短波接收机灵敏度是衡量其性能好坏的主要指标之一。目前我省所用机器多数是239短波接收机。从我们对台站的检修情况看,有一部分239机有灵敏度下降现象。为保证收讯的质量,必须进行测试和校准。现将我们对一部分239机校准和测的方法和有关参数作一介绍。 Short-wave receiver sensitivity is one of the main indicators of its performance is good or bad. At present, most of the machines used in our province are 239 shortwave receivers. From our station overhaul situation, there is a part of 239 machines have the sensitivity of the phenomenon of decline. To ensure the quality of the reception, it must be tested and calibrated. Now we are part of 239 machine calibration and measurement methods and related parameters to make an introduction.