454 BELL SYSTEM TECHNICAL JOURNAL 



When tlie nominal impedances of the two lines are unequal, ad- 

 justment in that respect can he made by means of a transformer of 

 suitable ratio. 



Some other uses for the compensators are as follows: (a) to properK- 

 connect a loaded ine to a repeater system whose impedance is nearh- 

 constant resistance; (b) to connect a loaded line type of filter (low-pass 

 filter) to an amplifying element whose impedance is nearly constant 

 resistance; (c) to connect a loaded line to terminal apparatus whose 

 impedance is nearly constant resistance; (d) to convert the impedance 

 of a loaded line to that of the corresponding smooth line and thereby 

 enable it to be simulated (or to be balanced) by a smooth-line type 

 of simulating network; (e) to convert the impedance of a smooth 

 line to that of a loaded line and thereby enable it to be simulated 

 (or to be balanced) by a loaded-line type of simulating network; (f) 

 to neutralize the characteristic reactance of an approximately non- 

 dissipative loaded line, thereby enabling the resulting nearly pure 

 resistance impedance to be closely simulated (or to be closely bal- 

 anced) by the network (Fig. 18) simulating the characteristic resist- 

 ance of the loaded line; or — though somewhat less closely — by a mere 

 resistance element; (g) to neutralize the characteristic susceptance of 

 an approximately non-dissipati\e loaded line, thereby enabling the 

 resulting nearly pure conductance admittance to be closely simulated 

 (or to be closely balanced) by the network (Fig. 19) simulating the 

 characteristic conductance of the loaded line; or — though somewhat 

 less closely — by a mere conductance element. 



In applications (a), (b), (c) the irregularity at the junction can be 

 still further reduced by the addition of an excess simulator for simu- 

 lating the excess impedance of the loaded line. 



APPENDIX A 



The Transmitting and the Attenuating Bands of a Non-Dissipa- 

 TivE Loaded Link with Distributed Inductance 



This Appendix contains the deri\ations of the formulas in Part III 

 pertaining to the disposition of the transmitting and the attenuating 

 bands; and also .several alternative formulas; it outlines six graphical 

 methods for studying the bands; and it discusses, more compre- 

 hensively than in the body of the paper, the salient properties 

 of the bands and the effects produced by varying certain of the 

 parameters. 



