Page:United States Statutes at Large Volume 63 Part 2.djvu/534

 63 STAT.] MULTILATERAL-TELECOM.3IUNICATIONS-OCT. 2, 1947 1831 (Chapter XIII, art. 29 RR) (62a430) 622 §9. Indication of the Frequency to be Used for Traffic. 623 (1) The call, as described in 616, must be followed by the service abbreviation indicating the frequency and, if use- ful, the class of emission which the calling station proposes to use for the transmission of its traffic. 624 (2) When, as an exception to this rule, the call is not followed by an indication of the frequency to be used for the traffic: 625 a) if the calling station is a land station: it indi- cates that this station proposes to use for traffic its normal working frequency indicated in the list of stations. 626 b) if the calling station is a mobile station: it indi- cates that the frequency to be used for traffic is to be chosen by the station called from amongst the frequencies on which the calling station can transmit. 627 § 10. Indication of the Number of Radiotelegrams or of Transmissionin Series. 628 (1) When the calling station has more than one radio- telegram to transmit to the station called, the above mentioned preparatory signals are followed by the service abbreviation and the figure giving the number of such radiotelegrams. 629 (2) Moreover, when the calling station wishes to send its radiotelegrams in series, it indicates this by adding the service abbreviation for requesting the consent of the station called. 630 § 11. Form of Reply to Calls. The reply to calls is made as follows: - call sign of the calling station, not more than three times; - the word DE; - call sign of the station called.

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