Narrow band FM demodulator

Posted on Oct 26, 2012

For FM demodulation applications where the bandwidth is less than 10% of the carrier frequency, an XR-J567 can be used to detect the presence of the carrier signal. The output of the XR-567 is used to turn off the FM demodulator when no carrier is present, thus acting as a squelch. In the circuit shown, an XR-215 FM demodulator is used because of its wide dynamic range, high signal/noise ratio and low distortion.

Narrow band FM demodulator
Click here to download the full size of the above Circuit.

The XR-567 will detect the presence of a carrier at frequencies up to 500 kHz.

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