The Radio Act of 1912: licenses and wavelengths
Operating a radio station in interstate or foreign commerce now required a license from the Secretary of Commerce and Labor. Private stations not doing commercial business were held to wavelengths of 200 meters or less (about 1,500 kHz and up) and 1 kilowatt of input power.
Before
Not described in the Act itself.
After
Licensed stations on assigned wavelengths; ship and coast stations had to be able to send on 300 and 600 meters (about 1,000 and 500 kHz).
Sources
Provisional