DETECTOR

Transmitters and Receivers Glossary

Transmitters and Receivers — Detector

Information on Detector

The output of the IF amplifier is applied to the detector, which recovers the information from the modulated signal. To receive Morse code, most communications receivers incorporate a beat-frequency oscillator (BFO) into the detector stage. The BFO operates at 1 kHz or 400 Hz above or below the last IF. Transitions in the RF carrier are translated into transitions in the IF, which the BFO translates into audible tones. The BFO is switched off during normal voice reception to prevent interference.

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