The MG3631A Synthesized Signal Generator is provided with amplitude and frequency modulation in the frequency range of 0.1 to 1040 MHz. Since the MG3631A also has excellent basic performance in regards to frequency stability, output level accuracy, and signal purity, it can be used in a wide range of applications and are suitable for performance evaluation of various receivers (mobile radio, paper, AM/FM radio, etc.), or as the general-purpose signal sources. Furthermore, memory functions and a GB-lB interface are provided as a standard. Therefore, it is useful for elemination or reduction of labor and automation for measurement.