| 摘要 |
Pulse radar apparatus comprising at least an error voltage generator, a dither-tuned magnetron, a frequency control circuit, a conditional circuit and an angular position indicator connected to the magnetron tuning shaft for turning the local oscillator frequency fl to a frequency flo, showing a fixed difference fo with the magnetron frequency, where fo = fz - flo. When, by means of the indicator, the conditional circuit determines that the magnetron is being tuned in a defined frequency range comprising the frequency fl, the frequency control circuit is alternatively supplied with an error voltage and a voltage proportional to df , dt TO DELIVER A FINE AND A COARSE TUNING VOLTAGE, RESPECTIVELY. |
