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一、自动保护电路的检修故障现象:发射机白天工作正常。晚上工作时,发射信号经常中断,且在瞬间内又自动恢复。此现象一晚上可出现十几次之多。现象解析:发射机输出信号中断时,还观察到机器末级功率表和前级输出功率监测表指示均为零。这说明故障部位在前级。信号中断后又在瞬间恢复,又说明故障出在自动保护电路上。故障只在晚上出现,说明诱发故障出现的原因还可能与卫星传播(注:我台接收卫星信号做信号源)信号的强弱有关。检修:本机激励器只在微分增益校正单元和互调校正单元设有自动保护电路。当把互调校正单元的K_2置于“保护断”时,故障消
First, the automatic protection circuit repair Fault phenomenon: Transmitter is working during the day. When working at night, the transmitted signal is often interrupted and automatically resumed within an instant. This phenomenon can appear more than ten times a night. Phenomenon analysis: When the transmitter output signal is interrupted, it is also observed that the machine end stage power meter and the preceding stage output power monitoring meter instructions are all zero. This shows the fault location in the previous stage. After the signal is interrupted again in an instant recovery, but also shows the fault in the automatic protection circuit. The fault only appears at night, indicating that the cause of the induced fault may also be related to the satellite propagation (Note: I receive satellite signal as a signal source) signal strength. Overhaul: The local exciter only with differential gain correction unit and intermodulation correction unit with automatic protection circuit. When the K_2 of the intermodulation correction unit is set to “protection off”, the malfunction is canceled