Tayloe Dan-P26412 wrote:
However, if the situation is a weak signal situation where
the receiver noise floor is at least partially masking
the desired signal, we have a different situation. Band
noise and stations on the band will both be correlated coming
out of both receivers and thus get a 6 dB improvement. On
the other hand, the internal noise produced in each receiver
is independent and thus uncorrelated. While correlated
signals add voltage wise (V + V = 2V or 6 dB gain),
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!
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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