848 THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1953 



w) 2 



S 



z 

 < 



X 

 u 

 _ -1 



to 

 3-3 



2 3 4 5 6 7 8 

 FREQUENCY IN MEGACYCLES PER SECOND 



Fig. 3 — Regulation shapes and ranges for tube aging (miS) and repeater tem- 

 perature (T). The curves given can occur as either gain or loss and apply to 30 

 repeaters. 



4. Provide satisfactory equalization of in-band delay distortion due 

 to out-band gain change. 



5. Each equalizer controlled by a single variable resistance element. 



6. The desired performance to be realized in 75-ohm circuits. 



Dynamic Equalizer Design 



The design used is the structure commonly known as the Bode Regu- 

 lator, • and shown in block schematic form in Fig. 5. An ideal regulating 



4 6 8 10 12 14 



FREQUENCY IN MEGACYCLES PER SECOND 



Fig. 4 — Match to out-band gain change to reduce in-l)M,n<l delay distortion. 



