 Radio communication was by radiotelegraphy; at the sending end, an operator tapped on a switch which caused the radio transmitter to produce a series of pulses of radio waves which spelled out text messages in Morse code.At the receiver these sounded like beeps, requiring an operator who knew Morse code to translate them back to text.This type of radio was used exclusively for person-to-person text communication for commercial, diplomatic and military purposes and hobbyists; broadcasting did not exist.