4131型无线列调机车电台在上海、武汉和郑州铁路局的机车上广泛应用。近年来,由于设备老化,送话器故障较多,尤其是话芯部分。表现为:无线车机联控时,车站值班员听司机声音小、音质差;机务部门进行无线录音调听时,机车送话声音小,达不到机务部门的录音音质要求,影响铁路行车安全 4131-type wireless adjustable locomotive radio station in Shanghai, Wuhan and Zhengzhou Railway Bureau locomotive widely used. In recent years, due to aging equipment, microphone failure more, especially the core part. The performance is as follows: when the wireless car control unit is connected, the station attendant listens to the driver with a small sound and poor sound quality; when the locomotive department conducts wireless recording and listening, the voice of the locomotive is small and can not reach the sound quality requirements of the locomotive department, thus affecting the traffic safety of the railway