CABLE CROSSTALK 



193 



50 100 200 300 500 1000 



5 

 o 



^ 0.6 



300 400 500 600 700 



FREQUENCY IN KILOCYCLES PER SECOND 



Fig. 9 — Mutual inductance between pairs of parallel wires in terms of value for Ma at 



one kilocycle. 



The frequency characteristics of Ma and Mb for individual pair 

 combinations are about the same as shown on Fig. 10, although there 

 are occasional differences such as a positive value of Alb or a change in 

 sign in Ma or Mb at some frequency. Values for pairs in the outside 

 layer did not appear to be much affected by eddy currents in the 

 sheath. As in the case of measurements on parallel wires in space the 

 values of Ma and Alb are very small. For example, between two pairs 



