Abstract: An apparatus and method for calibrating the output signal of a receiver having amplification over a predetermined input signal amplitude range has been described incorporating means for generating a sequence of reference signals each having a predetermined amplitude, means for coupling the sequence of reference signals to the input of the receiver, means for sensing the output reference signals of the receiver, means for storing output reference signals indicative of the amplitude along with corresponding input reference signals to provide a table of receiver input and output signals over the dynamic range such as 70 dB of the receiver. Unknown input signals are calibrated by looking up and comparing the amplitude of the output received signals of the receiver with stored output reference signals in the table and selecting the corresponding known input signals previously provided by the calibration signals.