CRYSTAL CONTROLLED MAGNETRON

摘要

A weather radar system in which a magnetron transmitter (10) is controlled in frequency by a low power locking signal from a stable frequency source (25). An automatic frequency control (AFC) (44) maintains frequency lock between the source (25) and the magnetron (10) without requiring injection signals of excessive power. The frequency source (25) controlling the magnetron (10) also generates several local oscillator frequencies required by the system receiver. Therefore, the pulse to pulse transmitted signals, return signals and receiver i.f. signals all possess a high degree of phase coherence, readily permitting detection and determination of the doppler frequencies contained in the return signals.