Morse code (CW)

Communication is through tones, which are generated by an ON/OFF switch in the transmitter. On the receiving side, the hearing of the operator decodes the tones. The characters of a text are coded according to the rules developed by Samuel F.B. Morse, in which all letters are composed of short and long tones.
 
For example, the letter A is the sequence of a short tone (= dot) and a long tone (= dash).
 
Of corse, understanding morse requires some training. The average speed of communication is 60 to 100 letters per minute.

Morse code (telegraphy) is a very efficient operating mode. It requires a small bandwidth, and requires only about 1/25 ot the transmit power of a voice communication. Morse code is still today a very popular mode among Radio Amateurs.

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