Radio receiver aerial circuit for motor vehicle - is tuned automatically depending on frequency of receiver oscillator

摘要

The receive aerial circuit, for a motor vehicle, is tuned to the wanted frequency automatically. The aerial tuning is linked to the frequency of the oscillator in the receiver which is connected to the circuit. The oscillator output signal needed for controlling the tuning is obtained from the aerial lead (4) connected to the receiver. The oscillator output is passed to an evaluator (6, 7) that controls the aerial circuit resonant frequency.