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Stated as a rational number rather than a repeating decimal, the color subcarrier frequency is
3579545 + 5/11 Hz
5/11 = 0.45454545...
This comes about because of the prime factors of 455. 455 was chosen instead of some close possible numbers because it is the product of some fairly small prime numbers. Each counter stage dividing by a fairly small number meant that the tube frequency dividers of the time were less likely to drift out of tolerance enough to cause a wrong count.
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Last edited by old_tv_nut; 11-24-2023 at 10:43 AM.
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