and Amendments * * * * * PART 73 - RADIO BROADCAST SERVICES 1. The authority for Part 73 continues to read as follows: AUTHORITY: 47 U.S.C. 154 and 303. 2. Subpart C, Noncommercial Educational FM Broadcast Stations, is renamed Subpart D 3. New Subpart C, Digital Audio Broadcasting, is added to read as follows: Subpart C-Digital Audio Broadcasting § 73.401 Scope. This subpart contains those rules which apply exclusively to the digital audio broadcasting (DAB) service, and are in addition to those rules in Subparts A, B, C, G and H which apply to AM and FM broadcast services, both commercial and noncommercial. * * * * * § 73.402 Definitions. (a) DAB. Digital audio broadcast stations are those radio