[opendtv] Re: Food for thought
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 17 Feb 2007 12:05:13 -0800
Okay, then I take it back. EVERYTHING is in flux, with the possible
exception of monochrome NTSC. Testing and measurement gear gets more
precise over time (as new devices are sold), reception gear gets better, and
new issues are identified.
Non-existent RS-170a is very interesting in light of the fact that various
manufacturers have been selling 'RS-170a' compliant gear for more than 20
years.
John Willkie
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
> On Behalf Of Mark Schubin
> Sent: Saturday, February 17, 2007 11:22 AM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: Food for thought
>
> 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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