Chapter 7

Radio system design

Abstract

Performance characteristics of a radio communication system are reviewed in detail in this chapter. We describe the conditions that affect communication range, and then deal with the various factors that determine receiver sensitivity. Noise figure calculations per stage and cascaded noise figure are presented. We saw that external noise sources, principally man-made noise, must be taken into account to determine true sensitivity, which is a function of the relative intensity of noise received by the antenna to the noise generated in the receiver. Susceptibility of superheterodyne receivers to image and other spurious frequencies is discussed along with how to calculate these frequencies and ways to ...

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