Factors Affecting Overall Performance of FM Stereophonic Receivers

A flat phase linear IF pass band should be designed into a high fidelity stereo tuner. A vector analysis of a tuner exhibiting an equivalent 5 usec. deemphasis in its output voltage vs. frequency characteristics shows that the major cause of poor stereo performance is related to the level differences of the L + R and L - R channels. A simple adjustment of the L + R level control in the synchronous oscillator stereophonic adapter circuit described can correct this difference.