Definition
Gain sets receiver amplification and should be adjusted on a long range scale with clutter controls off, until a light speckled background noise is just visible; less than that means weak targets are being lost. Tune matches the receiver to the transmitter frequency in magnetron sets and drifts as the magnetron ages, so a set that has lost range often only needs retuning. Solid-state radars are inherently tuned and offer no such control.
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