504 



BELL SYSTEM TECHNICAL JOURNAL 



30 



20 



10 



4:00 RM 



4:30 RM. 

 EASTERN STANDARD TIME 



5:00 RM. 



Fig. 11 — Comparison of simultaneous active fading on two slightly different wave- 

 lengths, vertically polarized transmission. 



30 



20 



I 

 o 



Z 10 



< 



2 



o 



^0 50 



< 40 



30 



1:30 P.M. 



1:35 RM. 1:40 RM. 



EASTERN STANDARD TIME 



1:45 RM. 



Fig. 12— Comparison of simultaneous "scintillation" fading on two slightly 

 different wave-lengths, vertically polarized transmission. The time scale has been 

 expanded. 



Effect of Distance and Antenna Height on Fading 



In planning this work a survey for a receiving site was made by 

 means of a portable receiver in a car. Later, simultaneous reception 



