INDUCTIVE LOADING FOR TELEPHONE FACILITIES 



193 



1 to 3% at 1000 cycles on 19 ga. cables. At the top voice-frequencies, the 

 attenuation increments are less than twice as large as the 1-kc increments. 

 In 50-mile repeater sections, the resulting increases in the bare-line attenua- 

 tion are of the order of 0.2 to 0.4 db at 1000 cycles depending on the type of 

 loading and much of this increment-loss usually can be recovered by raising 



Fig. 13— Potting assembly methods— medium and large size complements of MF- 

 type units. For placement in cylindrical, thin steel, casings. 



the repeater gains. The stability of residual inductance is as good as that in 

 the M-type loading units. 



The unpaired hysteresis effects, above mentioned, are accompanied by 

 increased non-linear distortion, including telegraph-flutter effects. Also the 

 smaller coils are somewhat more susceptible to changes in inductance and 

 effective resistance when the circuits in which they are used have steady 

 currents superposed upon them during talking intervals. 



Additional information regarding the smallest loading units is included 



