11 Facts About Wireless telegraphy

In radioWireless telegraphy, information is transmitted by pulses of radio waves of two different lengths called "dots" and "dashes", which spell out text messages, usually in Morse code.

RadioWireless telegraphy was used for long-distance person-to-person commercial, diplomatic, and military text communication throughout the first half of the 20th century.

Wireless telegraphy or radiotelegraphy, commonly called CW, ICW transmission, or on-off keying, and designated by the International Telecommunication Union as emission type A1A or A2A, is a radio communication method.

Morse code radioWireless telegraphy was gradually replaced by radioteletype in most high volume applications by World War II.

In manual radioWireless telegraphy the sending operator manipulates a switch called a telegraph key, which turns the radio transmitter on and off, producing pulses of unmodulated carrier wave of different lengths called "dots" and "dashes", which encode characters of text in Morse code.

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RadioWireless telegraphy is obsolete in commercial radio communication, and its last civilian use, requiring maritime shipping radio operators to use Morse code for emergency communications, ended in 1999 when the International Maritime Organization switched to the satellite-based GMDSS system.

RadioWireless telegraphy is popular amongst radio amateurs world-wide, who commonly refer to it as continuous wave, or just CW.

Since 2003, knowledge of Morse code and wireless telegraphy has no longer been required to obtain an amateur radio license in many countries, it is still required in some countries to obtain a licence of a different class.

Wireless telegraphy continued to be used for private person-to-person business, governmental, and military communication, such as telegrams and diplomatic communications, and evolved into radioteletype networks.

The ultimate implementation of wireless telegraphy was telex, using radio signals, which was developed in the 1930s and was for many years the only reliable form of communication between many distant countries.

Continuous wave radioWireless telegraphy is regulated by the International Telecommunication Union as emission type A1A.