496 



BELL SYSTEM TECHNICAL JOURNAL 



amplitude which may be present due to fading or modulation. This 

 reconditioned carrier is then used for obtaining automatic frequency 

 control of the beating oscillator and synchronization of the local 



Fig. 4 — Fronl view of single-sideband receiver. 



carrier oscillator, or it may be applied directly to the second detector 

 for demodulation purposes. 



By using an intermediate frequency band of moderate width, an 

 ordinary double-detection receiver for double-sideband operation 



