The MG3671A/B is a Digital Modulation Signal Generator equipped with a high performance quadrature modulator. It outputs the signals needed to develop, test and evaluate digital mobile communications equipment and related devices. The MG3671A/B covers the frequency range from 300 kHz to 2.75 GHz, and provides a stable and precise output level as well as spectral purity, even with modulation. The MG3671A/B operates normally at temperature from 0 to 50 _C. To operate the MG3671A/B normally, it requires a single phase ac power source of 100 to 120 Vac for 100 Vac system or 200 to 240 Vac for the 200 Vac system, and 47.5 to 63 Hz.