190 



BELL SYSTEM TECHNICAL JOURNAL 



■MSu — I 



•ATTENUATION SECTIONS 



-DELAY SECTIOf.'S- 



Fig. 10 — Schematic of audio-frequency equalizer. 



Fig. 11 — Photograph of audio-frequency equalizer. 



Carrier-Frequency Equalizer 



The critical frequencies of the carrier-frequency equaUzer are located at 

 318, 610 and 890 cycles on an audio basis. Since the carrier is at 88 kc 



