On Sun, 09 Jul 2006 23:20:39 GMT, Owen Duffy wrote:


mean(delta-T)= (Beta * Tn) /( delta-v * t)^0.5

where delta-T is the minimum detectable signal; Beta is a constant of
proportionality that depends on the receiver and is usually in the
range 1 to 2; Tn is the receiving system noise temperature; delta-v is
the pre-detection receiver bandwidth; and t is the post detection
integration time constant.


I should have mentioned that I don't understand why the Beta factor
would vary from receiver to receiver. It seems that it was determined
empirically. If the indicating instrument was a meter pointer observed
by a person, perhaps Beta might have captured the observer effects
more than the equipment.

Owen
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