Page:United States Statutes at Large Volume 49 Part 2.djvu/437

 TELECOMMUNICATION CONVENTION. DECEMBER 9, 1932. 2453 ARTICLE 6 Quality of Emissions [60J § 1. The waves emitted by a station must be kept on the author- ized frequency as exactly as the state of the art permits, and their radiation must be as free as practically possible from all emissions not essential to the type of communication carried on. [61] § 2. (1) The administrations shall, for the various cases of operation, determine the characteristics relative to the quality of the emissions, notably the accuracy and stability of frequency of the emitted wave, the level of harmonics, the width of the total frequency band occupied, etc., so that they will be in accord with technical progress. (62] (2) The administrations agree to consider the tables (appendix 1: Table of Frequency Tolerances and of Instabilities; appendix 2: Table of Frequency Band Widths Occupied by the Emissions) as a guide indicating for the various cases, the limits to be observed to the extent possible. [63J (3) Concerning the widths of frequency bands occupied by emissions, in practice the following conditions must be taken into account: 1. Width of the band as shown in appendix 2. 2. Variation of the frequency of the carrier wave. 3. Other technical conditions, such as the technical possibilities with regard to the form of filter circuit characteristics, both for transmitters and for receivers. [54] § 3. (1) The administrations shall frequently check the waves emitted by the stations under their jurisdiction to determine whether or not they comply with the provisions of the present Regulations. [65] (2) Effort shall be made to obtain international coopera- tion in this matter. [66] § 4. In order to reduce interference in the frequency bands above 6,000 kc (wavelengths below 50 m), the use of directive antenna systems is recommended when such use is compatible with the nature of the service. ARTICLE 7 AUocation and Use of FreqUtncies (Wavelengths) and of Types 01 Emission [67] § 1. Subject to the provisions of subparagraph (5) of § 5 below, the administrations of the contracting countries may assign any fre- quency and aollY type of wave to any radio station under their juris- diction on the sole condition that no interference with any service of another country will result therefrom. [68] § 2. The administrations, however, agree to assign to stations which by their very nature are capable of causing serious international Quality of emissions. Tables. Post, pp. 2585, 2589. Post, p. 2589. Fre'l uencies. Allocation, etc., of. Post, p. 245i.