On a sunny day (22 Jul 2007 15:16:23 GMT) it happened Jim Yanik wrote in :
NTSC sync is -285.7 mv.
>Peak white is 714.3mv
>For a total of 1000mv P-P.
>black is 53.6 mv.
>blanking is 0v
>color burst is 285.6mv p-p
>
>I took these specs from a TEK TSG-90 manual.
>
>sync pulses are 4.7us wide,and equalizing pulses are 2.3us wide,and there's
>6 of them to a vertical sync pulse.
>
>that's for a clean NTSC signal out of a generator.
>Once it gets broadcast,it's very distorted,
Not so much really.
and inside a TV set,even moreso.
Some sets I have seen in the US would probably meet that definition, but normally it would be a nice signal.