We are developing the Precision Array for Probing the Epoch of Re-ionization (PAPER) to
detect 21 cm emission from the early universe, when the first stars and galaxies were …

The low frequency array (LOFAR) is a phased array radio telescope that is currently being
built in The Netherlands with extensions throughout Europe. It was officially opened on June …

The eight-meter-wavelength transient array (ETA) is a new radio telescope consisting of 12
dual-polarized, 38 MHz-resonant dipole elements which are individually instrumented …

Sky models have been used in the past to calibrate individual low radio frequency
telescopes. In this article we generalize this approach from a single antenna to a two …

Changes in the sky noise spectrum are used to characterize perturbations in the ionosphere.
Observations were made at the same sidereal time on multiple days using a calibrated …

Experiments were performed with prototype antenna tiles for the Mileura Widefield Array
Low Frequency Demonstrator (MWA LFD) to better understand the wide-field, wide-band …

Understanding the temporal characteristics of data from low-frequency radio telescopes is of
importance in devising suitable calibration strategies. Application of time-series analysis …

The deuterium abundance in the primordial gas formed during the big bang is dependent on
the baryon-to-photon ratio during nucleosynthesis. We report a measurement of the …

We report measurements of the 327 MHz line of deuterium for regions in the Galactic plane
at 171, 183, and 195 longitude using an array of 24 stations of fixed phased-antenna …

An array of 24 stations, each with 24 crossed dipoles, has been built at the Haystack
Observatory in Westford, Massachusetts. This array has been designed to make a sensitive …