Abstract

This paper describes two FM multiplex demodulators which have been designed for systems employing transistorized FM tuners and stereo AF amplifiers. One adapter uses a frequency doubler as a carrier regenerator and employs the sum-and-difference method of restoring the two stereo channels. The other adapter uses a locked oscillator as a carrier regenerator, a time-share detector, and a stereo program indicator. Automatic switching is accomplished between stereo and monaural reception. Performance of both adapters is discussed, as well as design problems encountered

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