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In this paper, we developed a local oscillator (LO) system of millimeter wave band receiver for radio astronomy observation.\udWe measured the phase and amplitude drift stability of this LO system. The voltage control oscillator (VCO) of this\udLO system use the 3 mm band Gunn oscillator. We developed the digital phase locked loop (DPLL) module for the LO\udPLL function that can be computer-controlled. To verify the performance, we measured the output frequency/power\udand the phase/amplitude drift stability of the developed module and the commercial PLL module, respectively. We show\udthe good performance of the LO system based on the developed PLL module from the measured data analysis. The test\udresults and discussion will be useful tutorial reference to design the LO system for very long baseline interferometry\ud(VLBI) receiver and single dish radio astronomy receiver at the 3 mm frequency band

Phase and Amplitude Drift Research of Millimeter Wave Band Local Oscillator System