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Gain Control <br /> Gain Selection <br /> Gain :selection. shall, be. accomplished by .a minimum of seven pushbutton.selec- . <br /> tions. Additional .gains in 1 dB. increments shall be selectable ,from keyboard <br /> input. <br /> Range Selection <br /> Pushbutton Range Selection <br /> Pushbutton range selection should accommodate a minimum of seven single <br /> keystroke ranges. <br /> Keyboard-Selected Ranges <br /> Ranges from 5 to 320 nautical miles shall be callable from the keyboard in <br /> increments of five nautical miles. <br /> • <br /> Rainfall Rate Display <br /> Calibrated Levels <br /> The following levels shall be calibrated as follows: <br /> Level DBZ Inches per Hour <br /> 0 <20 <.026 <br /> 1 20 >30 .026 >. 11 <br /> 2 30 >40 . 11 >.45 <br /> 3 >50 .45 >1 .9 <br /> 4 >50 >1 .9 <br /> Level Selection <br /> Individual rainfall levels shall. be..selectable independently. <br /> • <br /> -6- <br />