Gary,
All of this is tainted by politics. Not to say that the AOPA letter isn't honest and genuine, but since the Obama Administration has made itself the "we love trains, we hate planes" Oval Office (and really it's the President himself who has this prejudice), it's tough to separate general aviation's general angst from independent engineering analysis. I notice that the aviation industry's long-standing newspaper of record, "Aviation Week & Space Technology," has been much more circumspect in their concerns over LightSquared, at least AFTER LightSquared agreed to abandon the frequency band closest to GPS frequencies.
By the way, this is the first time in my experience following NavList messages that a threat to GPS has not been celebrated as a window of opportunity for celestial navigation experts. But times change!
:)
-FER
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