Page:United States Statutes at Large Volume 63 Part 2.djvu/542

 63 STAT.] MULTILATERAL-TELECOMMUNICATIONS-OCT. 2, 1947 (Chapter XIm art. 29 RR) (659-66) 659 § 18. Long Radiotelegrams. 660 (1) In principle, any radiotelegram containing more than 100 words is regarded as forming a series, or terminates a series already in course of transmission. 661 (2) In cases where both stations are able to change from sending to receiving without manual switching, the sending station may continue to send until all its traffic has been sent or until the receiving station breaks in on the trans- mission with the service abbreviation BK. Before commenc- ing, both stations normally agree on such a method of work- ing by means of the abbreviation QSK. 662 (3) If this method cannot be employed, long radiotele- grams, whether in plain language or in code or cypher, are, as a general rule, to be transmitted in sections, each section containing 50 words in the case of plain language and 20 words or groups if code or cypher is used. 663 (4) At the end of each section the signal.. - .. (?) meaning "Have you received the radiotelegram correctly up to this point?" is transmitted. If the section has been correctly received, the receiving station replies by sending the letter K and the transmission of the radiotelegram is continued. 664 § 19. Suspension of Traffic. When a station of the mobile service transmits on a working frequency of a land station and so causes interference with the transmission of such land station, it must suspend working at the first request of the latter. Section V. End of Traffic and Work 665 § 20. Signal for the End of Transmission. 666 (1) The transmission of a radiotelegram is terminated by the signal. - - the call sign of the sending station and the letter K. 1839
 * (end of transmission), followed by

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