VOLUME XXVI APRIL, 1947 no. 2 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



DEVOTED TO THE SCIENTIFIC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



Publk Ubnn 



Radar Antennas H. T. Friis and W. D. Lewis 219 



Probability Functions for the Modulus and Angle of the 

 Normal Complex Variate Ray S. Hoyt 318 



Spectrum Analysis of Pulse Modulated Waves 



/. C. Lozier 360 



Abstracts of Technical Articles by Bell System Authors. . 388 



Contributors to This Issue 394 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



NEW YORK 



50i per copy $1.50 per Year 



