The method involves determining frequency sample independent of coded data in a message received by an ID-sensor. A radio communication is implemented between a radio transmitting device and a receiving device of a control device. A carrier frequency of the transmitting device is selected based on the sample, during the transmission of another message with coded another data. The receiving device is adjusted in dependent of the former data at the carrier frequency according to the sample. The authentication for the access to a vehicle is found in dependent of the latter data.
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