The bandwidth does depend on the soundcard. Most motherboard built in soundcards will support 48 kHz bandwith giving you +/- 24 kHz from the center frequency. I am using a M-Audio Delta 44 which gives me 96 kHz. You can also get soundcards that support 192 kHz. It does help to have a soundcard that has 2 stereo inputs and 2 stereo outputs (like the Delta 44) otherwise you will need to build some sort of switching circuit.
Regards, John G0ORX/N6LYT
