Not legal in any country.
Well here is some information but probably not any help. :(
Originally Posted by xxXen0xx
To get that kind of range you may have to go to a Yagi antenna, to use the highly directional Yagi antenna you will need a direct line of sight to the other point. No obstructions! The alpha is rated at 1/2 Watt (500 milliwatts) this gives you a 27dBm gain from your Alpha and possibility 24dBi from a Yagi (there may be higher gain antennas out there.) Now the problem is this may be already way over the legal maximum for the USA but I am not worried about that, you might have to be. The range at 11 mb/s goes something like this. 27dBm will give a guaranteed 11 mb/s connection at 450 meters (clear air no obstructions). Now for every 6dBm(i) added you double the range (clear air no obstructions.) So with the 24dBi gain Yagi you have 4 sixes or 900 meters, 1800 meters 3600 meters and 7200 meters is the final answer for the described rig, or something like 4.47 miles (clear air no obstructions, get the hint yet?) To get out further you will need more of an amplifier and / or more of an antenna gain. :eek:
Since the antenna gain is topped out you will have to go with a different type of wifi adapter and a larger amplifier between it and the antenna, 4 watts is 6 dBm more than the alpha. Now you are in the highly illegal area of microwave radio. You will also need to be very careful as you are getting into some very harmful microwave cooking power. The first described rig, Yagi and Alpha 51dBm, is already over 125 Watts (Do not stand in front of the antenna when it is transmitting.) :cool: Try looking up dBm to watt conversion tables or calculators to see what I mean. The scale for dBm to power flattens out very quickly over 40dBm in fact from 46dBm to 47dBm it takes 10 Watts for that one dBm. For instance if you wanted to double the range of the 51dBm rig you would have to add another 6dB for 57dBm total. How you would do that is find a 4 Watt signal transmitter booster and signal receiver booster. You will need to amplify the incoming signal as much as the outgoing signal. Unless your friend matches your rig then the out will be good enough. Now you are over 500Watts of total combined power and out to about 9 miles (clear air no obstructions).
The problem is, if you are in the USA, you can't purchase these amplifiers unless you are a licensed radio operator (I think an amateur license will do.) :o You may want to settle on another type of radio rig for this setup, one not quite so expensive, dangerous, or illegal. It could be a bad sign if there are cooked squirrels and birds at the bottom of your antenna pole. :rolleyes:
I think it would be cheaper to just move closer to your friend. Or just drive when you want to play games together.......:)