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It has no effect on monochrome synch. The monochrome horizontal synch pulses contain a sample of the carrier used to detect and decode the color signal. That sample is called the burst, it is gated and used to synch the 3.58MHz reference osc. Tube era sets and some SS sets have an adjustable transformer used to bring the frequency of that osc. close enough for the osc. to synch to the burst. The phase difference between that osc. and the chroma signal determines hue of the color, and the amplitude of the chroma determines how saturated that color is. If the osc. is off in phase people will have purple faces, and if it is off in frequency you will get horizontal bars of RGB, or a constant tinted monochrome image.
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