Design And Implementation Of VHF Ultra-short Wave Radio Receiver

High mobility is an important characteristic of modern communication.It is a constant problem to provide reliable and uninterrupted communication guarantee for mobile use.Radio stations because of its lightweight,flexible,easy to use,is a major means of maneuvering condition to maintain communication,has become the mainstream of on-the-move and field communication equipment,for the mobile communication plays a significant role.In all the major activities,has been performing well,plays an important role.It is now the most used and widely used device.The regular working frequency of radio station is mainly divided into short-wave radio and ultra-short-wave radio.VHF ultrashort wave radio mainly works in 30 MHz ~ 88 MHz VHF frequency band and communicates by means of parallax transmission.Compared with short-wave communication,VHF ultra-short wave communication has good quality and large channel capacity.It is less affected by day and night and seasonal changes.Compared with UHF ultrashort wave communication,it has certain diffraction capability and ground wave propagation characteristics,and it is the main means of ground communication and ground-air collaborative communication.Receivers,as an important part of radio,have always been the focus of communication engineers.Especially with the expansion of radio service types and demands,the demands of high-speed data transmission and anti-interference are more and more obvious.The new service also puts forward higher requirements for the large dynamic working ability,high linearity,low noise and fast frequency agility of radio receivers.This topic comes from Shaanxi Fenghuo Electronics Co.,Ltd.,a 30 MHz ~ 87.975 MHz VHF ultra-short wave narrowband high-speed data radio project,which is the development of receivers.1.According to the project requirements,through to the receiver in the form of organization structure analysis and the analysis of the key technical performance indicators,determine the overall technology meet the requirements and to facilitate the transition of the receiver to the superheterodyne receiver structure,two mixing solution.2.According to the overall scheme,the paper mainly discusses the receiver channel linearization technology,fast automatic gain control technology and fast frequency synthesizer technology,and forms a detailed design scheme.3.Completed the circuit design and implementation of all functional modules of the receiver and the design of printing plate.4.Complete the test and engine test of each function module implements the machine-120 dBm ~ 0 dBm receive large dynamic range,the phase noise from the frequency spectrum of vibration is not greater than 2 KHz place-80 dBc/Hz,2 deviates from the main frequency of vibration place no more than 20 KHz-120 dBc/Hz technical performance,the overall technical performance to meet project requirements.