ve3jf said:The old mask, as defined in § 73.317, was effectively replaced when the FCC adopted the NRSC-5 standard...
Check again ... the FCC has not adopted the NRSC-5 standard.
There was a round of public comment on NRSC-5 in the Summer of 2005, but nothing ever came of it. In the Second Report and Order (Spring 2007) see Paragraph 12, which says in part, "our consideration of the NRSC-5 IBOC standards is continuing." Earlier this week, Media Bureau told stations to "certif[y] that, except for the digital ERP, the IBOC facilities conform to the iBiquity specifications" -- no mention of either NRSC-5 or FCC specifications. http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-10-866A1.pdf One can only imagine that they are referring to Appendix B of the First Report and Order. http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-02-286A2.pdf Table A-3 sets the subcarrier power levels, but this document also requires use of the PAC codec!
I will agree that § 73.317 was effectively replaced for hybrid digital transmission by § 73.404(a), but this belies the point. The recent amendment to § 73.404(a) was adopted, among other reasons, because it was supposedly consistent with § 73.317. This rational, as given in the Order, was based on false information -- the elevated power levels (and even the original -20 dBc power level) do NOT fall within the limits prescribed by § 73.317.
See my recent filings on 99-325 for more of the story.
- Jonathan