-=> Quoting Tom Walker to Charles Angelich <=-

 TW> As a review NTSC was affectionatly called "Never The Same Color"
 TW> becasue the way colors drifted. That was mostly due to poor control
 TW> by the Broadcast Engineer but part of that was equipment limitations.
 TW> Most of the Prolbems has been solved by improved equipment in the
 TW> interveining years.

 The standard for the two color signals is 1.5MHz for the
 I signal and 0.5 MHz for the Q signal.  TV sets up to
 about 1964 demodulated on those two 90ø signals.  The
 I and Q signals then underwent further processing to
 come up with R-Y, B-Y and G-Y signal for the pic tube.

 Eventually manufacturers learned to demodulate on the
 R-Y axis and the B-Y axis (both 0.5 MHz) and combine
 them in such a fashion to get a G-Y signal.

 Note that now the viewer has 1 MHz less color signal
 or information (quality, if you want to call it that).

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