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The Seoul Radio Astronomy Observatory (SRAO) operates a 6.1-meter radiotelescope on the Gwanak campus of Seoul National University. We present theefforts to reform SRAO to a Very Long Baseline Interferometry (VLBI) station,motivated by recent achievements by millimeter interferometer networks such asEvent Horizon Telescope, East Asia VLBI Network, and Korean VLBI Network (KVN).For this goal, we installed a receiver that had been used in the Combined Arrayfor Research in Millimeter-wave Astronomy and a digital backend, including anH-maser clock. The existing hardware and software were also revised, which hadbeen dedicated only to single-dish operations. After several years ofpreparations and test observations in 1 and 3-millimeter bands, a fringe wassuccessfully detected toward 3C 84 in 86 GHz in June 2022 for a baselinebetween SRAO and KVN Ulsan station separated by 300 km. Thanks to the dualfrequency operation of the receiver, the VLBI observations will soon beextended to the 1 mm band and verify the frequency phase referencing techniquebetween 1 and 3-millimeter bands.

Renovation of Seoul Radio Astronomy Observatory and Its First Millimeter VLBI Observations