Patent ID: 6463268
Filing Date: 2002-10-08
Classification: H04B

Abstract:
A receiver comprising:a pre-selector to extract FM band components from a signal received by an antenna, a local oscillation circuit, a mixing circuit to perform a frequency conversion from an output signal of said pre-selector into an intermediate frequency signal by using an oscillation signal generated by said local oscillation circuit, an automatic level control (ALC) circuit to detect a level of said oscillation signal and being operable to control said level of said oscillation signal at a specified constant value so as to reduce a distorted component contained in said oscillation signal, switch means connected to said ALC circuit for switching said ALC circuit to be operational or nonoperational, and a sensitivity switching circuit for controlling a reception sensitivity of the receiver and being connected to the output signal of said pre-selector and including a series circuit of an attenuation resistor and a switch connected between the output signal of said pre-selector and ground potential, wherein said switch is interlocked with said switch means, so that in a mode of reduced sensitivity said switch mans controls said ALC circuit to be nonoperational and in a mode of increased sensitivity said switch means controls said ALC circuit to be operational.