LO.IPED LlXr.S .INP COMPENS.iriXC NETWORKS 



447 



itself, aiTording to equations (4) and (5). Hence the two types of 

 networks will sometimes be distinguished as impedance type and 

 .idmittance type. More s|)erifirally, the siinuialiiiK networks of the 

 two tyytes will lie distinguished as impedante-simuiators and ad- 

 mittanre-simulators, respeitisely ; and the compensating networks as 

 reactance-compensators and susceptance-comiu-nsators, respectively. 

 By being built out to the recjuisite extent, either type of network 

 evidently can be employed with a loaded line terminating at any 

 [loint in cither a section or a load: but, depending on such termina- 

 tion, one tyi>e will reciuire less building-out than the other, and hence 

 will be somewhat preferable on that score. For instance, fcjr simu- 

 lating the impedance of a loaded line terminating at mid-section 

 (a = 0.5), a basic network of the fractional-section type of termina- 

 tion will require less building-out than one of the fractional-load 

 type of termination. 



The Basic Xeluvrks 



The \arious basic networks mentioned will now be described briefly, 

 by aid of circuit diagrams which show the forms of the networks 

 and which include explicit design-formulas for the proportioning. 

 Mutually corresponding networks of inverse types will be described 

 together or in sequence, in order to exhibit clearly their correlation. 



In the design-formulas the requisite values for the network-elements 

 will be expressed in terms of the load-inductance L' and the section- 

 capacity Cof the given loaded line; but when desired they can instead 

 be readily expressed in terms of the nominal impedance k and critical 

 frequency /'i. by means of the relations 



L' = k,wf„ 



C=\,vkfc. 



Of course, the design-formulas involve also the relali\c- UTininatinns 

 a and a' . 



Figs. 12 and 13 show two rather simple nclworks vvliicii simiii.ile 

 very well, over most of the transmitting band, the a-section cliaracter- 



' wvvwvww 1 



L,-(i-a)t, 



KIk. n - lni(H?dance- Simulator for a 



Lciiled Line Terminating at cr-Section, 



with <r in the NeighlxjrhocxJ of_0.2 



F-'ig. 1.' — .Vlniitt.incf -Sirnulalor for a 



I.oiiclecl l.inc TcTMiinatinK at u'-l-oad, 



with a' in the .\oighlK)rhootl of 0.2 



