Antennas.....

12db = 2 KM.
15db = 3km
21db = 5km
24db = 7km
27db = 10km


i dont want to make the calculation... any one can tell me if this is correct on a wireless network (this is for a directional antena)

 

yea thats great and all...but you need to amplify the power going into the antena.

and then remember, that the AP(access point) on the other side needs to be able to reach you.

 

i know that but im talking about the clean mesaure of the db on each antena....what im trying to say is if you get an antena with 12db you get 2km...... with a clean view of the receptor.....

 

You will need to take in account of the SNR (Signal to Noise Ratio).

2km might be pushing it for 12db even if its line-of-sight directional antenna.

If you really need the range, have a look at Hawking Signal Boosters

 

There were a contest in Las Vegas years ago, and they were able to establish a usable connection using Yagi beam antennas on each side .... Are you ready for this, 25 miles. Using no amps on the NB side if I recall. They did this out in the desert of course to get away from interference. Their beam antennas had to be sighted using spotting scopes and GPS units due to the great distance.

At the same conf their was another contest with bluetooth. Forget the myth that the distance is only 15-25 feet. They were able to intercept the conversations >1 mile away. So as it goes you must use encryption on every thing to keep from being eves dropped on.

 

I worked for an ISP and you can get some insane speeds over wireless. but your original post is not very clear. in theory thats all good, but your going to need clean power to the antenna and your going to have to keep it under 1W if I recall due to FCC limits.

 

You mean wrapping a cell phone with ethernet cable and sticking it in a salad bowl won't work?

http://www.youtube.com/watch?v=LY8Wi7XRXCA

 

^^ Lol!!!!

 

I have the same problem and now it has been sorted!

 

18dBi with the appropriate beam width should cover all those distances.