- Leter from Dr. Julie Brisset (Principal Investigator of the Arecibo Observatory)13 Sep, 2022
- Arecibo Deputy Principal Scientist to Explore the Cosmos with the JWST02 Sep, 2022
- Letter from the Director22 Aug, 2022
- Piercing through the Clouds of Venus with Arecibo Radar17 Aug, 2022
- Summer greetings from the Facilities and Operations Team!17 Aug, 2022
- Arecibo Observatory at the Small Bodies Assessment Group12 Aug, 2022
- Meet the 2022 Arecibo Observatory REU students!11 Aug, 2022
- Meet Luis R. Rivera Gabriel, Research Intern in the Planetary Radar Group09 Aug, 2022
- Updates from the 2022 CEDAR Workshop in Austin, TX09 Aug, 2022
- Insights into the AAS Conference from AO Analyst Anna McGilvray08 Aug, 2022
- American Astronomical Society’s 240th Meeting: Plenary Lecture Building the Future of Radio Science with the Arecibo Observatory by Dr. Héctor Arce. 28 Jul, 2022
- TRENDS 202227 Jul, 2022
- Advancing IDEA in Planetary Science 27 Jul, 2022
- The Arecibo Observatory: An Engine for Science and Scientists in Puerto Rico and Beyond27 Jul, 2022
- Cryogenic Frontend work for the 12m telescope entering phase II21 Jul, 2022
- Remote Optical Facility Updates20 Jul, 2022
Byadmin21 July 2022 Astrophysics
Figure 2: (Left) The Quadruple-Ridged Flared Horn (QRFH) with room temperature low noise amplifier. (Right) QRFH mounted on the 12m telescope for performance measurements.
Efforts to build a wideband (2.5 to 14 GHz), cryogenic front-end for the 12m telescope are steadily progressing. CryoElec, LLC, Arizona, in consultation with the Arecibo engineering team and scientists in the astronomy group is designing and building the system. During phase I of the project, parts for a custom Quadruple-Ridged Flared Horn (QRFH) were precisely machined and assembled at CryoElec. The measurements made on the horn showed excellent return loss (~ -10 db) and cross polarization performance (< -30 dB) over the frequency range 2.5 to 14 GHz. The assembled QRFH with a custom made room temperature amplifier were brought to Arecibo Observatory and installed on the 12m telescope in early June, 2022 (see Fig 2). The hot/cold load measurements on the ground provided receiver temperatures close to the expected value. On telescope measurements provided a spillover temperature between 18 and 7 K at 8 GHz for different focal distance offsets (offsets of a few inches from the nominal focal point). Based on these measurements the project will be moving forward to phase II, which includes the construction of the cryostat, the full receiver system, the control modules and the installation of the receiver on the telescope.
Head of the Astronomy Dept.