The amount of noise added by the LNA to the received signal is indicated in terms of “Noise
Temperature”. Noise temperature is specified in degrees Kelvin. For all practical purposes, the
lower the noise temperature, the better is the LNA’s performance. Approximately 10 years ago, a
noise temperature of 24 degrees Kelvin was excellent performance for commercial units. However,
with today’s improved technology, extremely low noise units such as those from Eurostar, offer a
noise temperature of 17 deg. K.