Introduction to FM transmitter
The FM transmitter is an abbreviation for FM transmitter. It is mainly used to wirelessly transmit the voice and music programs of FM radio stations. The FM transmitter first modulates the audio signal and the high frequency carrier into a frequency modulated wave, so that the frequency of the high frequency carrier changes with the audio signal, and then the generated high frequency signal is amplified, excited, power amplifier and a series of impedance matching, so that The signal is output to the antenna and sent out. High-frequency signals are generated by frequency synthesis, PLL, and the like. China's commercial FM radio has a frequency range of 88 MHz to 108 MHz, a campus of 76 MHz to 87 MHz, and a Western country of 70 MHz to 90 MHz.