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来源：百度知道 编辑：UC知道 时间：2024/06/20 15:51:57
2．50W功率放大器由两只MRF173组成；100W功率放大器由一只BLF278组成。放大器的输出接有滤波器，可有效抑制带外谐波和无用发射分量。该滤波器还同时产生入射功率及反射功率指示信号并送至监控单元。监控单元可实时监视放大器的电流、电压和功率并由面板电表显示。当电流、反射及温升超过设备设置门限时，将切断放大器的偏置电压，实现过温、过流及驻波比过大保护。3．施工准备阶段主要完善必要的线外工程及辅助工程，包括项目部、预制场及拌合场的选址、临时土地征用及施工便道、料场便道施工，理顺与地方群众的关系，为大规模的机械设备及人员进场创造条件。4．改沟、改线等线外工程先期实施，同时本标段在澄碧河水库西岸部分路段占用G324国道，因此在主体工程大规模施工前，必须根据设计要求恢复G324国道，完善防撞及排水设施，以确保主体工程施工时，地方交通及排灌系统的畅通。

the 2.50W power amplifier is composed of two MRF173; the 100W power amplifier is composed of BLF278. Amplifier's output meets has the filter, but outside effective stop band overtone and unwanted emission component. This filter also simultaneously have the incident power and the reflection power rate pilot signal and deliver to the monitoring unit. The monitoring unit may the real-time surveillance amplifier's electric current, the voltage and the power and demonstrated by the kneading board electric instrument. When the electric current, the reflection and the temperature rise surpass the equipment establishment threshold, will shut off amplifier's bias voltage, has realized warm, the overflow and the standing-wave ratio oversized protection. 3. outside the construction preparatory stage main consummation essential line the project and the off-set utilities, including the project department, the prefabricated field and mix the field the selected location, temporary land