Patent ID: 7102511

Claim:
A radio wave detection device comprising: an electric wave receiving/amplifying circuit including an antenna for receiving electric wave signal in the environment, a first amplifier and a second amplifier, the received electric wave signal being preliminarily amplified by the first amplifier and further amplified by the second amplifier and then output; a rectifying circuit connected with the second amplifier of the electric wave receiving/amplifying circuit for receiving the output signal and converting the signal into analog level voltage, the level voltage being then output; a power supply for providing power to the respective components of the detection device; a reference resistance circuit composed of multiple serially connected resistors with different resistances, a stabilizing integrated circuit of the power supply outputting a stable voltage to the reference resistance circuit so as to create voltage drop between two ends of the resistors and form different reference level voltages; and a central processor to which the reference level voltages are output, the central processor serving to select a suitable reference level voltage on the basis of the voltage of the power supply and compare the selected reference level voltage with the level voltage output by the rectifying circuit, whereby after compared, the result of detection is shown by a sound/light output unit by way of light and sound.