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By D.I. Dalgleish

The purpose of this booklet is to offer a transparent and concise exposition of the rules and perform of satellite tv for pc communications by way of describing the improvement of communications-satellite prone. it will likely be precious either to engineers who've labored in different fields of telecommunication and to scholars.

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VSAT systems may be interactive, may have a selective-addressing facility and often use packet switching. Typical applications are credit-card verification at petrol stations, stock control for large chains of retail premises, distribution of stock exchange prices and collection of geophysical data. The use of very small antennas at earth stations requires the use of high satellite powers for the transmission of relatively low bit rates but this is economic because the cost per station is small.

Many of these stations were being used by private households for free (legal) reception of programmes intended for paying customers such as cable-TV networks and hotels, and some were being used (illegally) by 'pirates' who were supplying television services to blocks of flats and other customers. As a result, the use of encoding (to prevent unauthorised reception) quickly became widespread and, for a short time, there was a downturn in the sales of TVRO stations. 10). 4 Indonesia The next country, after the USA, to use satellite communications for domestic purposes was Indonesia.

The SATCOM system, like the ANIK system, provides a wide range of services including service to remote communities. In this case the remote locations are in Alaska where, for the commencement of service, the State authorities bought 100 small earth stations which were installed in communities which had hitherto had no telephones. SATCOM also brought television to these communities for the first time and this provided educational programmes as well as entertainment. The latest SATCOM satellite now serves more than 200 community stations in Alaska.

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