CHAPTER 21Antenna Noise Temperature
Radio reception is essentially a matter of signal-to-noise ratio (SNR). Signals must be at or above some amplitude relative to the noise floor of the system in order to be detected properly for their intended use. All electronic systems (receivers and antennas included) generate noise internally, even if there is no power flowing in them. While we normally think in terms of the antenna designer maximizing signal strength to overcome noise, often a second goal is to minimize the noise from some or all of the various sources.
In general, at HF and below, the external signals and noise sources detected by the antennas described in this book (including even the very low efficiency antennas of Chap. 14) are strong ...
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