In a radio monitoring system with at least one receiving device cyclically scanning a predefined frequency range and a plurality of evaluation devices for evaluating different parameters of the receive signal, the evaluation devices are designed in such a way that the product from the number of receive signals to be evaluated within one scanning cycle multiplied by the duration of the evaluation of the associated signal parameter remains roughly identical; control is provided by a control device, initially automatically by means of the evaluation device which requires the shortest period for evaluation of the associated signal parameter, the associated signal parameter of the receive signal is monitored and compared in a comparator with predefined limits and only those receive signals which lie within these predefined limits are fed to the evaluation device with the next lowest evaluation period which in turn monitors the next signal parameter of the receive signals and compares it in a comparator with predefined limits and in turn feeds only those receive signals which lie within these predefined limits to the evaluation device with the next lowest evaluation period etc.
