Abstract
ABSTRACT The Mini-Gregorian Feed System at the Arecibo Observatory allows the highest resolution observations at 5 GHz of any single-dish radio telescope in the world. This system is a small-scale test instrument for the full Gregorian Upgrade which is currently in progress at Arecibo. In this paper we describe the performance of the Mini-Gregorian Feed in the 4.4-5.1 GHz range. This spectral range is important in radio astronomy for a number of reasons (e.g., one of the original VLA bands is at 6 cm). From a spectral line perspective, this band is important because of the presence of the 110-111 transition of formaldehyde, a standard medium-density molecular cloud tracer.
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