Antenna Radio Frequency Amplifier Speaker Or Headphone Audio Frequency Amplifier Detector High Frequency Oscillator Intermediate Frequency Amplifier MixerFilter 3800 kHz signal 3800 kHz 3800 kHz + 455 kHz = 4255 kHz 4255 + 3800 = 8055 kHz and 4255 – 3800 = 455 kHz 455 kHz