Related Experiment Video
Updated: Jun 1, 2025

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
Published on: June 25, 2021
Receiver design for the REACH global 21-cm signal experiment
Ian L V Roque1,2, Nima Razavi-Ghods1, Steven H Carey1
1Cavendish Astrophysics, University of Cambridge, Cambridge, UK.
Abstract:
We detail 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. For five hours of integration on a custom-made source with comparable impedance to that of the antenna used in the field, we demonstrate a calibration RMSE of 80 mK. This paper therefore documents the state of the calibrator and data analysis in December 2022 in Cambridge before shipping to South Africa.
Related Concept Videos
IR Frequency Region: X–H Stretching
Design Example
Generating Electromagnetic Radiations
Standing Electromagnetic Waves
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
Electronic Distance Measuring Instruments
IR Frequency Region: Fingerprint Region

