The port of Long Beach CA was jammed wrt GPS for several months by a malfunctioning 29.95 TV preamplifier on a boat.
GPS was completely unusable when this unsuspecting guy was watching TV on his boat. He had quite the surprise when the coasties with guns showed up. The fact is civillian GPS Is trivial to jam and jammers can be bought ‘under the counter’ at any truckstop along with illlegal linear amplifiers. On Aug 30, 2018, at 12:58 PM, Peter Laws <pla...@gmail.com> wrote: On Mon, Aug 13, 2018 at 8:52 AM Peter Laws <pla...@gmail.com> wrote: > I have yet to hear anyone make a case for retaining the HF system that > isn't backed by nostalgia. Still looking for this. Most of the "OMG IF WWV GOES AWAY MILLIONS WILL DIE" posts (elsewhere, not here ... quite ...) are the type of hysteria that is usually reserved for, I don't know, the EMP folks. :-) > As for solar flares taking out the various GNSSs ... wouldn't a solar > flare only take out the vehicles that were on the "sunny" side of the > Earth? Wouldn't the (approximately) half of the SVs that are in the > Earth's shadow be unaffected? Serious technical question - I have no > idea. One of the responses to my initial message pointed out that the effects of solar flares and CMEs take a while to get from Sol to Sol III and don't arrive all at once, so potentially all GNSS spacecraft could be affected. Since then, I've been poking around for papers on the effect (observed, potential, theoretical) of these events on the Navstar or other GNSS constellations but am not having much luck. I assume it's because I'm not putting the right magic incantation into the google machine. Anyone got some cites? Looking for the effect of solar flares and CMEs on the spacecraft themselves and not how the GNSSs can be used to measure the effects on the ionosphere, etc (those seem plentiful). IOW, I'm curious about the resiliency of the systems to solar events. I did note that at the time of the 1989 solar event that took out a lot of Hydro Quebec's grid, only the "Block I" experimental GPS "SVs" were in orbit. Well, maybe a couple of the later ones - the operational constellation started launching about a month before that flare. As I said initially, I'll be sad if WWV* goes away but it won't affect my life in any measurable way that I can see. I mean, other than the mantle clock slowly losing time. -- Peter Laws | N5UWY | plaws plaws net | Travel by Train! _______________________________________________ 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.