63 STAT.] MULTILATERAL-TELECOMMUNICATIONS-OCT. 2 , 1947 (Chapter XIII, art. 30 RR) (682-) 682 (2) Aircraft stations when communicating with sta- tions of the maritime mobile service must use the procedure laid down in this article. 683 § 2. (1) As a general rule, it rests with the mobile station to establish communication with the land station. The mobile station may call the land station, for this purpose, only after coming within the range of action of the land station. 684 (2) However, a land station having traffic for a mobile station may call this station if it has reason to believe that the mobile station is within range and is keeping watch. 685 § 3. (1) In addition, every coast station must, so far as prac- ticable, transmit its calls in the form of "traffic lists" consist- ing of the call signs in alphabetical order of all mobile sta- tions for which they have traffic on hand. These calls are made at specified times fixed by agreement between the ad- ministrations concerned and at intervals of at least two hours and not more than four hours during the working hours of the coast station. 686 (2) Coast stations transmit their traffic lists on their normal working frequency. 687 (3) They may, however, announce this transmission by the following brief preamble sent on a calling frequency: - CQ DE . . . (call sign of the calling station) - QSW followed by the indication of the working frequency on which the traffic list is about to be sent. In no case may this preamble be repeated. 688 (4). The provisions of 687 are obligatory where the frequency 500 kc/s is involved. 689 (5) They do not apply to the bands of frequencies be- tween 4 000 and 23 000 kc/s. 690 (6) The hours at which coast stations transmit their traffic lists and the frequencies and classes of emission which 1845
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