54 STAT.] MULTILATERAL-TELECOMMUNICATION-APR. 8, 1938 [388] (4) Indication, when required, of the number of radiotelegramsor of tran- mission by series [389] When the calling station has more than one radiotelegram to transmit to the station called, the preceding preparatory signals shall be followed by the regulatory abbreviation and by the figure specifying the number of these radiotelegrams. [390] Furthermore, when the calling station wishes to transmit these radiotelegrams in series, it shall so indicate by adding the regulatory abbreviation requesting the consent of the station called. [391] §5. REPLY TO CALLS AND SIGNALS PREPARATORY TO TRAFFIC [392] (1) Method of reply to calls The reply to calls shall consist of the following: not more than three times the call signal of the calling station; the word DE; the call signal of the station called. [393] (2) Wave for reply [394] To transmit the reply to calls and to preparatory signals, the station called shall use the wave on which the calling station must listen, unless the calling station has specified a frequency for the reply. [395] As an exception to this rule, when a mobile station calls a coast station on the wave 143 kc (2,100 m), the coast station shall transmit the reply to the calls on its normal working-wave of the bands between 100 and 160 kc (3,000 and 1,875 m), as indicated in the nomenclature. [396] (5) Understandingas to the wave to be used for the traffic [397] A. If the station called has an understanding with the calling station, it shall transmit: [398] (a) the reply to the call; [399] (b) the regulatory abbreviation indicating that from that time on it is listening on the frequency and/or the type of wave announced by the calling station; [400] (c) in some cases, the indications mentioned in paragraph (4) [No. 409]; [401] (d) the letter K, if the station called is ready to receive the traffic of the calling station; [402] (e) in certain cases, if it is useful, the regulatory abbreviation and the figure indicating the strength of the signals re- ceived. (See appendix 12.) Po, p. HIt. [403] B. If the station has no preliminary understanding, or if it must choose the wave to be used for the traffic, it shall transmit: [404] (a) the reply to the call; [405] (b) the regulatory abbreviation indicating the frequency and/or the type of wave requested;* [406] (c) in some cases, the indications mentioned in paragraph (4) [No. 409]. [408] *In the case where the choice of the wave to be used for the traffic falls to the station called, and if, in exceptional cases, the latter station does not give the corresponding indication, the traffic shall take place on the wave used for the call. 193470--41-PT. I - 18 1511
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