INTERNATIONAL RADIO CONVENTION. NOVEMBER 25,1927. 2853 §14. In order to facilitate the exchange of synoptic meteorolog;cal Uses. -CoDtiDued. messages in European regions, two frequencies between 37.5 and 100 kc/s (wave lengths of 8,000-3,000 m.) shall be allocated to this service by regional arrangements. §15. To facilitate rapid transmission and distribution of information of value in the detection of crime and pursuit or criminals, a frequency between 37.5 and 100 kc/s (wave lengths of 8,000-3,000 m.) shall be reserved for this purpose by regional alTangements. §16. (1) The frequencies assigned by Administrations to all new fixed land or radio broadcasting stations which they may ha.ve author- ized or of which they may have undertaken the installation must be chosen in such a manner as to pre-vent so far as practicable inter- ference with international services carried on by existing stations the frequencies of which have already been notified to the International Bureau. In the case of a change of the frequency of an existing fixed land or broadcasting station, the new frequency assigned to this station must comply with the above conditions. (2) The interested Governments shall agree, in case of need, upon the determination of the waves to be assigned to the stations in ques- tion as well as UpO:.l the conditions for the use of waves so assigned. If no arrangement intended to eliminate interference can be arrived at, the provisions of Article 20 of the Convention may be applied. §17. (1) Each administration shall promptly advise the Interna- tional Bureau when it decides upon, or authorizes, the establishment of a radio communication station, the operation of which necessitates the assignment for its regular service of a particular frequency below 37.5 kc/s (wave length above 8,000 m.) in the case where the use of this frequency might cause international interference over broad areas. This notice must reach the International Bureau four months prior to the construction of the station contemplated in order to dispose of objections which any of the Administrations might raise against the adoption of the proposed frequency. (2) In the case of a fixed short wave station intended to carry on regular service and the radiation of which would be likely to cause international interference, the Administration concerned must, as a general rule, before the completion of the station and in any case before it is open for service, notify to the International Bureau the frequency assigned to that station. (3) Such notification, however, shall be sent only when the Adminis- tration concerned shall have ascertained that the service in question can be established within a reasonable time. §18. (1) Each Administration may assign to amateur stations fre- AmateurstatiODJ!. quencies chosen from the bands allotted to amateurs in the allocation table (section 7 above). (2) The maximum power which these stations may use shall be fixed by the Administration concerned, taking into account the technical qualifications of the operators and the conditions under which the stations must work. (3) All the general rules fixed in the Convention and in these Regu- lations apply to amateur stations. In particular, .the frequency of the waves emitted must be as constant and as free from harmonics as the state of the art permits. (4) In the course of their transmission, these stations must transmit their call signals a.t frequent intervals. ARTICLE 6 Service oj private experimental statwns §1. The excha.nge of communications between private experimental stations of different countries shall be forbidden if the Administration Service of private ex· perimental stations.
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