Page:United States Statutes at Large Volume 63 Part 2.djvu/302

 63 STAT.] MULTILATERAL-TELECOMMUNICATIONS-OCT. 2, 1947 (Chapter II, art. 2 RR) (74-77) CHAPTER II ARTICLE 2 Designation of Emissions 74 §1. Emissions are designated according to their classi- fication and the width of the frequency br.nd occupied by them. Section I. Classification , 7 §2. Emissions are classsified and symbolized according to the following characteristics: (1) Type of modulation (2) Type of transmission (3) Supplementary characteristics. 76 § 3. (1) Types of modulation: Symbol a) Amplitude A b) Frequency (or phase) F c) Pulse P 77 (2) Types of transmission: a) Absence of any modulation intended to carry information 0 b) Telegraphy without the use of modu- lating audio frequency 1 c) Telegraphy by the keying of a modulat- ing audio frequency or audio frequen- cies or by the keying of the modulated emission (special case: an unkeyed modulated emission) 2 d) Telephony 3 e) Facsimile 4 f) Television 5 g) Composite transmissions and cases not covered by the above 9 1599

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