CARRIER AND SIDE-BANDS IN RADIO TRANSMISSION 103 



phases in the modulated wave, and is proportional to the amplitude 

 of the side-band component. Hence amplitude distortion of the 

 reproduced wave can result only from unequal transmission of the 

 different component frequencies of the side-band. The change in 



AMPLITUDE-FREQUENCY AND PHASE-FREQUENCY 

 CHARACTERISTICS FOR BAND- PASS FILTER 



s-icr 3 



900 iooo leoo IAOO 16.00 ISOO 



Fig. 5 



the amplitude curve for the signal will be identical with that of the 

 side-band. The phase shift, ^ is independent of amplitude distor- 

 tion of the modulated wave. It is equal to the difference between 

 the phase lags of the side-band component and the carrier. Fortu- 



