Signal strength. LORAN transmitters put out multi-hundred KW to MegaWatt class pulses. Wiki has a list. I would think a GPS bird puts out less than 100 Watts CW. Also, GPS birds are a LOT farther away, especially measured in wavelengths (much higher path loss)
Those factors combine to make a huge difference in received power. It could well be over 100 dB. >From what I've heard a GPS jammer smaller than a deck of playing cards can easily wipe out GPS w/in a mile or more for a week or longer. -John ============ > I've read and heard from this forum as well as a number of other sources > that GPS can be easily jammed. What makes GPS so vulnerable? How can it > be > jammed? > > -- > David > masondg44 at comcast dot net > > > From: Francesco Ledda <frle...@verizon.net> > Subject: Re: [time-nuts] The Demise of LORAN (was Re: Reference > oscillator accuracy) > To: Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Cc: "time-nuts@febo.com" <time-nuts@febo.com> > Message-ID: <e3e7bc70-4087-4e64-a713-61e8524b5...@verizon.net> > Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes > > AOPA is pushing congress to repristinate funding for LORAN. General > aviation is probably the heaviest user on this Nav system. The > aviation user community would love to see Nav systems with integrated > LORAN and GPS capabilty, but the industry has done little in this > area, due to lack of government commitment to LORAN. The FAA knows the > GPS can be easily jammed, but has done nothing do push LORAN as the > GPS backup system. > > Sent from my iPhone > > > _______________________________________________ > 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.
