How is the radio tuned?
How do I tune the radio? FM broadcasting is the use of frequency modulated radio waves to transmit program content. The so-called frequency modulation is the frequency of the high-frequency signal with constant amplitude and constant frequency, which changes with the amplitude of the modulated signal. FM radio is to receive these frequency-modulated radio signals and restore them to sound waves after demodulation. The FM signal propagates in a straight line, so the coverage area is smaller than that of AM, SW and LW, but the signal quality is higher, so both TV and stereo broadcasts use FM. There are AM and FM bands on general radios or tape recorders. I believe everyone is already familiar with them. These two bands are used to listen to domestic radio. If there is SW band on the radio, in addition to domestic shortwave radio, you You can listen to radio programs from all over the world. In order to give you a better understanding of the use of the radio, the followi...