By D.I. Dalgleish
The purpose of this e-book is to provide a transparent and concise exposition of the rules and perform of satellite tv for pc communications by means of describing the improvement of communications-satellite prone. it is going to be invaluable either to engineers who've labored in different fields of telecommunication and to scholars.
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Additional resources for An Introduction to Satellite Communications
1 FM Virtually all the early experimental and operational communications-satellite systems used frequency modulation (FM) and a large proportion of the telephony traffic on the INTELSAT system is still transmitted on frequencymodulated carriers. However, most new earth-station equipment (with the exception of equipment for transmitting and receiving broadcast-standard television transmissions) uses digital techniques and in another five years digital transmissions will probably account for about 90% of all telephony and data traffic in the fixed satellite service (FSS).
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. Other early brands of US communications satellite were WESTAR (the first of which was launched by Western Union in 1973) and COMSTAR (ComSat General, 1975).
It is switched on only when speech is present. Because the two parties to a telephone conversation do not usually speak simultaneously, and because there are silent intervals between sentences, words and syllables, voice activation reduces the average number of voice carriers by 60% or more. The satellite power available to each carrier is therefore more than doubled and, at the same time, the reduction in the number of carriers abates the intermodulation noise power. Virtually all FM-SCPC systems use companded speech channels.