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UHF电视发射机功率级的幅频特性,通常是指UHF电视发射机末级和末前级的板极射频谐振功率放大器双回路的幅频特性。UHF频段属于分米波段,频率很高,初级腔体与次级腔体之间不宜采用集中参数的耦合,而是采用分布参数来实现这种耦合。在这里,电容耦合起主导作用。因此,利用电容耦合双调谐回路的分析原理,指导UHF电视发射机末级和末前级幅频特性的调整,有着很重要的意义。下面就是根据我们维护UHF电视发射机的体会,以北京广播器材厂生产的CSD-10~(IV)/v-1型10kW分米波电视发射机为例,具体说明一下该机末级和末前级的板级回路的调整过程和简捷方法。
The amplitude-frequency characteristics of the power stage of a UHF television transmitter usually refer to the amplitude-frequency characteristics of the dual loops of the final RF amplifier and the final stage of the UHF television transmitter. The UHF band belongs to the decimeter band and has a high frequency. The coupling between the primary cavity and the secondary cavity should not be a centralized parameter. Instead, the distribution parameter is used to achieve this coupling. Here, capacitive coupling plays a leading role. Therefore, it is very important to analyze the amplitude-frequency characteristics of the final stage and the last stage of the UHF television transmitter by using the principle of analysis of the capacitive coupling double-tuned circuit. The following is based on our experience in the maintenance of UHF television transmitters to Beijing Broadcasting Equipment Factory production of CSD-10 ~ (IV) / v-1 10kW decimeter TV transmitter, for example, specify the aircraft last and last Pre-level board-level circuit adjustment process and a quick way.