- Mar 29, 2017 -
Receiver for the quadratic conversion superheterodyne, send and receive signal input from the antenna circuit and RF band-pass filter amplifier, after a band-pass filter into a mixer, will zoom from the RF signal from the phase-locked loop frequency synthesizer circuit is the first local oscillator signal in the first and generates a first intermediate frequency signal mixer mixing. First intermediate frequency signal through the Crystal filter further clutter to eliminate adjacent channel signal. Filter after the first intermediate frequency signal into the frequency processing chip, again with the second local oscillator signal mixer generates a second intermediate frequency signal, second intermediate frequency signal through a ceramic filter removes unwanted spurious signals, amplification and frequency, audio signals. Audio signal amplifier, bandpass filters, to add to the circuit into the volume control circuit and power amplifier amplifier, driving speakers, get the information you need.