Posted on Sep 24, 2012

This application involves demodulation of a frequency-modulated subcarrier of the main channel. This popular example uses the PLL to recover the SCA (Subsidiary Carrier Authorization or storecast music) signal from the combined signal of many commercial FM broadcast stations. The SCA signal is a 67l

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By connecting the circuit to a point between the FM discriminator and the deemphasis filter of an FM receiver and tuning the receiver to a station which broadcasts an SCA signal, you can obtain hours of commercial-free background music.

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