A beat frequency oscillator or BFO in radio telegraphy, is a dedicated oscillator used to create an audio frequency signal from Morse code (CW} transmissions to make them audible. The signal from the BFO is then heterodyned with the intermediate frequency signal to create an audio frequency signal. A BFO may also be used to produce an intelligible signal from a single-sideband (SSB) modulated carrier by essentially reproducing the "missing" carrier. (An amplitude modulated carrier has dual complementary sidebands and thus requires twice the bandwidth and power of SSB.) SSB is widely used in amateur or "ham" radio.
Read more about Beat Frequency Oscillator: Example
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