传统的收音机不论体积大小、功能繁简,其调台大都采用拉线指针方式。这种方式有许多缺点,如指示不准、回程差较大、使用时间长了会因拉线松驰而使传动不灵活和调谐传动机构繁杂,造成组装、维修困难等。目前,部分组合音响和收音机已使用电子调谐技术。现将索尼(SONY)公司推出的ICF-SW800FM/SW PLL(锁相环)频率合成卡片式调谐收音机的使用介绍如下。从中可 Traditional radio, no matter the size of the volume, the function is simple, most of its use of cable tying pointer mode. This approach has many shortcomings, such as instructions are not allowed, return difference is large, the use of a long time will be loose and pull the cable so that the transmission is not flexible and tuning transmission complex, resulting in assembly, maintenance difficulties. At present, some hybrid audio and radio have used electronic tuning technology. The use of the ICF-SW800FM / SW PLL (phase-locked loop) frequency synthesis card-tuned radio from SONY is described below. From it