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一开始,大多数调幅广播发射机均采用屏极调制方法。最近,另外几种调制方法已逐步被采用了,即脉宽调制(PDM),改进的道赫特(Doherty也译作“多尔蒂”)线路和切雷克斯(Chireix)幅相调制。本文将传统的屏极调制和其它几种较新的调制方法进行比较。也考虑和比较了每种制式的性能及经济因素。
In the beginning, most AM transmitters used a panel modulation method. Recently, several other modulation methods have been gradually adopted, namely pulse width modulation (PDM), modified Doherty (Doherty) and Chireix amplitude modulation. This article compares traditional screen modulation with several more recent modulation methods. Also considered and compared the performance of each standard and economic factors.