Abstract: A radio device for operation in at least two different radio systems having unequal bands of operating frequencies represented by channels numbers. The device includes a radio transmitter; a radio receiver; a frequency synthesizer for generating local oscillator frequencies for the radio transmitter and radio receiver, respectively; and a control for controlling the frequency synthesizer so as to lock it to transmitting and receiving frequencies corresponding to a selected channel number. The control includes a memory for storing frequency synthesizer control data of a single channel number for each different radio system, on the basis of which control data the control is capable of deriving control data of any other channel number for the radio system in which the radio device is currently operating.