CROSSTALK BETWEEN COAXIAL CONDUCTORS 



383 



95 



100 

 105 



no 



115 



5 9S 

 < 



105 



120 



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



FREQUENCY IN KILOCYCLES PER SECOND 



Fig. 14 — Same as Fig. 12 except with all tertiaries continuous past the transposition. 



outer conductor tertiary circuit. ^^ However, a certain portion is also 

 due to differences between AB and A'B' (or BA and B'A'). 



On Fig. 14 are plotted far-end crosstalk values when two 12,000-foot 

 sections are combined with and without a transposition in one coaxial 



1* It should be noted here that these tests indicate directly the effect of a trans- 

 position at the center of a 24,000-foot section rather than at a junction between two 

 repeater sections in a long repeatered system. If 12,000-foot repeater spacing is 

 assumed with the transposition at the repeater point it is necessary to reduce the 

 measured far-end far-end interaction crosstalk and increase the measured near-end 

 near-end interaction crosstalk by an amount equal to the line loss in 12,000 feet. 

 These corrections put interaction crosstalk between repeater sections on an output- 

 to-output or equal level basis. 



