| 11. | Today, due to more modern text transmission methods, Morse code radiotelegraphy for commercial use has become obsolete.
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| 12. | High-paying jobs as seagoing ship's radiotelegraphy officers were still common until the late 20th century.
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| 13. | Radiotelegraphy proved effective for rescue work in sea disasters by enabling effective communication between ships and from ship to shore.
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| 14. | Continuous wave ( CW ) radiotelegraphy is regulated by the International Telecommunication Union ( ITU ) as emission type A1A.
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| 15. | Fessenden first used his large radio frequency alternator, After this it became the standard method of receiving CW radiotelegraphy.
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| 16. | As a result of these changes the wavelength used by Lympne for radiotelegraphy changed from 862 metres to 825 metres.
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| 17. | It was expanded many times in its coverage with the advent of radiotelegraphy, and with text messaging using telex machines.
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| 18. | Beginning around 1905 continuous wave ( CW ) transmitters began to replace spark transmitters for radiotelegraphy because they had much greater range.
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| 19. | The station was also used for the contact with Sveagruva on Svalbard and for radiotelegraphy with ships in the Gulf of Bothnia.
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| 20. | In Norway, the band 493 510 kHz was allocated to radio amateurs on 6 November 2009 . Only radiotelegraphy is permitted.
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