| 摘要 |
PURPOSE:To prevent the misdetection of a disturbing signal by providing a discrimination command circuit which starts and counts the time with the detection output of a detection circuit and then outputs a discrimination command signal after a set time and at the time set in response to the change of the sweep frequency. CONSTITUTION:The sweep control voltage of a sweep control circuit 38 is monitored by a discrimination command circuit 24 with the detection output of a detection circuit 20. Then the circuit 24 outputs the discrimination command signal when the sweep control voltage set at occurrence of the detection output changes to the voltage level set in response to the change of the sweep frequency and during the voltage set in response to the change of the sweep frequency. Then a detection circuit 22 outputs a microwave detection signal as long as a discrimination command signal is produced from the circuit 24 with the detection output is produced from the circuit 20. Thus it is possible to surely discriminate the microwave signal of a signal frequency from the disturbing signal produced by the spurious reception. |
