Satellite Technology - An Introduction by Andrew F Inglis
By Andrew F Inglis
It is a entire replace of this renowned instruction manual exploring the area of verbal exchange satellites. Written in easy-to-understand language, this booklet covers subject matters starting from theories of satellite tv for pc operation to sensible directions for the preliminary set-up of cellular earth stations. the second one variation has been completely up to date to incorporate:
• The influence of speedy advances in electronic technology
• The mass deployment of electronic DBS systems
• New projects in satellite tv for pc design
• adjustments in regulations
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Extra info for Satellite Technology - An Introduction
The length and number of the outages depends on the latitude of the earth station and the diameter of the antenna. At an average latitude of 40 ° in the continental United States, and a I 0-meter antenna, the outages occur over 6 days with a maximum duration of 8 minutes each day. With a less directional 3-meter antenna, the outages occur over 15 days, with a maximum duration of 24 minutes. The times and durations of sun outages can be calculated precisely, ~but this requires the use of astronomical tables that are frequently not available in the broadcasting industry, An easier way is to obtain the information from the satellite carriers, all of which have developed computer programs for outage calculations.
Lla~$ 18 SatelliteTechnology The antenna gain and the quality of the LNA are the key receiver components in determining its most basic performance specification, the SNg. The quality ofcommercial LNA amplifiers varies widely in accordance with their cost. The difference in noise performance of a cryogenically cooled LNA in a major earth station and an inexpensive backyard-dish LNA may be 10 dB or more. 6 SUMMARY A satellite communication system has two major components, the earth segment and the space segment The earth segment includes (1) an uplink earth station that transmits a signal to the satellite and (2) a downlink earth station that receives and amplifies the signal transmitted back to earth by the satellite.
9 TRANSPONDERS USED FOR TELEVISION PROGRAM TRANSMISSION The listing of television services available on satellite transponders is volatile and changes frequently. 5 A recent (1997) issue of Satellite TV Week, a newspaper distributed to backyard dish users, shows more than 300 C-band transponders and 80 Ku-band transponders devoted to television programs, sources, or news feeds. The total usage of transponders by television program services, more than 380, makes the television industry the largest market for satellite transmission in the United States.