CROSSTALK BETWEEN COAXIAL CONDUCTORS 



377 



COMPUTED (ASSUMING CROSSTALK IN 

 ANY LENGTH IS DIRECTLY PROPOR- 

 TIONAL TO THAT IN 73 FEET) 



FREQ.IN 

 KC 





200 300 500 1000 2000 



LENGTH IN FEET 



5000 10,000 



Fig. 9 — Far-end crosstalk vs. length with tertiary terminated. 



Near-End Crosstalk Summation 



The curves on Fig. 10 show the amount of near-end crosstalk reduc- 

 tion due to the presence of the sheath and quads for a length of about 

 five miles. The upper curve was computed from tests on a 73-foot 

 length with tertiaries terminated by raising the values measured 



100 

 105 

 110 



</) 115 



_i 



UJ 



5 120 



o 



UJ 



"il 135 



O 



a. 



O 140 



80 100 150 200 300 400 500 600 



FREQUENCY IN KILOCYCLES PER SECOND 



Fig. 10 — Near-end crosstalk in a 5-mile length with tertiary terminated. 



