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A New Approach to Calibrate Amplitude Modulation Receiver

The procurement of a replacement measuring receiver (Rohde & Schwarz FSMR26-N) brought in unexpected challenge to the NAVAIR Metrology Calibration program. The old measuring receiver (HP 8902A) had an AM calibration output port that generates a precise AM, which was used to calibrate the AM measurement function. The new measuring receiver did not come with such a port. This paper will explain how the NAVAIR overcame this issue by utilizing the measuring receiver’s relative power measurement of tuned RF level mode.