Patent ID: 6041083
Filing Date: 2000-03-21
Classification: H03J

Abstract:
A method for tuning at least one tunable resonance module in a radio base station, said resonance module having tuning means, a transmitter connection, and an antenna connection, said method comprising the steps of:(a) mixing an input signal, originating from a transmitter signal present on the transmitter connection, with a low-frequency signal so as to generate a single side band signal,(b) mixing with the single side band signal an output signal being offset in phase from the input signal by a relative first phase difference dependent on a present tuning of the resonance module, said output signal being one in a group consisting of: a signal originating from an antenna signal present on the antenna connection, and a signal probed within the resonance module,(c) mixing the single side band signal with a signal originating from the transmitter signal on the transmitter connection,(d) comparing, at a frequency range about that of the low-frequency signal, mixing products resulting from steps (b) and (c), respectively, so as to determine a relative second phase difference between the input and output signals, and(e) operating, based on said second phase difference, the tuning means to tune the resonance module to a frequency of the transmitter signal present on the transmitter connection, so as to adjust said second phase difference to a predetermined value.