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A couple more notes:
1) The change of scan rates by the ratio 1000/1001 was still within the looser original tolerance for monochrome. Changing the audio carrier frequency offset from 4.500 Mhz to (4.500)(1001/1000) would have been outside the original audio tolerance.
2) By the time that analog cable began messing up the burst on/off issue, all sources, color or monochrome, were running at color scan rates.
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