Loran C not dead:

Ron Natalie wrote:
wrote:


GPS satellites are not in geosynchronous orbit and it is trivially
easy to jam GPS.

Correct on the geosynchronous, typing faster than the brain.
It's not trivially easy to jam GPS. Possible yes, but not exactly
trivial.

I'm afraid it is pretty trivial.

The signal strength of the GPS satellites is quite low.

It doesn't take much of a transmitter to overload the receiver front
end of every GPS for quite a distance.

A physically small transmitter hung from a balloon could wipe out all
GPS in a high traffic area such as LA or New York for days.


It is a lot more difficult to jam Loran effectively over a wide area.

Yeah, it juts takes a thunderstorm.

Apples and oranges; GPS is also subject to interruption from natural
causes and the subject was intentional jamming.

Loran is more difficult to jam because the transmitted power levels
are in the kilowatt to megawatt range and the physical size of
an effective transmitter antenna even with loading is huge.

While building a megawatt transmitter and antenna for it isn't
technically difficult, it would be trivial to find it and shut it
down.

--
Jim Pennino

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