DIRECTIVITY STEERING FOR FADING REDUCTION 203 



be the apparently invariable fact that the earlier arriving pulses are the 

 lower in angle with the horizontal and are relatively stable in direction. 

 These tests suggested that a somewhat similar scheme of observations 

 would be useful to the present work since, if pulses were similarly 

 employed, one would actually see the effect on each individual path of 

 steering the antenna. 



Accordingly, cathode ray equipment was constructed employing a 



Fig. 8 — Cathode ray oscillograph pulse figures when using the circular sweep circuit. 

 The circumference is traversed by the spot in twenty milliseconds. 



circular sweep system, in place of the usual linear sweep, thus making 

 the entire time interval always in view. Figure 8 illustrates how the 

 pulses sometimes appeared during this sweep. Since the pulses were 

 always vertical, their definition was lost if permitted to slide down into 



Fig. 9 — Cathode ray oscillograph pulse figures when using the 

 elliptical sweep circuit. 



