CROSSTALK BETWEEN COAXIAL CONDUCTORS 



373 



Cj 130 

 O 



y 135 



a ISO 



40 50 60 80 100 150 200 300 400 500 600 800 1000 



FREaUENCY IN KILOCYCLES PER SECOND 



Fig. 4 — Crosstalk components in 73-foot and 146-foot lengths. 



Now suppose that we consider two lengths which are considerably 

 longer so that equations (6) and (13) more nearly apply. Figure 5 

 shows the results of tests on and between two 1500-foot cable sections. 

 Here, in contrast with the 73-foot measurements, components Fi and 

 Fff are nearly equal in magnitude while F„n is quite small. Also, 

 Fff and Fi are in general phase opposition since their sum, Fi + Fff, 

 is considerably less than either component alone. 



50 60 



80 100 150 200 300 400 500 600 



FREQUENCY IN KILOCYCLES PER SECOND 



800 1000 



Fig, 5— Crosstalk components in 1500-foot and 3000-foot lengths. 



