Question 8-27C6

Noise refers to unwanted random electrical energy present in a radio system. When a signal from a target is weak—for example, from a small or distant target—its power level can be close to or even below the background noise level. This makes it difficult or impossible for the receiver to distinguish the actual target signal from the random noise, effectively "masking" the small target. A sufficient signal-to-noise ratio is crucial for reliable detection in RADAR and general radio communication. Larger targets typically produce stronger signals, meaning their signal power is well above the noise floor, making them much less susceptible to being masked by typical noise levels (A). Noise introduces randomness that reduces the *precision* of a bearing measurement, but it does not inherently *change* or systematically shift the actual indicated bearing (B). Lastly, noise is primarily a phenomenon affecting the *reception* of signals; it does not increase interference generated by a RADAR *transmitter* (D).