494 



BELL SYSTEM TECHNICAL JOURNAL 



section is put in or taken out of the circuit. By properly combining 

 these sections it is seen that a continuous range from to 325 degrees 

 is obtainable. 



The sections were designed from the formulae of Appendix IV so as 

 to give the desired individual linear phase characteristics shown in 

 Fig. 22. It need only be stated that the data taken from the phase 



210 



zoo 



190 

 ISO 



no 



160 

 150 



lao 



^,30 

 ^ IZO 



I no - 



§ 90 



so 



70 



60 



JO 



40 



30 



20 ■ 



10. - 







80 and, I60-J)egree Sections 

 ..Cs 



ZOand 40-J)eQree Sections 



■Cs 



Variable and lODegree Sections 



10 



ZO 30 40 50 



Thequency (hiilocycles per second) 



Fig. 22 — Sections of variable phase corrector and their phase characteristics used in 

 the transatlantic telephone system. 



characteristics in the one-parameter sections were those at 50, in the 

 two-parameter sections those at 50 and 65, and in the three-parameter 

 composite sections those at 50, 57.5, and 65 kilocycles per second. The 

 elements for the variable section in Fig. 22 are continuously variable 

 and have their magnitudes given in terms of the variable phase constant 

 B at 50 kilocycles per second as 



