Patent ID: 7463870

Claim:
A method for controlling a circuit for reception of signals that are modulated onto electromagnetic waves, the circuit including an antenna, a controllable amplifier, a frequency converter with a tunable oscillator, and a decoder decoding a digitally coded signal received by the antenna, the method including the steps of: receiving a digitally coded signal; generating a control signal indicative of the signal quality from the received and decoded digital signal; applying the control signal to an antenna arrangement for varying the resonant frequency of the antenna arrangement; varying the resonant frequency of the antenna first in one direction, starting from a previously set value; determining, after said varying of the resonant frequency, the signal indicative of the signal quality; and if the signal indicates that signal quality is better than before said varying, effecting a further change in the same direction, and determining the signal quality again; or if the signal indicates that signal quality is poorer than before said varying, effecting a further change in the opposite direction, and determining the signal quality again; wherein varying the resonant frequency is performed continuously.