If you read article the City of London basically has a GPS denial 10-15 minutes daily this covers a couple square miles
A lot of people are under the misconception that the spy shop jammers only do a few feet. Reality is most of them are 100-500 mw and blank out at least a square mile A suitcase sized unit at a high elevation could deny hundreds of square miles Sent from my iPhone On Jul 30, 2013, at 11:52 AM, Chris Albertson <albertson.ch...@gmail.com> wrote: > It is easy to jam a simple GPS receiver. Harder to jam a military > receiver. In a conflict a jammer of any kind is pretty much a beacon that > says "here I am". It is one of the bigger problems of jamming, you have to > radiate RF. So either you have to be very close to your target or have a > powerful jammer. > > Simple civilian jammers are easy, like the one a truck driver might use to > prevent his boss from tracking him, It only has to cover a few feet. But > try and jam a jet flying at 40,000 feet or a navel carrier task force. > > > On Tue, Jul 30, 2013 at 5:50 AM, Scott McGrath <scmcgr...@gmail.com> wrote: > >> Any competent engineer could have told the powers that be that a satellite >> system based in LEO has a relatively high risk profile from the >> Universe/hostile activity/spoofing and jamming >> >> Yes GPS is/was oversold. >> >> Trouble is Clarkes law applies here (any sufficiently advanced technology >> is indistinguishable from magic). And this applies double to the >> technological illiterates in DC >> >> See Sen 'Tubes' Stevens for the canonical example >> >> Sent from my iPhone >> >> On Jul 29, 2013, at 12:46 PM, "J. Forster" <j...@quikus.com> wrote: >> >>> It seems to me that GPS has been oversold as the be all, end all system >>> that made all other systems obsolete and GPS has become all but an >>> indespensible utility. >>> >>> Reports like this, could well be used to promote a backup, like LORAN or >>> eLORAN, just as public buildings have backup generators. >>> >>> YMMV, >>> >>> -John >>> >>> ================== >>> >>> >> http://www.economist.com/news/international/21582288-satellite-positioning-data-are-vitalbut-signal-surprisingly-easy-disrupt-out?fsrc=scn/tw/te/pe/outofsight >>>> >>>> -Bill >>>> >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.