54 STAT.] MULTILATERAL-TELECOMMIUNI ATION-APR. 8, 1938 D. AERONAUTICAL SERVICES 1 [520] §8. (1) The general calling-waves, for the aeronautical serv- ices, shall be the following, except in regions where regional agree- ments providing otherwise are in effect: 333 kc (900 m), 6,210 kc (48.31 m) in addition to the use as indicated in article 7, §21 (1) (c) [No. 184]. Ant, p. 1471. [521] Other frequencies may, in addition, be selected as calling- waves by agreements between the interested governments. These frequencies, as well as the requirements for their use, shall be listed in the service documents published by the Bureau of the Union. [522] (2) The general waves for the reply in the aeronautical services shall be the following, except in regions where regional agreements providing otherwise are in effect: 333 kc (900 m), 6,210 kc (48.31 m) in addition to the use as indicated in article 7, §21 (1) (c) [No. 184]. At&.p .14n. [523] Other frequencies may be selected as waves for the reply by agreements between the interested governments. These frequencies, as well as the requirements for their use, shall be listed in the service documents published by the Bureau of the Union. [524] (3) Radio communications of aeronautical stations shall be regulated by regional agreements between the governments con- cerned, except as otherwise provided for in these Regulations. ARTICLE 22 Interference [525] §1. (1) The transmission of unnecessary or unidentified signals Interenee. or correspondence shall be forbidden to all stations. [527] (2) Tests and experiments shall be permitted in mobile stations if they do not interfere with the service of other stations. As for stations other than mobile stations, each administration shall judge, before authorizing them, whether or not the proposed tests or experiments are likely to interfere with the service of other stations. [528] §2. It is recommended that traffic relating to public correspond- ence be transmitted on type-Al waves rather than on type-A2 waves, and on type-A2 waves rather than on type-B waves. [529] §3. All stations of the mobile service shall be required to ex- change traffic with the minimum of radiated power necessary to in- sure good communication. [530] §4. Except in cases of distress, communications between on- board stations must not interfere with the work of the land stations. When this work is thus interfered with, the on-board stations which [526] 1 See article 21, 5§ 1, 2, and 3, for the use of the wave of 500 ke (600m) for calling and distress.
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