Hi The same sort of massive solar flare that fiddles with sat systems also makes a mess of HF and VLF systems. You have a high level of correlation in the impact. That makes them a poor “backup” in this case.
Bob > On Aug 29, 2018, at 7:52 PM, Scott McGrath <scmcgr...@gmail.com> wrote: > > Excellent point on LEGAL time, The problem is as always is GPS is the new > shiny object. > > You mentioned earth based hostile actors. But a really large solar flare or > CME has the potential to take out or severely degrade ALL the GNSS systems. > > Something on the order of the ‘Carrington Event’ or the flare in 1989 which > took out power to much of Canada. > > Things like this are why we need terrestrial time distribution systems like > eLORAN which by its nature is resistant to both man made and natural > interference. > > On Aug 29, 2018, at 7:33 PM, Perry Sandeen via time-nuts > <time-nuts@lists.febo.com> wrote: > > Yo Dudes! > WWV and all its variations distribute what in the USA is the legal standard > of time (from USNO) and frequency (NIST). > If one is running a freq cal service IIRC it is a legal requirement to be > able to have traceability to WWV. > > If one was to rely on other sources, one has no guarantee that it 1. It is as > accurate as claimed and 2. It can't be *diddled* with accidentally or > deliberately. > Although GPSDO's are very good and popular, they come from satellites that > are vulnerable to damage from earth based resources. > When your time and frequency standard(s) is under control on your own > physical territory then they stand or fail on their own. > After the atom bombing of Hiroshima and Nagasaki, one of the major inventors > of the bomb (I don't remember who) went to see US president Harry Truman and > essentially told him that the scientists who developed the bomb should have a > say of how or when it should be used. > Truman is reported to have said for him to leave his office and told an aid > that was responsible for his schedule to "never in hell let that (or any > other) scientist come to his office to influence American defense policy." > Considering its status from both a scientific and political perspective, > IMNSHO it will go on as before. > To explain the political. No government official wants to see China or the > Russian federation tell the world quote: See, the USA can't be trusted for > something as important and simple as frequency and time. However we are your > friends who you can trust. Unquote. > Regards, > > > > > > This is a case of practical use of WWV albeit over 50 years a go the > fundamentals are still valid today. > At Karamursel Air station TUSLOG 234 I was assigned to the base receiver > site. Our base had to purposes. to > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
