全固态PDM3KW发射机改频技术研究与实践

Studyand practice of frequency conversion technology for all solid state PDM 3KW transmitter

针对广播干扰问题,进行了基于海纳广播通讯设备有限公司生产的PDM3KW发射机从1521KHz到1557KHz的频率变换研究。通过对发射机射频电路系统高频激励器、调谐回路、末级输出网络的改造以及天调网络的匹配调整实践,实现了预期指标,取得了良好的播出效果,也提供了一种有益经验。

It is study that frequency conversion technology for all solid state PDM 3KW transmitter produced in Haina broadcasting and communication equipment Co.,Ltd from 1521KHz to 1557KHz aiming at the radio interference problem.The target expected and a good broadcast result of the study have been achievedand it also provides a useful experience by reformed high frequency exciter,tuning loop,last level output network of the transmitter RF circuit system and the adjustment of the sky network.