. The Bell System technical journal . the amplitude is at a can, therefore, trace a relation between quality distortion andfading by such an analysis, assuming a constant percentage modula-tion. Fig. 47 shows a series of high-frequency wave envelopes ob-tained by this method of graphic analysis. The mean vector rela-tion is represented by 4>o, and for <^o = 180 degrees the fading may beconsidered at a minimum. The waves shown in Fig. 47 being en-velopes of the^high frequency will undergo certain changes in theprocess of detection. These, however, would only slightly modifythe


. The Bell System technical journal . the amplitude is at a can, therefore, trace a relation between quality distortion andfading by such an analysis, assuming a constant percentage modula-tion. Fig. 47 shows a series of high-frequency wave envelopes ob-tained by this method of graphic analysis. The mean vector rela-tion is represented by 4>o, and for <^o = 180 degrees the fading may beconsidered at a minimum. The waves shown in Fig. 47 being en-velopes of the^high frequency will undergo certain changes in theprocess of detection. These, however, would only slightly modifythe wave. STUDIES IN BROADCAST TRANSMISSION 205 For purposes of comparison, a set of oscillograph pictures of rep-resentative received wave shapes is shown in Fig. 48. These repre-sent the actual effect of night-time transmission with frequencymodulation between 463 West Street, New York City and Stamford,Conn.; the modulating tone was a practically pure 264-cycle sinu-soidal wave. The samples havebeen arranged in successive order.


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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1