In radio link equipment, frequency control of the transmitter by the use of a resonant cavity has been used since the very early days of the radio link technology and many different AFC arrangements have been designed. One simple design uses a cylindrical cavity where both the two orthogonal TE/sub 111/ modes are exited. One mode is tuned slightly lower than the other, and diode detectors sample the power from the two modes but with opposite polarity, so the combined voltage from the two detectors appears as a discriminator curve.
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机译：在无线电链路设备中，自从无线电链路技术的早期开始，就已经设计了通过使用谐振腔对发射机进行频率控制的方法，并且已经设计了许多不同的AFC装置。一种简单的设计使用圆柱腔，在该圆柱腔中两个正交的TE / sub 111 /模式都退出了。一种模式的调谐比另一种模式稍低，二极管检测器从两种模式采样功率，但极性相反，因此，来自两个检测器的组合电压显示为鉴别曲线。
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