AWR Gain RNAV
The gain of a radar is a measurement of how much energy is focussed in a particular direction - the higher the gain, the narrower the beam (meaning fewer targets detected) but the further it will go, as it is more focussed. Higher gain can enable you to detect the edges of objects more precisely as well as objects in radar shadow. Somewhat erroneously, this higher focus is referred to as "sensitivity" in the exam and you are encouraged to comment on this question should you see it.
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What does the gain switch on an AWR alter?