The invention relates to a method for improving the transmission quality between a data collector (3) and a plurality of measuring units, in particular consumption measuring devices (2), in a communication system (1) with preferably bidirectional radio transmission with a first communication module (10), wherein the first communication module (10) is associated with the data collector (3), and twoor more second communication modules (17), wherein each second communication module (17) is associated with one measuring unit, wherein the second communication module (17) is provided for sending data to the first communication module (10) by means of radio signals, preferably in the form of at least one radio telegram (4) preferably comprising a plurality of data packet(s), wherein the first communication module (10) is provided for receiving the data from the second communication module (17), wherein the first communication module (10) comprises a first frequency reference device (11), wherein the second communication module (17) comprises a second frequency reference device (18), wherein the radio signals transferred from the second communication module (17) to the first communicationmodule (10) in the data transmission are dependent on the second frequency reference device (18), wherein at least one parameter of the radio signal sent out by the second communication module (17) and received by the first communication module (10), from the parameter group comprising bandwidth, data rate, data rate offset, temperature from the data packet, delta frequency, modulation index, and/or reception time by the first communication module (10), is measured, an error of the second frequency reference device (18) is estimated on the basis of the parameter measurement values or values derived therefrom, and the frequency of the first frequency reference device (11) and/or at least one parameter in the first communication module (10) from the group comprising data rate, data rate offset, modulation index and frequency shift is adjusted in such a way that the error of the second frequency reference device (18) or the parameter error dependent thereon is reduced or eliminated.