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). |
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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. |