一例中波广播发射机电路严重缺陷的发现与改进

The Discovery and Improvement of a Serious Defect in the Medium Wave Broadcasting Transmitter Circuit

一台中波广播发射机大量烧毁功率放大模块的故障,通过仔细排查,经历了失败的教训,为此付出了很大代价。故障处理后,通过对电路原理图和故障的分析,故障隐患仍然存在,大规模损坏功放模块的故障可能随时再一次发生。通过对电路的改进,从而杜绝此故障的发生。

The article introduces a failure that a medium wave broadcasting transmitter des of power amplifier module. Although through the careful investigation, experienced the lessons troys a large number of failure and paid a great cost, but after the fault treatment, through the analysis on the circuit schematic and failing, the hidden trou- ble still exists and the failure of the damaged power amplifier module may be occur at any time again. The paper makes an improvement for the circuit so as to prevent this fault from happening