Research And Development Of Intelligent Control FM Radio Transmitter Based On STC12C5A60S2

The broadcast transmitter occupies a very important position in the broadcasting system, and is the key equipment of the broadcast system. With the rapid development of science and technology, and the development of broadcasting transmitters to digital, frequency modulation, intelligent, high-power direction.This thesis is based on "every village" project development has a highly integrated intelligent FM radio transmitter, which is a transmission device to transmit audio signals in a wireless transmission way.It does not need to have a pole overhead line, a wide range of radiation, unlimited expansion, easy installation and maintenance, low cost, beautiful clear sound and so on.The way of wireless transmission completely solved the traditional cable broadcast installation is complex, wiring difficulties, damaged walls, poor capacity expansion and the mountain complex environment, and many other issues,intelligent changed the previous mechanical, hardening, cumbersome and complex control methods.The design of intelligent FM radio transmitter mainly includes the design of power supply circuit, the design of intelligent control circuit, the design of FM transmitting circuit and the design of PA RF (radio frequency power amplifier) circuit.The power circuit system is a relatively mature integrated voltage regulator chip,intelligent control circuit is based on MCU (micro controller)STC12C5A60S2 as the core,FM transmitter circuit is the core of the wireless audio chip BH1414K,RF PA circuit is a buffer, pre-amplifier, amplifier, power amplifier stage intermediate level Four even put design,The buffer device for core silicon ultra high frequency low noise amplifier tube 2SC3356,The pre-amplifier core device is designed for very high frequency or ultra high frequency radio frequency amplifier circuit application and the design of FET MOS (metal oxide semiconductor field effect transistor) RD01MUS1,The middle class is the core component of MOS FET amplification transistor RD06HVF1 for VHF RF amplifier circuit design and application,The final amplifier core device is MOS FET type transistor MRF173 specifically for commercial or military broadband applications,its high power, high gain and high bandwidth characteristics, very suitable for applications in the solid state FM radio transmitter or the frequency band of the TV channel.The development of intelligent FM radio transmitter output impedance is 50Ω, output power is 50W, the transmission distance up to 10 km..