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We report on the experimental realization of a sub-mm wavelength oscillator based on HTS Josephson junctions integrated on-chip with detector Josephson junction-mixer. Detector and oscillator are coupled via a microstripline. The oscillator is a 2-dimensional (2D) network (array) of 20 HTS step-edge junctions. The array is biased in parallel, i.e. all junctions of the network are oscillating with the same frequency. Effective pumping of the Josephson mixer was possible up to several hundred GHz. The best results, i.e. significant depression of the critical current and steep Shapiro steps up to the 4th order, were obtained between 150 GHz and 200 GHz. Power transfer was detectable up to frequencies around 1.15 THz.