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... reminds me of a comment I think John Denker
made some weeks ago - about equipment to dig out signal from the noise.
At that time, I thought he was somewhat overstating the case for the GPS
for example:
it is a given that commercial GPSs can lock functionally with a signal plus
noise at least as big as -170dBm and a low noise input amplifier can hardly
get much better than 3microvolt.Hertz.
The question of what -170dBm is meant to be compared to is another point.
Of course the answer is 1 milliwatt
So it all depends on how much instantaneous bandwidth that receiver is
using - not a lot, I don't suppose.