47 C.F.R. § 2.301 Station identification requirement.
Title 47 - Telecommunication
Each station using radio frequencies shall identify its transmissions according to the procedures prescribed by the rules governing the class of station to which it belongs with a view to the elimination of harmful interference and the general enforcement of applicable radio treaties, conventions, regulations, arrangements, and agreements in force, and the enforcement of the Communications Act of 1934, as amended, and the Commission's rules. [34 FR 5104, Mar. 12, 1969]
Title 47: Telecommunication
PART 2—FREQUENCY ALLOCATIONS AND RADIO TREATY MATTERS; GENERAL RULES AND REGULATIONS
Subpart D—Call Signs and Other Forms of Identifying Radio Transmissions
§ 2.301 Station identification requirement.