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Not all radar echoes are produced by valid targets. Spurious echoes may be caused by: • Side lobes. • Indirect echoes. • Multiple echoes. • Blind sectors. • Sea, rain, or snow clutter. • Interference. Through observation, practice, and experience, you can generally detect these conditions very quickly and use the radar controls to minimize them. Side Lobes Side lobe patterns are produced by small amounts of energy from the transmitted pulses that are radiated outside the narrow main beam. The ef