Patent ID: 8462883

Claim:
A transmission apparatus comprising: a baseband signal generator that generates a baseband signal; a local oscillator that oscillates a local oscillation frequency; a modulator that generates a modulation signal by multiplying the baseband signal by a carrier wave signal including the local oscillation frequency; a power amplifier that amplifies the modulation signal; a filter having a pass bandwidth that is narrower than a frequency bandwidth that can be set or emerge in the local oscillator and removes at least a part of unwanted component generated in association with the modulation signal that is amplified; and a frequency bandwidth inside/outside decision unit that decides that the local oscillation frequency is out of a predetermined bandwidth, wherein the transmission apparatus controls one of the baseband signal generator and the local oscillator to reduce the modulation signal when it is decided by the frequency bandwidth inside/outside decision unit that the local oscillation frequency is out of the predetermined bandwidth.