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Those references state that the FCC specified subcarrier frequency as
3579545.00 Hz, which is true, but they also specified a tolerance of +/- 10 Hz.
For drop frame timing to match the wall clock precisely, the ratio of color to monochrome is exactly 1000/1001. This makes the monochrome vertical rate exactly 60 and the subcarrier frequency equal 3579545 + 5/11 Hz (3579545.454545...).
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Old TV literature, New York World's Fair, and other miscellany
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