Why do television stations transmit a YIQ color signal to an RGB phosphor television?

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Why do television stations transmit a YIQ color signal to an RGB phosphor television?



Why is this used for television broadcasting?
1. Allows compatibility with black and white televisions (Y Signal)
2. Allows reduced bandwidth: Luminance signal sent at higher bandwidth. Y = 4.2 MHz, I = 1.3 MHz Q =0.5 MHz

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