Patent ID: 7386278

Claim:
A communication apparatus comprising: a fixed local oscillation means for generating a fixed frequency signal having a specified frequency; a transmission modulation means for modulating a transmission signal based on a frequency of the fixed frequency signal; a third local oscillation means for generating a third signal having a frequency within a specified range; a transmission signal output means which changes a frequency output from the transmission modulation means to a sum or a difference between a frequency of the third signal and a frequency output from the transmission modulation means and outputs the frequency in accordance with a type of the transmission signal; a plurality of reception demodulation means which is provided for reception signal types and demodulates the reception signal based on a reception demodulation frequency; a fourth local oscillation means for generating a fourth signal having a frequency within a specified range; and a reception demodulation frequency output means for supplying the reception demodulation frequency to the reception demodulation means based on output of the fourth local oscillation means and the fixed frequency signal.