18.104.22.168 Introduction. Up to this point we have discussed basic satellite communication topics such as access and coverage. This section covers satellite link engineering with emphasis on the earth station. The approach is used to introduce the reader to essential path engineering. It expands on the basic principles introduced in Section 9.2 dealing with LOS microwave. As we saw in Section 9.3.4, an earth station is a distant RF repeater. By international agreement the satellite transponder's EIRP is limited because nearly all bands are shared by terrestrial services, principally LOS microwave. This is one reason we call satellite communication downlink-limited.
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