Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

1278 FREQUENCY MODULATION, Volume Ithe picture and results in synchronization difficulties when frequencymodulation is used on video or synchronizing signals.Since field tests have demonstrated the possibility of encounteringdistortion due to multipath propagation even though the distance fromthe transmitter to the receiver is relatively short, a theoretical andexperimental study was made to determine the factors contributing tothis type of distortion. It is the purpose of this paper to present theresults of this investigation.Theoretical ConsiderationsSuppose that one frequency-modulated wave is delayed with respectto the second by a time interval t because of two-path transmission.The equations for the instantaneous voltages of the two waves arere 1= Ex sin -i at -\— sin 2-irjj.tyDl(1)e 2= E 2 sin < trD}L m 1 + X COS {z COS (2-TTixt — 7r/ui ) +