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The chroma "checkerboard" is a fine pitch pattern (at 3.58MHz) that seems to drift upwards on the screen. 227.5 cycles per horizontal line. The amplitude of this checkerboard is higher in highly color saturated areas, and low to nothing in gray, white or black areas of the video image. Your monitors are probably wide bandwidth enough to show this checkerboard.
Haven't had a chance to dig into other boxes to see if the chroma is easily intercepted or not. Some boxes may create the composite NTSC signal inside a big digital chip, in which case I can't get at it.
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