SPECTRUM ANALYSIS OF WAVES 



375 



A comparison of the spectra on Figs. 8 and 9 shows that the sidebands 

 have the same general pattern. However comparative sidebands are not 



40 50 60 70 



MODULATION IN PER CENT 



Fig. 8 — Spectrum of pulse position modulated wave for case where the carrier frequency 

 C is 10 times the signal frequency v. 



quite equal in the two cases. In fact comparable upper and lower side- 

 bands in the case of the pulse modulated wave shown on Fig. 8 are not 



