About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 69. Chapters: Automatic-tracking satellite dish, Automatic Picture Transmission, Basic Interoperable Scrambling System, Block upconverter, Co-location (satellite), Commercialization of space, Communications satellite, Consultative Committee for Space Data Systems, C band, Direct-broadcast satellite, DVB-S, DVB-S2, DVB-SH, Feed horn, Fixed Service Satellite, Focal cloud, Footprint (satellite), Geosynchronous orbit, Global Telecommunications System, High resolution picture transmission, High throughput satellite, Ka band, Ku band, K band, List of communication satellite companies, List of satellites in geosynchronous orbit, Low-noise block downconverter, Low Rate Picture Transmission, L band, Mix-minus, Molniya orbit, Offset dish antenna, Orthomode transducer, Parabolic antenna, Polar mount, Q band, Rain fade, Reflector (antenna), Sat-IP, Satellite Broadcasting and Communications Association, Satellite finder, Satellite imagery, Satellite modem, Satellite space segment, Scrambler, Set-top box, Solar conjunction, Solar transit, Sparklies, Sun outage, Transponder (satellite communications), Universal Satellites Automatic Location System. Excerpt: This is the list of satellites in geosynchronous orbit. These satellites are commonly used for communication purposes, such as radio and television networks, backhaul, and direct broadcast. Traditional global navigation systems do not use geosynchronous satellites, but some SBAS navigation satellites do. A number of weather satellites are also present in geosynchronous orbits. Not included in the list below are several more classified military geosynchronous satellites, such as PAN. Listings are from west to east (decreasing longitude in the Western Hemisphere and increasing longitude in the Eastern Hemisphere) by orbital position, starting and ending with the International Date Line. Note that some of these satellites are separated from each other by as little as one tenth of a degree longitude. While that may seem like very little separation, and it is, at geosynchronous altitude (nearly 36,000 km), this corresponds to an inter-satellite spacing of approximately 73 km. The major consideration for spacing of geostationary satellites is the beamwidth at-orbit of uplink transmitters, which is primarily a factor of the size and stability of the uplink dish, as well as what frequencies the satellite's transponders receive; satellites with discontiguous frequency allocations can be much closer together. A parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves. The most common form is shaped like a dish and is popularly called a dish antenna or parabolic dish. The main advantage of a parabolic antenna is that it has high directivity. It functions similarly to a searchlight or flashlight reflector to direct the radio waves in a narrow beam, or receive radio waves from one particular direction only. Parabolic antennas have some of the highest gains, that is, they can produce the narrowest beamwidths, of any antenna type. In order to achieve narrow beamwidths, the parabolic r
