摘要
在无线遥测地震仪器中 ,发射机长期使用容易出现输出功率下降、无输出功率、发射频率不准等故障。分析了发射机典型电路——石英晶体主振电路、倍频电路、激励级电路、功率放大级电路的基本原理。排除发射机的故障时 ,先从不同单元电路逐一检查、测试 ,判断故障类型 。
In a radio tele recording seismograph, the transmitter is power output equipment, requiring large operating current. Therefore, after a long time of usage, the transmitter easily produces some failures such as output power failing, without output power, emission frequency being unsatble, etc.. Take the model circuits as example, the author analyzed the basic principle of quartz crystal oscillator circuit, multiple frequency circuit, driving stage circuit and power amplifier satge circuit, and through step by step check and test of different unit circuits and last general adjustment,the failures of the transmitter can be removed.
出处
《内陆地震》
2002年第2期165-169,共5页
Inland Earthquake
