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Old 02-02-2008, 11:37 PM
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Join Date: Feb 2008
Posts: 7
Cool Major Wifi Project, you will find it Very Interesting

Im building a wifi Tower which i'm using to supply a whole community with wireless internet, i bought a 15dbi omni directional antenna and a 24dbi directional antenna.I am thinking of putting the tower about 8ft above the height of the houses which is 9 1/2 ft high. Note the Community is Really big and im on a little hill which is the highest point of the community..

I need some help to construct this Successfully, i will be here to give all the info you need to help me out..

Please note that i want to use a pci wireless card on all of the client machines without them have to use a outdoor antenna..

My Wirelss Ap is a US Robotics 1908.

Technical Specification of the 15 dbi omni antenna...
Frequency Range 2400 to 2500 MHz
Gain 15 dBi
Impedance 50 ohms
Polarisation Linear Vertical
Connector RP SMA Male or N-Type Female
Dimensions Height 1860mm Depth 40mm

SUMMARY of 24dbi Directional antenna....

2.4 GHz ISM Band
Wireless Bridges
Backhaul Applications
IEEE 802.11b and 802.11g Wireless LAN
WiFi Systems
Point to Point Systems
Point to Multi-point Systems
Long-range Directional Applications
8 beam-width
24 inch coax lead

Please For all your help..Thanks
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Old 02-03-2008, 11:03 AM
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Join Date: Dec 2007
Posts: 120
Default

USR1908? Did you mean 9108?
As you are the one who is going to maintain it you are going to be on a steep learning curve. Suggest you start reading:-
http://802.11junk.com/jeffl/crud/Int...ot%20Guide.pdf
Although you are not setting up a hotspot you will find some useful info.

http://www.3com.com/other/pdfs/produ..._US/101900.pdf
Look at the attenuation figures for building materials at 2.4GHz

Link Calculators
Support :: Calculations :: System Operating Margin :: Terabeam Wireless
Wireless Network Link Analysis
Link Calculator : Wifi Extreme, Outdoor Wireless Systems

Coax Attenuation calculator
http://www.timesmicrowave.com/cgi-bin/calculate.pl
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Old 02-04-2008, 07:50 PM
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Join Date: Feb 2008
Posts: 7
Cool Tanks Alot

yes its a 9108 and i will be doing everything my self..more help would be grateful thanks
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Old 02-05-2008, 09:16 AM
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Join Date: Dec 2007
Posts: 120
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I will give you one more piece of info, another calculator.
Omnidirectional Antenna Beamwidth Analysis
You say you have bought a 15dB omni and although you haven't quoted the vertical beamwidth it is normally about 7 or 8 degrees.
You don't say how high your hill is, so lets call it 4ft.
You don't say how high your house is, so lets call it 9ft.
Your mast is 8ft high.
Your Antenna is approx 6ft.
Height to the center of the Antenna = 24ft
If you put this info in the calculator you will see that the lower 3dB lobe intersects the ground at 0.065 miles, 105 metres.
It would intersect the roof of a 9ft house approx 60 metres away.
When you factor in the attenuation caused by building materials there is a good chance that anyone living within a 50 metre radius of your house will not get a wireless connection.

Last edited by Leaky_coax; 02-05-2008 at 09:21 AM..
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Old 02-05-2008, 08:12 PM
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Join Date: Feb 2008
Posts: 7
Cool Thanks

Thanks alot ur great...

The antenna is 15dbi 9degrees vertical beam
The House is 9ft
The antenna is 7ft tall


The info u gave me was really great..thanks
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Old 02-10-2008, 11:38 PM
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Join Date: Feb 2008
Posts: 7
Default Thanks

anymore info would be even more nicer from anyone else
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Old 03-02-2008, 08:01 AM
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Join Date: Mar 2008
Posts: 21
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You will really need some commercial equipment, There is a manufacture in Taiwan i use with offices in canada, www.zigwire.net i told them what i wanted to do and they sent me a comprete design at no charge !!!, And their equipment is 60% less of the Motorola canaopy stuff
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