On 8/19/15 10:12 PM, Hal Murray wrote:
[email protected] said:
I think that Menlo Park is somewhat under 300 NM (nautical miles) from China
Lake (depending on exactly where the test was located), and the expected
interference range was about 252 NM. So you might have been at the edge of
the affected area. See: http://www.navcen.uscg.gov/pdf/gps/gpsnotices/
GPS_Interference.pdf
On the other hand, there is a 4000 m tall mountain range (Sierra Nevada)
and a lot of other stuff between the two. I'm pretty sure that the
radius of the circle is for *airborne* platforms, where the jammers are
in line of sight. (radar horizon at 30,000 ft is about 250 miles)
It would be truly amazing to get L-band propagation from China Lake to
Menlo Park.
I'd go for the "trucker with a jammer" scenario
http://gpsworld.com/personal-privacy-jammers-12837/
or "malfunctioning equipment oscillating in band" scenario (like the
Monterey Bay event)
http://gpsworld.com/the-hunt-rfi/
Thanks. My measurements on Google maps are are close to 250 miles. That's
to the town rather than the boonies out back.
My antennas are all in poor locations (indoors) rather than good locations so
I'm probably more sensitive than some of their target users.
What's the BNM column on that chart?
What sort of gear would I need to detect a local jammer?
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