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In this paper we present details of the construction of a wideband, cryogenicreceiver and its successful commissioning on the Arecibo 12m telescope. Thecryogenic receiver works in the 2.5-14 GHz frequency range. The telescope isoperated by the Arecibo Observatory, and is located within the premises of theObservatory. We upgraded the current narrow band, room temperature receivers ofthe telescope with the new wideband receiver. The current receiver is builtaround a Quadruple-Ridged Flared Horn (QRHF) developed by Akgiray et al.(2013). To mitigate strong radio frequency interference (RFI) below 2.7 GHz, weinstalled a highpass filter before the first stage low noise amplifier (LNA).The QRHF, highpass filter, noise coupler and LNA are located inside a cryostatand are cooled to 15 K. The measured receiver temperature is 25 K (medianvalue) over 2.5 GHz to 14 GHz. The system temperature measured at zenith isabout 40 K near 3.1 and 8.6 GHz and the zenith antenna gains are 0.025 and0.018 K/Jy at the two frequencies respectively. In the next stage of thedevelopment, we plan to upgrade the highpass filter in order to achieve betterRFI rejection near 2.5 GHz, improve the aperture efficiency at 8.6 GHz andupgrade the IF system to increase the upper frequency of operation from 12 GHzto 14 GHz.

A Cryogenic Wideband (2.5-14 GHz) Receiver system for the Arecibo 12m Telescope