54 STAT.] MULTILATERAL-TE LECOMMUNICATION-APR . 8, 1938 [436] (c) The signal ....- (end of work) shall also be used when the transmission of radiotelegrams of general in- formation, meteorological information, and general safety warnings is ended and the transmission ends in the long-distance radio-communication service with deferred acknowledgment of receipt or without acknowl- edgment of receipt. [437] §8. DURATION OF WORK (1) (a) In no case, in the maritime mobile service, must the work on 500 kc (600 m) exceed 5 minutes. (b) In no case, in the aeronautical mobile service, must the work on 333 kc (900 m) exceed 5 minutes. [440] (2) On frequencies other than those of 500 kc (600 m) and 333 kc (900 m) the duration of the periods of work shall be determined: (a) between a land station and a mobile station, by the land station, (b) between mobile stations, by the receiving station. [443] §9. TESTS When it is necessary to make test signals, either for the adjustment Testa. of a transmitter before transmitting the call, or for the adjustment of a receiver, these signals must not last more than 10 seconds, and they must be composed of a series of V's followed by the call signal of the station transmitting for the tests. ARTICLE 18 General Call "to all" [444] §1. Two types of call signals "to all" shall be recognized: [445] 1. the CQ call followed by the letter K (see §§2 and 3) [Nos. 447 and 448]; [446] 2. the CQ call not followed by the letter K (see §4) [No. 449]. [447] §2. Stations desiring to enter into communication with sta- tions of the mobile service, without however, knowing the names of the mobile stations within their range, can use the inquiry signal CQ, in place of the call signal of the station called, in the calling formula, this formula being followed by the letter K (general call to all mobile stations, with request for reply). [448] §3. In regions where traffic is heavy, the use of the CQ call followed by the letter K shall be forbidden. As an exception, it can be used with urgent signals. [449] §4. The CQ call not followed by the letter K (general call to all stations without request for reply) shall be used before trans- mission of information of all kinds intended to be read or used by anyone who can receive it. General call "to all." 1517 [438] [439] Duration of work. [4411 [4421
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