Portable broadcasting stations in the United States

Portable broadcasting stations in the United States was a category of AM band radio stations, which were not restricted to operation in a specific community, but instead were permitted to be transported for broadcasting from various locations. These authorizations began in the early 1920s during a period when radio regulation in the United States was the responsibility of the Department of Commerce. However, after the newly formed Federal Radio Commission (FRC) took over in early 1927, it was decided that allowing stations to make unrestricted relocations was impractical, and in 1928 the FRC announced that existing portables that had not settled into permanent locations would be deleted. Station owner C. L. Carrell attempted to overturn the new policy, but was unsuccessful.