Page:United States Statutes at Large Volume 63 Part 2.djvu/304

 0S STAT. J MILTIIATEIAL-TELECO(MMUAINICATIONS-OCT. 2, 1947 1601 (Chapter II, art. 2 RR) (78-80) 78 (3) Supplementary characteristics: a) Double sideband, full carrier (none) b) Single sideband, reduced carrier a c) Two independent sidebands, reduced carrier b d) Other emissions, reduced carrier c e) Pulse, amplitude modulated d f) Pulse, width modulated e g) Pulse, phase (or position) modulated f 79 § 4. Note: As an exception to the above principles, damped waves are designated by B 80 §5. The classification of emissions is tabu- lated below: Type of Trnsmission Supplementary Type of Transmission IA . . - .. Absence of any modulation Telegraphy without the use of modulating audio frequency (on- off keying) Telegraphy by the keying of a modulating audio frequency or audio frequencies or by the keying of the modulated emission (special case: an unkeyed modulated emis- sion) Telephony Cnaracierlstlcs -- - Symbol AO Al - A2 Double sideband, full carrier A3 Single sideband, re - duced carrier iA3 Type of Modulation Amplitude Modulated nln _ ________

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