Effect of Transmitter Characteristics on NTSC Color Television Signals

The radiated wave form of a fully-equalized color television transmitter is shown in the amplitude range which includes the subcarrier burst and the sync pulses. Three cases of saturated color bar transmission corresponding to different depths of modulation of the RF carrier are analyzed. It is shown that both the subcarrier and the luminance components are altered by the partial suppression of one sideband even in the idealized system. However, saturated colors are not usually present in average color scenes and the current monochrome standards for white level may be adhered to in color transmission. Several sources of incidental phase shift of the subcarrier in the transmitter as a function of the modulation depth are pointed out. Measurement procedures for the determination of incidental phase shift and differential gainare illustrated byactual oscillograms.