uncorrelated noise adds as the square root of the sum of the squares
sqrt(V*V + V*V) = 1.4V or 3 dB gain.
This implies that if I am listening to a very weak signal close to the rx
noise floor (at least at my urban QTH this is rare and would only happen
on the higher bands), it would pay to activate the sub-receiver in
diversity mode even with the same antenna!
But wouldn't the benefit be purely the result of the psychoacoustical phase
difference between the two audio sources rather than amplitude when
activating the 2nd Rx?
With two correlated signals, it would seem that both noise *and* the desired
signal increase by the same amount (i.e., 6 dB). Likewise, with two
uncorrelated signals, both the noise and desired signal also increase by the
same amount (i.e., 3 dB) So, from a SNR standpoint, what is the benefit? I
can see where there may be a psychoacoustical phase benefit, but not of
amplitude.
Paul, W9AC
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