INTERNA.TIONAL RADIO CONVENTION. NOVDIBER 25,1927. 2. A station used by an U amateur," i. e., by a duly authorized person interested in radio technique solely with a personal aim and without pecuniary interest. The term "administration" means a Government administration. ARTICLE 2 I.Jiam6 §1. No radio transInitting station shall be established or operated by a~ individual or by a private enterprise without special license issued by the Government of the country to which the station in question is subject 12. The holder of a license must undertake to preserve the secrecy of correspondence, both telegraph and telephone. Moreover, the effect of the license must be that the interception of radio corre- 'spondence other than that which the station is authorized to receive is forbidden, and that, in the case where such correspondence is in- voluntarily received, it must not be :reproduced in writing, com- municated to others, or used for any purpose. §3. In order to facilitate the verification of licenses it is recom- mended that there be added, where necessary, to the text written in the vernacular, a translation of this text into a language more generally used in international relations. ARTICLE 3 (J/wice and calibration of apparatus §1. The choice of radio apparatus and devices to be used by a station shall be unrestricted, provided the waves eInitted comply with the provisions of these Regulations. §2. (1) The Administrations must take the necessary measures to assure themselves that the frequency meters (wave meters) employed in the adjustment of the transInitting apparatus are as accurately calibrated as possible by comparison with their national standard instruments. (2) In case of international disagreement, the comparisons shall be made by an absolute method of measuring frequencies. ARTICLE 4 Classification and 'USe of rcu1io emissiom §1. (1) Radio emissions shall be divided into two classes: A. Continuous waves, B. Damped waves, defined as follows: Class A.- Waves the successive oscillations of which are identical under permanent conditions. Class B.- Waves consisting of successive trains in which the ampli- tude of the oscillations, after having reached a maximum, decreases gradually. (2) Waves of Class A include the following types, which are defined below: Type Al: Unmodulated continuous waves. Continuous waves, the amplitude or frequency of which is varied by means of telegraphic keying. 2849 License. Requirements. Choice and calibra- tion of apparatus. C lassiftcation and use of radio emissions.
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