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Superheterodyne Principle
Jun 13, 2016

Right figure for am superheterodyne radio of work principle block diagram, antenna received to of high frequency signal through entered circuit and radio of this machine oscillation frequency (its frequency more foreign high frequency signal high a fixed if, China if standard provides for 465KHZ) with into frequency tube mixed--frequency, in frequency level of load loop (selected frequency) produced a new frequency that through poor frequency produced of if (internship Figure 3-2 in the b at), if only change has carrier of frequency, original of audio package complex line and no change, If signal can be magnified, if signal after demodulation and filtering out the high frequency signals (practice d in Figure 3-2). Low power magnification, promote the speaker makes a sound.