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电子调谐器是彩色电视机的重要组成部分.调谐器的作用是使接收机对接收频率具有良好的选择性和信噪比,并将高频信号变换为中频信号.电子调谐器与机械调谐器的主要区别是:电子调谐器频道转换是利用变容二极管在反向偏置时的结电容随所加反向偏压的变化而实现调谐的.为使调谐器满足整机技术指标,电子调谐器的生产必须具备良好的测试手段.目前,国内生产厂家主要从日本的松下、三洋、夏普三家公司引进生产线.然而,这三家公司制造的电子调谐
Electronic tuner is an important part of color TV.The role of the tuner is to make the receiver has a good selectivity to the receiving frequency and signal to noise ratio, and the high frequency signal is converted to intermediate frequency signal.Electronic tuner and mechanical tuner The main difference is: Electronic tuner channel conversion is the use of varactor diodes in the reverse bias when the junction capacitance with the reverse bias voltage applied to achieve the change.To make the tuner to meet the technical specifications of the machine, the electronic tuner Of the production must have a good test means.At present, the domestic manufacturers mainly from Japan’s Panasonic, Sanyo, Sharp three companies to introduce production lines.However, the electronic tuning of the three companies