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Old 3-Dec-2013, 12:40 AM   #3
Junior Member
Join Date: Nov 2013
Posts: 8
Missing Details

Thanks for the reply Gmast. I have seen this thread. In particular:

Scenario 3 (rooftop antenna followed by pre-amp)


(Note that his scenario assumes that the gain of the pre-amp is more than enough to overcome the losses of the cable, splitter, and receiver noise figure that come after it in the chain.)

the example suggests for preamp gain that is "more than enough", all of the above losses are cancelled out. It is the "more than enough" part I am interested in getting more details on.

Is the degree to which these losses + NF are overcome a function of the preamp gain? If so what is the formula? In other words if the preamp gain exactly equaled the referenced losses + receiver NF, would the net NF exactly equal to the preamp NF? If not what is the formula that determines how different it would be?
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