  We present two methods for measuring the noise temperature of a differential
input single-ended output (DISO) Low-Noise Amplifier (LNA) connected to an
antenna. The first method is direct measurement of the DISO LNA and antenna in
an anechoic chamber at ambient temperature. The second is a simple and low-cost
noise parameter extraction of the DISO device using a coaxial long cable. The
reconstruction of the DISO noise parameter from the noise wave measurements of
the DISO LNA with one terminated input port is discussed in detail. We
successfully applied these methods to the Murchison Widefield Array LNA and
antenna.
