Compensating amplification circuit for installation in a transmission line between a mobile radio set located in a motor vehicle or a vehicle-based holding fixture for the mobile radio device and an antenna of the motor vehicle, and method for operating a corresponding bidirectional compensating amplification circuit

摘要

The compensation amplifying circuit (1) has a receiver amplifying device (7) by which a receiving signal is received by an antenna (3) of the motor vehicle and is supplied to the mobile radio unit by the transmission line. A transmitter amplifying device (17) transmits the transmission signal from the mobile radio unit and supplies to the antenna of the motor vehicle by the transmission line. The detector devices (15,16) detect an operating state of the mobile radio unit present in the motor vehicle. The operating state is processed to a detector signal. A selection device is provided by which the operating state of the compensation amplifying circuit is adapted to the operating state of the mobile radio unit. The selection device has a filter with adjustable transmission characteristics. The transmission characteristics of the filter are adjustable according to the detector signal by an evaluation device. An independent claim is included for a method for operating a bidirectional compensation amplifying circuit.