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I will post a long note on I/Q demodulation including my experiences implementing it experimentally for a research project at Zenith in the 80's if anyone is interested. (Will take me a while to write it). Basically, the NTSC system uses I/Q axes of chroma modulation so that the I channel (orange/cyan color differences) can have wider bandwidth to preserve those colors in small details. I can give you a longer explanation about why it was chosen and why it wasn't very practical.
Yes, RCA did produce one chassis later on that used I/Q, but the extra bandwidth was used at only a low amplitude (I think because of practical difficulties in the IF design) and did not really enhance the color detail much.
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