Query on Test Pattern Generator

[W.B.]

Originally Posted by Penthode

I am not sure why we are discussing the reference to a 13.5MHz clock. The mid eighties was before ITU R 601 sampling. The clock reference in the generators would have been 4fsc or 4X 3.58 = 14.3 MHz.

Or more specifically, 14.31818182 . . . MHz. In this case, the bars in question would have been 104 in width (except the first which in some applications stood at 106). However, with very few exceptions, the screencaps that are out there are not even done in this sample rate. Nor in the 17.734475 MHz (4 x 4.43361875) that was the composite sample rate for PAL standard. But with picture width at 754 pixels in the 14.31818182 . . . MHz sample clock, the horizontal timing of the top of the bars in this layout as on that WTVS screencap (and on those YouTube clips) would have been:
106 + 104 + 104 + 104 + 104 + 104 + 104 + 24 (black)
The lower portion would have been, with PLUGE added:
130 + 132 + 130 + 52 + 52 + 78 + 52 + 128
The vertical timing, unless I'm mistaken, would've been 21-200 and 263-442 for the top part, and 201-263 and 443-525 for the bottom.