A radio receiver and a radio transmitter

摘要

A radio receiver (1) is adapted to receive radio signals in at least two frequency bands, said radio signals being modulated by information signals. The radio receiver comprises means (4, 5) for down-converting a received radio signal to an intermediate frequency signal by means of a local oscillator (5), and demodulating means (7) for recovering the information signals from the intermediate frequency signal. The frequency of the local oscillator (5) is selected so that the frequencies of at least one of said frequency bands are above the frequency of the local oscillator, and the frequencies of at least one of said frequency bands are below the frequency of the local oscillator. The same principle is used in a radio transmitter. <IMAGE>