Wireless connection breaks when I plug in AC adapter

I have an Acer-9300 with an internal wireless card. I connect to the
internet server fine with a strong signal indicated but when I plug in
my AC adapter it disconnects and shows no wireless signal available.
I disconnect the AC adapter and it will re connect. Any suggestions
on what to do will be appreciated. I am using an unsecured provider
in a campground in Mazatlan. Please respond to the above email
address. 2/1/08