2 research outputs found
The Northern Cross fast radio burst project–I: overview and pilot observations at 408 MHz
Fast radio bursts (FRBs) remain one of the most enigmatic astrophysical sources. Observations have significantly progressed over the last few years, due to the capabilities of new radio telescopes and the refurbishment of existing ones. Here, we describe the upgrade of the Northern Cross radio telescope, operating in the 400–416 MHz frequency band, with the ultimate goal of turning the array into a dedicated instrument to survey the sky for FRBs
Receiver design for the REACH global 21-cm signal experiment
We detail the the REACH radiometric system designed to enable measurements of
the 21-cm neutral hydrogen line. Included is the radiometer architecture and
end-to-end system simulations as well as a discussion of the challenges
intrinsic to highly-calibratable system development. Following this, we share
laboratory results based on the calculation of noise wave parameters utilising
an over-constrained least squares approach demonstrating a calibration RMSE of
80 mK for five hours of integration on a custom-made source with comparable
impedance to that of the antenna used in the field. This paper therefore
documents the state of the calibrator and data analysis in December 2022 in
Cambridge before shipping to South Africa.Comment: 30 pages, 19 figure