Some interesting replies in this string.
Jerry and Faye, the number of bits provided by the A to D determines the
minimum signal level. More bits means more sensitivity. I believe the higher
end SDR (not the dongles for $17!) use 16 bit A to Ds. Dynamic range is also
important. Lots of information available on line.
But you are right. There is a practical limit based on noise.
Tree, regarding ft8, Joe, W4TV's answer is a fine explanation. Its a
combination, for a SDR, of the number of A to D bits and the capabilities of
the software created by Joe Taylor. The shorter answer is, the signals are
actually there....
Isn't technology great??!! So much to learn. And I may have to relearn some
stuff should I have gotten some of the above wrong
Ron N4XD
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