460 



BELL SYSTEM TECHNICAL JOURNAL 



+12 



+11 



+10 



o +9 

 _i 

 ill 

 (D 



UJ 



Q -18 



-19 



-20 



-21 



10 



100 

 FREQUENCY 



1,000 10,000 



IN CYCLES PER SECOND 



100.000 



175 



150 



125 



100 



^75 



^50 



25 







-25- 



-50 



B 



100 



FREQUENCY 



1,000 10,000 



IN CYCLES PER SECOND 



100,000 



175 

 150 

 125 

 100 



-75 



I 

 O 50 



25 







-25 



-50 



10 



100 

 FREQUENCY 



1,000 10,000 



IN CYCLES PER SECOND 



100,000 



Fig. 9 — A. Voltage ratio characteristics of VV-TSTQ input transformer and \V-7880 

 output transformers, each connected between its rated impedance. B. Impedance 

 characteristic of W-7880 output transformer with 1765 ohm resistance load. C. 

 Impedance characteristic of \V-7879 input transformer with 20 mmf. capacity load. 



