By D.I. Dalgleish
The purpose of this publication is to provide a transparent and concise exposition of the foundations and perform of satellite tv for pc communications by means of describing the improvement of communications-satellite providers. will probably be necessary either to engineers who've labored in different fields of telecommunication and to scholars.
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Additional info for An Introduction to Satellite Communications
6 Regional systems Regional systems such as EUTELSAT and ARABSAT provide communications between a group of countries with common interests and offer a way of spreading the very large investment required to establish a satellite system. In an area such as Europe, which already has a well-developed telecommunications network and where many of the most heavily-loaded routes are relatively short, a communications-satellite system cannot expect to attract more than a small fraction of the mainstream communications traffic.
The global-beam transmissions to and from the Fig. 9 INTELSAT V Coverage patterns satellite are left-hand circularly polarised (LHCP) and right-hand circularly polarised (RHCP), respectively; the hemi-beam transmissions have identical polarisations to the global-beam transmissions but there is no interference between them because they use different parts of the 6/4 GHz frequency bands. e. zone-beam transmissions to and from the satellite are RHCP and LHCP, respectively). Although frequency reuse by orthogonal polarisation had been employed by satellites of other systems before its use on INTELSAT V this was the first time that it had been combined with frequency reuse by means of directional antennas.
Thus the Nordic countries are developing a high-powered geostationary satellite (TELE-X) which will be used for communications and direct broadcasting to homes, and Italy is showing particular interest in the use of satellites for communications with the most southerly part of the country. 7 Leased transponders When there is insufficient domestic or regional traffic to justify the expense of putting dedicated satellites into orbit, it is usually possible to lease a transponder (or part of a transponder) on an existing satellite.
An Introduction to Satellite Communications by D.I. Dalgleish