Page:United States Statutes at Large Volume 63 Part 2.djvu/698

 (: STAT.] IMULTILA'TERAL-TELECOMMUNICATIONS-OCT. 2 . 1947 (App. 5 RR) Table of Necessary Iandwidths Description and Class of Emission Necessary Bandwidth in Cycles per Second Examples Detail Designa- tion of Emi-ion I. AMPLITUDE MODULATION Continuous wave Telegraphy Al Telegraphy modulated at audio frequency A2 Commercial Telephony A3 Broadcasting A3 BK K = 5 for fading circuits K = 3 for non-fading circuits BK+2M K = 5 for fading circuits K - 3 for non-fading circuits At, for single sideband 2M1f, for double sideband 2M Morse code at 25 wor(d per minute, B - 20, Bandwidth: 100 c/s Four channel multiplex, 7 unit code, iO words per minute per channel, B-170,K -5, Bandwidth: 850 c/s Morse code at 25 words per minute with I 000- cycle tone, B-20, Bandwidth: 2 100 c/8 For ordinary single sideband telephony,. 1 3 000 For high-quality single sideband telephony, M-4000 M may vary between 4 000 and 10000 depending upon the quality desired. 81939 0-52 - PT. i - --45_ 1995 O.IAI 0.85A1 2.1A2 3A3a 4A3a 8A3 to 20A3 .

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