Page:United States Statutes at Large Volume 63 Part 2.djvu/308

 63 STAT.] MULTILATERAIL-TELECOMMUNICATIONS-OCT. 2, 1947 (Chapter II, art. 2 RR) Type of Transmission Telegraphy without the use of modulating audio frequency Telegraphy by the keying of a modulating audio frequency or audio frequencies, or by the keying of the modulated pulse (special case: an unkeyed modulated pulse) Telephony Composite transmissions and cases not covered by the above Supplementary Characteristics Audio frequency or audio frequencies modulating the pulse in amplitude Audio frequency or audio frequencies modulating the width of the pulse Audio frequency or audio frequencies modulating the phase (or position) of the pulse Amplitude modulated Width modulated Phase (or position) modulated Section 11. Bandwidth §1 §6. Wherever the full designation of an emission is necessary, the symbol for that class of emission, as given Type of Modulation 1605 (81) Symbol PI P2d P2e P2f P3d P3e P3f P9

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