Which agency sets limitations on radio power and frequency use?

The Federal Communications Commission (FCC) is the agency responsible for regulating interstate and international communications by radio, television, wire, satellite, and cable in the United States. One of its crucial roles includes setting limitations on radio power and frequency use to ensure that communications are efficient, reliable, and free from interference. By establishing these regulations, the FCC helps manage the radio spectrum, which is a limited resource, and promotes effective communication services for various public and private sectors.

In contrast, the other agencies listed have distinct functions that do not pertain to radio frequency management. The Federal Bureau of Investigation (FBI) primarily focuses on national security and law enforcement rather than communications regulation. The Federal Aviation Administration (FAA) oversees civil aviation and air traffic control, and while it may consider communications related to air traffic, it does not set broader radio regulations. The Federal Trade Commission (FTC) deals with consumer protection and antitrust laws, which are unrelated to communications frequency and power. Thus, the FCC is the appropriate agency for setting limitations on radio power and frequency use.