Radio receiver with two receiving systems

Claim 1

A radio receiver apparatus comprising: a first receiver of the double superheterodyne type including a first mixer for applying a first local oscillator signal to a received RF signal so as to output a first intermediate frequency signal, a second mixer for applying a second local oscillator signal to said first intermediate frequency signal so as to output a second intermediate frequency signal, and a first detector circuit for demodulating said second intermediate frequency signal; and a second receiver of the single superheterodyne type including a third mixer for applying a third local oscillator signal to the received RF signal so as to output a third intermediate frequency signal, and a second detector circuit for demodulating said third intermediate frequency signal, wherein a single receiving frequency band is divided into at least two frequency ranges, a first frequency range and a second frequency range, and a demodulated output signal of said first receiver or that of said second receiver is selected by a user-controlled selecting means depending upon whether said received RF signal is in said first or said second range.