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电视机电调谐高频头本振频率稳定性差,一般采用AFT来稳频。本文不仅从原理上,而且用数学分析的方法阐明AFT的作用。分析表明,提高本振频率微调受控灵敏度和AFT电路的鉴频灵敏度,使本振频率稳定性获得提高。同时,指出AFT在调谐过程中所存在的问题及其解决办法。同时提出了对鉴频曲线的要求和AFT性能的三种测量方法。
TV tuner tuner frequency head vibration frequency stability is poor, the general use of AFT to frequency stabilization. This paper not only elucidates the function of AFT not only from the principle but also with the method of mathematical analysis. The analysis shows that to improve the sensitivity of the fine-tuning of the local oscillator frequency and the sensitivity of the AFT circuit, the stability of the local oscillator frequency is improved. At the same time, it points out the problems that AFT has in the process of tuning and their solutions. At the same time, the requirements of the frequency curve and the AFT performance of the three measurement methods.