What Coding Form Was Used in Early Radio Communication?

The original radio signals were transmitted in the form of Morse code, because Morse code encodes English letters and numbers into two states of dots and horizontal lines, which is simple to encode and easy to transmit. We often see telegraph operators in war movies pressing the keys "did-d-d-da" in movies, which is the use of Morse code to send telegrams.

Morse code telegraph played a pivotal role in early radio applications, and its copying and sending skills must be mastered by every operator. Due to the advancement of communication technology, traditional systems such as international maritime communication stopped using Morse code in 1999, but because it occupies the least bandwidth and has strong anti-interference ability, it still has certain applications in real life.

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