Cliff; You need to review ISO/IEC 13818-2 (MPEG-2 video) and S259M and S292M. The former is incorporated by reference in FCC rules. My take is that the FCC is silent on this, and one can use any encoding that creates the necessary bit streams. John Willkie -----Mensaje original----- De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En nombre de Cliff Benham Enviado el: Wednesday, January 14, 2009 5:56 PM Para: opendtv@xxxxxxxxxxxxx Asunto: [opendtv] Question about analog transmissions from stations also transmitting 8VSB... I'm assuming that all network programming is digital these days and that the analog versions stations transmit are from an NTSC output of an MPEG-2 demod. There may other ways ??? that are used to develop the analog signal too. The question is: Is the NTSC signal from an MPEG-2 decoder [or other ??? source] developed in the I and Q format or R-Y and B-Y? Further, is I and Q encoding still an FCC requirement, or has the rule been relaxed so that R-Y and B-Y encoding can be used? Thanks. ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line. ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.