63 STAT.] AMULTILATERAI-TELECOMMUNICATIONS-OCT. 2, 1947 1745 (Chapter V. art. 13 RR) (7n-a7) CHAPTER V Interference. Measures against Interference ARTICLE 13 Interference and Tests Section I. General Interference 372 §1. Unnecessary transmissions and transmission of su- perfluous signals and correspondence are forbidden to all stations. 373 §2. All stations shall radiate only as much power as is necessary to ensure a satisfactory service. 374 §3. In order to avoid interference: - locations of transmitting stations must be selected with particular care; - radiation in unnecessary directions shall be minimized, where the nature of the service per- mits, by taking the maximum practicable ad- vantage of the properties of directional antennas. 375 §4. Taking into account practical and technical consid- erations as well as the service to be performed, the class of emissions making use of the narrowest frequency band should be employed. 376 §5. If, while complying with the provisions of article 17, a transmitter causes harmful interference through the in- tensity of its harmonics or other non-essential emissions, special measures must be taken to eliminate such interference. Section II. Industrial Interference 377 §6. Administrations shall take all practicable and neces- sary steps to ensure that the operation of electrical apparatus
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