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VHF band radio can be widely used in military and civilian communications , such as electricity, water conservancy , meteorology , petroleum, forestry, exploration , coal mining , railway and other industries , to achieve communication , remote control , telemetry , remote sensing , the regional alarm systems digital signal transmission , having the value of a high research and development . The project comes from the cooperation project of a railway company MIS systems research and development . \The author responsible for the commissioning of the entire VHF communication radio and baseband board FBI ( including overall debugging ) , and participate in the various modules of the circuit design and device customized . The radio transmitter and receiver , phase-locked loop (PLL) frequency synthesizer , VCO , Radio logic control core of the system are . First technical indicators on the receiver and transmitter RF front-end structure of the system , the link budget , PLL frequency synthesizer and voltage controlled oscillator (VCO) design principles are analyzed , and given the circuit and debugging method. Then discussed in detail the RF radio and baseband board FBI, focus is given to solutions of the debugging method and BER . Finally, studies of radio control the logic analysis and system monitoring design , PLL register settings and how to use single-chip phase-locked loop logic control , radio system monitoring . In the summary of the article , given some experience of the completion of the project as well as project and projects to further improve the proposed recommendations .
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