Disrupting isn’t the same as turning off! As was found during a test over here, a number of systems rely upon GPS time signals and can happily revert to their own internal clock for a while if the GPS is off — but not if the GPS signal is disrupted. The primary network clock for the main broadband supplier in the country was an example.
Personally I’d prefer to fly in a plane where there’s an alternative that’s been tried and tested in the [OK, it seem unlikely at the moment] event that the GPS system gets fried. Andy > On 10 Jun 2016, at 22:56, Kevin - K4VD <[email protected]> wrote: > > Testing and practice all make sense but what isn't making sense about this > is that we're disrupting GPS. Lots of stuff other than military rely on GPS > and - just my humble opinion - It seems a little freaky that they are > testing commercial aircraft. > > Wouldn't as valid a test simply be to turn off the GPS receiver? I mean > testing for a power outage at a commercial data center doesn't require > turning off power to the city. > > It all kind of seems strange to me. > > Kev > > > On Fri, Jun 10, 2016 at 5:07 PM, Ron D'Eau Claire <[email protected]> wrote: > >> When I was servicing shipboard electronics systems in the 90's, one of my >> regular "charges" as a civilian contractor was the Naval Hospital ship USNS >> Mercy ported in San Francisco, CA. I went to sea on her several times to >> check/calibrate nav systems, radars, direction finders, GPS gear, etc. >> under >> operational conditions. >> >> On one trip I noticed officers on the grabbing sextants and heading out >> onto >> the bridge wings. I asked the Captain if the US Navy still used sextants to >> navigate in this day and age. He smiled and said, "If we go to war, most of >> that stuff up there (pointing to the sky) will be disabled in the first >> hour. My officers will know how to get us wherever we're needed without >> it!" >> >> >> 73, Ron AC7AC >> >> -----Original Message----- >> From: Elecraft [mailto:[email protected]] On Behalf Of >> brian >> Sent: Friday, June 10, 2016 1:50 PM >> To: [email protected] >> Subject: Re: [Elecraft] This will effect pilots and Hams throughout the >> Western US >> >> Related to this. The Naval Academy has started teaching Celestial >> Navigation again. It had been discontinued. >> >> The Coast Guard never discontinued it. >> >> I also understand the old surplussed 10 kW Collins HF transmitters are >> being >> reacquired by the military. Can teaching of CW be next? >> >> 73 de Brian/K3KO >> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
