Patent ID: 6292232
Filing Date: 2001-09-18
Classification: H03G,H04B

Abstract:
A receiving apparatus comprising:a reception antenna unit having a high-frequency amplifier circuit for receiving a plurality of signals of different frequency bands represented by respective selectable channels;a receiving unit, wherein said reception antenna unit and said receiving unit are connected to each other through a transmission line; andmeans for supplying an automatic gain control voltage derived from said receiving unit through said transmission line to said high-frequency amplifier circuit of said antenna unit in response to a frequency band of a signal received in accordance with each selection of a channel and a reception electric field intensity thereof, thereby controlling a high-frequency gain of said reception antenna unit, whereinsaid reception antenna unit comprises a high-frequency amplifier circuit for amplifying a high-frequency signal from a reception antenna, a first signal separating circuit for transmitting said high-frequency signal to said transmission line and separating said automatic gain control voltage signal from said receiving unit, and a feedback line through which said separated automatic gain control voltage signal is fed back to said high-frequency amplifier circuit;said receiving unit comprises a second signal separating circuit for said high-frequency signal transmitted from said antenna unit through said transmission line thereto and said automatic control voltage signal, a tuner circuit for setting the high-frequency signal from said second signal separating circuit to a predetermined channel by a channel setting means, and a voltage adding circuit for adding said automatic gain control voltage signal and a DC voltage for each received channel frequency band selected by said channel setting circuit, and whereinsaid automatic gain voltage signal added with the DC voltage from said voltage adding circuit is supplied to a first signal separating circuit of said reception antenna unit through said second signal separating circuit and said transmission line and then separated thereby, thereafter being supplied through said feedback line to said high-frequency amplifier circuit for controlling said high-frequency amplifier circuit.