CARRIER AND SIDE-BANDS IN RADIO TRANSMISSION 105 



shifted in phase relative to the carrier by the same amount; that is 

 to say, for every value of q considered separately, 



Then 



(/>+ — c/> = 4> — 4>— == o. 



R = 2 B B± 



* = 5. 



(19) 

 (20) 



(21) 

 (22) 



The same considerations as to distortion of the side-band apply 

 here as for the single side-band. There is one point, however, of 

 some practical significance. As is evident from Fig. 6, the charac- 



AMPLITUDE- FREQUENCY AND PHASE FREQUENCY 

 CHARACTERISTICS OF SIMPLE RESONANT CIRCUIT. 



8 



Fig. 6 



teristics of a resonant circuit come very close to satisfying these 

 symmetrical conditions if the carrier coincides with its resonance 

 frequency. Its effect on the amplitude and phase curves of the re- 

 produced signal may therefore be derived independently from the 

 amplitude and phase curves of the tuned circuit. If, however, the 



