铁路站场作业是多工种的联动作业,需由车站、机务、车辆、工务、电务等工作人员分散作业来共同完成。他们之间除由电话联系沟通外,站场广播是不可缺少的通信工具之一。长期以来,铁路站场广播采用预热式电子管扩音机,配扩音转接架、24V电源箱及前级放大设备,其输出功率为100、150、200、275、300W。电子管扩音机功耗高、体积大、机身重、寿命短。 Railway station yard work is a multi-species linkage operation, required by the station, maintenance, vehicles, public works, electricity and other staff to work scattered to work together to complete. Apart from their contact by telephone communication, the station broadcast is an indispensable communication tool. For a long time, the railway station broadcasting using preheated tube amplifiers, with PA adapter, 24V power box and preamplifier, the output power of 100,150,200,275,300 W. Tube amplifier high power consumption, bulky, heavy body, short life expectancy.