Orb needs a Hardware Mpeg-2 encoder if your trying to send analog signals, if your trying to send just digital atsc you should be fine. heres a list of tuners orb promises to support. http://www.orb.com/system_requirements

and heres setup link

http://www.orb.com/live_tv_setup

But basicly goto the orb control panel and selet tv tuners and then select your tuner and run the setup wizard.