VARIABLE EQUALIZERS 



235 



-y^ 



aRp 

 2(a2-,)< 



-wv- 



aRo 



aRf 



(a2-i) 



e'^ = a 



0.5 1.0 



1.5 2.0 2.5 



Pig 3_The simplest type of symmetrical variable equalizer 



3.0 3.5 



Fig. 4 — Adjustment of the variable characteri.stic by the addition 

 of an auxiliary network. 



