Some digital broadcast tuners will accept direct channel entry with out scanning for digital channels first. Some digital broadcast tuners must scan first to find channels before direct channel selection can be made. Read and understand about , REAL Digital Broadcast Tv Channels , Virtual Digital Broadcast Tv Channels , Analog Broadcast Tv Channels ,
http://forum.tvfool.com/showthread.php?t=695 Be sure and rescan from time to time because new digital channels can begin transmission with out notice.