雷达在工作中,接收机的本振频率和发射机磁控管频率都会发生漂移,从而使接收机灵敏度下降,荧光屏图象质量变差。自动频率微调系统(以下简称自频调)维持本振速调管振荡频率总是比磁控管发射频率高出一个标准中频(例如60兆周)。图1是导航雷达自频调系统方框图。在发射机没有工作 Radar at work, the receiver's local oscillator frequency and transmitter magnetron frequency drift occurs, so that the receiver sensitivity decreased, the quality of the screen image deterioration. Automatic frequency fine tuning system (hereinafter referred to as self-tone) Maintains the oscillation frequency of the local oscillator tube is always higher than the magnetron emission frequency by a standard IF (for example, 60 trillion weeks). Figure 1 is a navigation radar self-tuning system block diagram. No work at the transmitter