| 摘要 |
The generation frequency band of a first IF signal generated by a digital signal modulator (11a) frequency band of a transmission signal, is adjusted depending on the so that the generation frequency band is compatible with the upper frequency edge of a first IF band-pass filter (14). In addition, the oscillation frequency of a first local oscillator (24a) is adjusted so that a second IF signal, generated by converting the first IF signal by a first frequency converter (23a), compatible with the lower frequency edge of a second IF band-pass filter (25). This allows the transmission signal, including a plurality of frequency bands, to be transmitted with no additional filter and without providing a switch for the filter.
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