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我台使用的 PDM1kW 中波广播发射机是哈尔滨正泰公司生产的全固化脉宽调制发射机,该机结构简单运行较稳定,故障率低。正常开机所具备的条件是低压电源加上后,机器通过自检:(1)PA盒状态正常;(2)驻波比状态正常;(3)电源电压±15V、+24V、-72V 正常才能进入开机程序。下面就几年来工作中经历的一些故障进行简要分析,供同行参考。故障一现象:按开机按钮,不能开机,一功放板调制故障指示灯亮,功率表无指示,PA 盒电流表无指示。
PDM1kW used in our station is a full-curing pulse width modulation transmitter manufactured by Harbin Chint Co., Ltd. The structure of the PDM1kW medium-frequency broadcast transmitter is simple and stable with low failure rate. Normal boot with the conditions are low-voltage power supply, the machine through the self-test: (1) PA box state is normal; (2) VSWR normal state; (3) the supply voltage ± 15V, +24 V, -72V normal Enter the boot process. Following a brief analysis of some of the problems experienced in the work in recent years for peer reference. Failure phenomenon: press the boot button, can not boot, a power amplifier board modulation fault indicator light, power meter no indication, PA box ammeter no instructions.