A radiofrequency receiver device including: - a local oscillator oscillating at an adjustable local frequency, - a mixer receiving radiofrequency signals and the output of the local oscillator for the supply of intermediate-frequency signals, - at least one of the elements of the set consisting of: • a band-pass filtering system , configured and placed functionally upstream from the mixer in the direction of received signal processing to filter the radiofrequency signals according to a bandpass with an adjustable frequency bandwidth, and • a low-pass filtering system , configured and placed functionally downstream from the mixer in the direction of received signal processing to filter the intermediate-frequency signals according to a bandpass with an adjustable frequency bandwidth, and - a detector configured to detect data in the intermediate-frequency signals, characterized in that it further includes: - means for storing a predetermined identification code, a minimum oscillation frequency parameter of local oscillator, a maximum oscillation frequency parameter of local oscillator, a minimum frequency bandwidth parameter and a maximum frequency bandwidth parameter, and - means for adjusting the local frequency of the local oscillator , between the minimum and maximum oscillation frequencies, and for adjusting the bandpath of the filtering system between the minimum and maximum frequency bandwidths, suitable for adjusting said local frequency and said bandpath until the detector detects the predetermined identification code in one of the intermediate-frequency signals. - a local oscillator oscillating at an adjustable local frequency, - a mixer receiving radiofrequency signals and the output of the local oscillator for the supply of intermediate-frequency signals, - at least one of the elements of the set consisting of: • a band-pass filtering system , configured and placed functionally upstream from the mixer in the direction of received signal processing to filter the radiofrequency signals according to a bandpass with an adjustable frequency bandwidth, and • a low-pass filtering system , configured and placed functionally downstream from the mixer in the direction of received signal processing to filter the intermediate-frequency signals according to a bandpass with an adjustable frequency bandwidth, and • a band-pass filtering system , configured and placed functionally upstream from the mixer in the direction of received signal processing to filter the radiofrequency signals according to a bandpass with an adjustable frequency bandwidth, and • a low-pass filtering system , configured and placed functionally downstream from the mixer in the direction of received signal processing to filter the intermediate-frequency signals according to a bandpass with an adjustable frequency bandwidth, and - a detector configured to detect data in the intermediate-frequency signals, - means for storing a predetermined identification code, a minimum oscillation frequency parameter of local oscillator, a maximum oscillation frequency parameter of local oscillator, a minimum frequency bandwidth parameter and a maximum frequency bandwidth parameter, and - means for adjusting the local frequency of the local oscillator , between the minimum and maximum oscillation frequencies, and for adjusting the bandpath of the filtering system between the minimum and maximum frequency bandwidths, suitable for adjusting said local frequency and said bandpath until the detector detects the predetermined identification code in one of the intermediate-frequency signals. <EOS>