Suggestions concerning measurement of stereophonic FM receivers

With the advent of FCC-approved stereophonic FM broadcasting, measurement techniques are required to evaluate the performance of radio sets receiving such programming. Some test procedures to obtain such measurements are formally presented in this report. The described measurements concern: Stereophonic subcarrier regeneration characteristics, separation and frequency response, harmonic distortion, 38 kc/s-subharmonic intermodulation distortion, selectivity of pilot subcarrier extraction, SCA crosstalk, adequacy of ultrasonic filtering, behavior of stereophonic-reception indicator, I-F feedback, signal-to-noise characteristics, and pilot signal “crushing”.