论文部分内容阅读
随着集成电路的发展,袖珍收音机的品种越来越多。面对商店里琳琅满目的袖珍收音机,如何选购一台适合自己需要的袖珍机呢?选购时,首要一点是看收音机的功能。在功能上,主要看收听的频率范围,也就是人们所说的有几个波段。收音机按调制方式分为调幅(AM)和调频(FM)两种。调幅包含中波(MW)、短波(SW),短波有时分成几个波
With the development of integrated circuits, portable radio varieties are more and more. The face of the store an array of pocket radios, how to choose a pocket machine for their own needs? When buying, the first thing to look at the radio features. In function, mainly to listen to the frequency range, that is, people say there are several bands. Radio modulation by modulation (AM) and FM (FM) are two. Amplitude modulation includes medium wave (MW), short wave (SW) and short wave is sometimes divided into several waves