Page:United States Statutes at Large Volume 63 Part 2.djvu/310

 63 STAT.] MULTILATERAI-TELECOMMUNICATIONS--OCT. 2, 1947 (Chapter 1 art. 2 RR) (82-4) above, is prefixed by a number indicating the width in kilo- cycles of the frequency band occupied by it (see 58). 82 §7. Bandwidths of 10 kilocycles or less shall be ex- pressed to a maximum of two significant figures after the decimal. 83 §8. For the necessary bandwidths of various classes of emissions, see appendix 5. 84 §9. The following are examples of the designation of emissions. Description 1. Telegraphy 25 words per minute, International Morse Code, carrier modulated by keying only 2. Telegraphy, 525 c/s tone, 25 words per minute, International Morse Code, carrier and tone keyed or tone only keyed 3. Amplitude modulated telephony, 3 000 c/s maximum modu- lation, double sideband, full carrier 4. Amplitude modulated telephony, 3 000 c/s maximum modu- lation, single sideband, reduced carrier 5. Amplitude modulated telephony, 3 000 c/s maximum modu- lation, two independent sidebands, reduced carrier 6. Vestigial sideband television (one sideband partially suppressed), full carrier (including a frequency modulated sound channel) 7. Frequency modulated telephony, 3000 c/a modulation fre- quency, 20 000 c/s deviation 8. Frequency modulated telephony, 15 000 c/s modulation fre- quency, 75 000 c/s deviation 9. One-microsecond pulses, unmodulated, assuming a value of 6 for K (see appendix 5) Designation 0.1 Al 1.15 A2 6A3 3 A3a 0 A3b 6 000 A5,F3 46 F3 180 P3 10000 PO 1607

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