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Wa2wise, thanks for digging up those numbers on bandwidth. For vertical edges/lines, the resolution would be similar to the capability of a notch filter (non-comb-filter) TV set.
Regarding the needle pull/push, I think it firstly improved the horizontal timing stability; and secondly reduced the color phase/frequency error, but not enough to make a signal suitable for the narrow color loop in a TV. The final color carrier correction had to come from a fast burst-referenced PLL on the 5.11 MHz, similar to that in a VHS machine except for the particular frequency used, right?
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