What bearing or force does ANSI/SMPTE 170M-1994 [SMPTE 1267, April 19, 1996] have on this discussion?
Mark Schubin wrote:
It was published in IETS-1 in November 1977. TTFN, Mark Barry Brown wrote:Mark,Almost but may not be not completely right - There was no RS-170A standard published by EIA, but I'm almost positive the RS-170A waveform spec was published. I know because I spent some years (don't remember how long) working on this drawing.Barry Brown On Feb 17, 2007, at 2:22 PM, Mark Schubin wrote:John Willkie wrote:Now, you've got me confused, Mark.It's an interesting quirk of fate. NTC-7 is real. RS-250B and EIA-250C are real.There was never any such standard as RS-170A. There certainly was an RS-170 for monochrome TV, and there is agreement on what RS-170A would have been, had there ever been one. But broadcasters did not want to create an RS-170A until they were ready for it, lest the FCC adopt it as part of the rules and they be fined for violating them.So, instead, there is EIA IETS-1 (the first, and possibly only, Industrial Electronics Tentative Standard), which specifies the subcarrier-to-horizontal-sync relationship that everyone thinks comes from the non-existent RS-170A.TTFN, Mark
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