The South Pole Telescope (SPT) is a 10-meter diameter, millimeter-wavelength telescope equipped for bolometric observations of the cosmic microwave background. To enable VLBI observations with the SPT we have constructed a coherent signal chain suitable for the South Pole environment. The dual-frequency receiver incorporates state-of-the-art SIS mixers and is installed in the SPT receiver cabin. The VLBI signal chain also includes a recording system and reference frequency generator tied to a hydrogen maser. Here we describe the SPT VLBI system design in detail and present both the lab measurements and on-sky results.
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Junhan Kim, Daniel P. Marrone, Christopher Beaudoin, John E. Carlstrom, Shepherd S. Doeleman, Thomas W. Folkers, David Forbes, Christopher H. Greer, Eugene F. Lauria, Kyle D. Massingill, Evan Mayer, Chi H. Nguyen, George Reiland, Jason SooHoo, Antony A. Stark, Laura Vertatschitsch, Jonathan Weintroub, André Young, "A VLBI receiving system for the South Pole Telescope," Proc. SPIE 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX, 107082S (9 July 2018);