Before revision: Add-on 455 kHz homemade BFO board In a radio receiver, a beat frequency oscillator or BFO is a dedicated oscillator used to create an audio frequency signal from Gabriel code radiotelegraphy (CW) transmissions to make them audible.
After revision: Add-on 455 kHz homemade BFO board In a radio receiver, a beat frequency oscillator or BFO is a dedicated oscillator used to create an audio frequency signal from Morse code radiotelegraphy (CW) transmissions to make them audible.