前段时间,我台三十八频道主发射机在播出中出现功率忽大忽小直至掉功率故障,在发射机现场观察,发现激励器工作状态在发射机大ALC控制回路和激励器小ALC控制回路以及安全模式之间来回切换,为此及时采取了倒备机工作。初步判断故障应该是激励器故障,事后通过对激励器的检修,发现故障出在激励器互调校正电路中的ALC控制电路。下面就对这一ALC电路及故障做点分析。我们知道激励器的主要作用有这样几个方面,一是对 Some time ago, my Taiwan 38 channel main transmitter appeared in the broadcast power suddenly suddenly small until the power failure, observed at the transmitter site and found the working state of the actuator in the transmitter ALC large control loop and the actuator ALC Control circuit and switch back and forth between safe mode, for which timely take a backup machine work. The initial judgment fault should be the exciter fault, and afterwards through the overhaul of the exciter, it is found that the fault is in the ALC control circuit of the exciter intermodulation correction circuit. Below on the ALC circuit and fault analysis. We know the main role of the exciter has several aspects, one is right