Question

How much feet coverage for each dBi gain (with or without Booster Amplifier)?

Asked by: anushahanna

I am not sure how much gain Antenna will I need for my WAP54G Access Point to extend it's coverage. Some seem to have Booster along with it.

I am looking at these 2:
http://downloads.linksysbycisco.com/downloads/hga7t-ds-uk,0.pdf which has 7 dBi

http://www.radiolabs.com/products/wireless/wifi-booster.php has 5 dBi and Booster Amplifier also. It also has some parameters that I do not understand yet: 750mw, +29dBm

Can you please help me to understand these different values, so it will help me understand what is the right antenna I need to get.

Right now, I have 150 ft coverage with my Linksys WAP54G and I hope to extend it to 500 ft with an booster/antenna.

Thanks for your help!

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Asked On
2009-08-22 at 19:18:18ID24674190
Tags

Range Extenders

Topics

Wireless Networking

,

802.11 Wireless Access Points

,

Wireless Network Access Points

Participating Experts
1
Points
500
Comments
6

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Answers

 

by: wiscomPosted on 2009-08-23 at 00:26:25ID: 25161636

Hi,

Firstlly the site is maybe down ...

Secondly you need a least a 12dbi antenna to reach this distance. As you know, the more distance the weaker the signal !

This is what you need: "12dbi Outdoor Directional Patch Antenna"
http://www.gnswireless.com/GNS1404.htm

Compare it with this solution: "54mbps Outdoor Wireless Bridge Kit (2.5 Miles)"
http://www.gnswireless.com/GNS5410.htm

Good Luck.

A/

 

by: anushahannaPosted on 2009-08-23 at 06:37:18ID: 25162533

surpising that 12dbi gives 500 ft and 15 gives 2.5 miles. Big difference.

500 ft of good coverage is good for me.

Should I be concerned about mw & dBm? or only dBi.

the gnswireless 12 dBi is out of stock.

 

by: wiscomPosted on 2009-08-23 at 08:03:13ID: 25162876

Hi,

I will investigate this things. To be continued ....

A/

 

by: anushahannaPosted on 2009-08-25 at 17:50:22ID: 25183638

seems like each carrier have their own dbi standard. How does that work?

For example, some have 10dbi and have 2 miles and some have the same and less than 1 mile etc

 

by: wiscomPosted on 2009-09-02 at 00:20:12ID: 25238605

Hi,

First some theory.

E.I.R.P. value is what's all about. This stands for "Equivalent Isotropically Radiated Power".

The EIRP allows comparisons between different emitters regardless of type, size or form. From the EIRP, and with knowledge of a real antenna's gain, it is possible to calculate real power and field strength values.

This is the used formula:

E.I.R.P. = output power device (dBm) + antenna gain (dBi) - signal loss (dB)

I have attached a Calculator tool, you can select the different values and see what the aprox. distance you can reach !!!

A/

 

by: anushahannaPosted on 2009-09-16 at 19:27:03ID: 25352366

Thanks wiscom, for the research and help.

20120131-EE-VQP-002

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