Having installed backtrack a year or so ago, i always had an issue with my external wireless adapter The problem was that after i had successfully connected to my network, after a minute or so the connection would just completely drop.. but it would still tell me that i was connected to the network.
I have now found a 'Permanent' fix for this issue:
Firstly, make sure your Alfa AWUS036H is connected to your pc/laptop.
Now open a new terminal and type the following:
or wlan0, whichever your card is on. use "ifconfig -a" to find out
ifconfig wlan1 down
This sets the country code to boliva so you can use the alfa card in max power.
This sets your card to 30db which is the max power the card uses
iwconfig wlan1 txpower 30
This should fix the connection drop or very slow internet problem [main issue for me]
iwconfig wlan1 rate 1M
Now you are almost done, just type the following:
Now just open your network manager and connect to your network and the problem should be fixed.