| 摘要 |
<p>PURPOSE:To prevent automatic frequency control operation from the generation of an error by connecting a gate for inhibiting the passage of a signal for a fixed period in accordance with a timing signal to the prestage of a frequency discriminating circuit in an automatic frequency control device for a pulse radar equipment. CONSTITUTION:An intermediate frequency signal S1 is amplified by an amplifier circuit AMP and then sent to a gate circuit GATE inputting a timing signal S2 outputted from a timing circuit as a gate signal. An output signal from the gate circuit GATE is sent to the frequency discriminating circuit and a detector FD through a limiter LIMIT and the output of the FD is outputted to an integration circuit INT. A DC voltage is applied to the output of the integration circuit INT by an adder ADD and the added signal is sent to a local oscillation circuit. Since the gate is closed for a prescribed period by the timing signal S2, the automatic frequency control device can be prevented from mixing of the sampling pulse signal S2 outputted from the timing circuit into a video stage and no error is generated in control operation.</p> |
