This probably belongs more in the NTP WG and/or hackers than here since it sounds like you are looking for enhancements to the NTP model.
Danny Max Power wrote: > In North America, the FM RDS time service is of very low quality. > In Europe (I understand) this is not the case with RDS. > Stations running RDS should be mandated by law to provide a quality > service -- based on transmitter power and coverage area. > Over time RDS's time service should be uniform. > DRM (on MW and SW) time service is of a lower quality than RDS -- but could > be upgraded with a specialized "80 bit" NTP-UNIX time packet. > > ATSC and DVB-T (& DVB-H/M) need a uniform ~"80 bit"...~"128 bit" time packet > service that is well thought out. > Futureproofing is important, so probably 128 bits or more is preferable. > > LF time services are OK, and are necessary over large transnational > regions -- like Sub Saharan Africa, Australasia and South America ... but > any new LF service needs to be more technologically advanced than WWVB, MSF > or DCF77 and its Swiss twin. In these regions 10 LF frequencies need to be > allocated, but the signal to be transmitted needs to be more modern than > WWVB or DCF77 -- maybe using some form of low complexity PSK or low > complexity QAM and 240 hz to 480 hz of bandwidth. The signal must be > futureproofed -- as above. > > I wish I had all of the email addresses of the Canadian National Research > Council -- so that I could email them my CHU upgrade proposal at > * http://CBC.am/CHU.htm > * This proposal probably, if implemented -- would require a signal upgrade > to account for 2 transmitters on all of the frequencies used. > * A properly designed signal upgrade could make CHU a more powerful > [technological design] than WWV[H] -- but this would probably require 2 or 3 > years of experimentation. I would love to see support for high speed ECC > polytone and MD63 (MD?) with its Walsh coding. > >>>> ATSC time is always late ? >>> ======================== >>> ATSC and DVB-T (DVB in general) are devoid of a 64 bit (or 80 bit) clock >>> packet (based on NTP and 'Unix Time'). >>> >>> For people to be forced to rely upon GNSS (Glonass, GPS, Galileo) for a >>> time >>> signal is rather immoral when TV transmitters (and radio too, remember >>> RDS) >>> pump out many megawatts of signal each day (globally). >> ///////////////////////////////////////////////// >> Immoral? That's a bit strong, innit? You don't NEED to rely on >> satellites for >> time signals. There are many LF radio time signals, such as WWV, WWVB, >> WWVH, >> CHU, MSF, DCF77, and others. CDMA cell phone towers broadcast a time >> signal. > > > _______________________________________________ > questions mailing list > [email protected] > https://lists.ntp.isc.org/mailman/listinfo/questions > _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
