Page:United States Statutes at Large Volume 45 Part 2.djvu/1190

 2866 Conditions to be ob- served by mobile sta- tions. INTERNATIONAL RADIO CONVENTION. NOVEMBER 25, 1927. §4. With regard to technical and operating conditions which mobile stations holding licenses must satisfy, in the international radio service, the contI acting Governments undertake not to impose upon foreign mobile stations temporarily located within their territorial waters or temporarily located uJ?on their territories, conditions more severe than are contemplated In the present Regulations. These provisions do not affect in any way the provisions which, coming within the scope of the Convention for t,he Safety of Life at Sea, are not covered by the present Regulations. ARTICLE 16 Conditions to be observed by mobile stations §1. (1) Mobile stations must be established in such a way as to conform with reference to frequencies and types of waves, to the gen- eral provisions constituting the subject matter of Article 5. In accordance with these provisions, the use by mobile stations of damped waves (Type B) of a frequency below 375 kc/,> (wave length above 800 m.), shall be forbidden beginni!lg January 1, 1930. (2) In addition, no new installations of transmitters of Type B waves shall be made in mobile stations beginning January 1, 1930, except when these transmitters working on full power shall expend less than 300 watts measured at the input of the supply transformer at audible frequency. (3) Finally, the use of Type B waves of all frequencies shall be for- bidden beginnin~ January 1, 1940, except for transmitters fulfilling the same conditIOns re(arding power as above. §2. (1) Every station Installed on board a vessel or an aircraft follow- ing a maritime route, such vessel or aircraft being compulsorily equipped with radio apparatus in accordance with an international agreement, must be able to send and receive on a wave of 500 kc/s (600 m.) Type A2 or B. Ship stations must, in addition, be able to use the wave of 375 kc/s (800 m.), Type A2 (or B subject to the provisions of section 1 above). (2) Aircraft stations must be able to send and receive the wave of 333 kc/s (900 m.) Types A2 or A3 (or B subject to the provisions of section 1 above). §3. (1) In addition to the fixed waves stipulated above, mobile stations equipped to send waves of Types AI, A2 or A3 may use all the waves authorized in Article 5. (2) The use of waves of Type B shall be authorized only for the following frequencies (wave lengths): Kc/s Meters Kc/s Meters 375 ______________________ 800 500 ______________________ 600 410 ______________________ 730 665 ______________________ 450 425 ______________________ 705 1,000 _____________________ 300 454 ______________________ 660 1,364 _____________________ 220 (3) The use of the Type B wave of 665 kc/s (450 m.) shall be for- bidden hencefortb. in regions where this wave may interfere with broadcasting. . (4) The use of the Type B wave of 1000 kc/s (300 m.) for traffic shall be forbidden, henceforth, between 6:00 P. M. and midnight, local time, and shall be absolutely forbidden, at all times, beginning January 1, 1930 at the latest. This same Type B wave 0000 kc/s (300 m.) may, however, continue in use lI~definitely without restriction as to hours by stations on board fishing vessels, for radio- compass bearings among themselves, provided thElY do not interfere with broadcasting.

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