Dual-band data communication device

摘要: The direction of rotation the phase signals in a dual-band digital demodulation processing means 110 and a dual-band digital modulation 112 is controlled in accordance with band selection control 113 for selecting first-band local oscillator 105 or second-band local 106 so as to be reversed an even number of times total. of signals return its original of rotation finally if there difference between the first second bands high/low relationship the transmission/reception frequency oscillation frequency. Accordingly, reception data can outputted properly, transmission wave outputted properly. Since it possible attain reception properly any oscillation frequency, degree freedom selecting local oscillation increased.