: [EMAIL PROTECTED]
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