I purchased a USB wireless adaptor: EDIMAX EW-7811Un Wireless Nano Adapter . For the first time use,
it only detects the router in the same apartment. My internal wireless adaptor (in Lenovo T400) when it works can detect not only the router in the same apartment but also other routers in neighbour apartments. But my previous impression from reading on the internet is that a USB adaptor can detect routers that is farther away than an internal adapter can. So am I wrong?
also the speed seems slower with the USB one than with the internal one. Is it normal?