Artificial satellites are those put into orbit by man. Equipment on a satellite is hardened to survive in the radiation and vacuum of space. Since there is no air in space and therefore no air resistance‚ satellites come in many shapes and sizes. Types of Satellites and their Uses We use satellites for different purposes and all satellites can be placed in one of the following categories: Communications Satellites Distribution of television and audio signals‚ and telephone connections via satellite
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1 SATELLITE COMMUNICATION – AN INTRODUCTION Contents 1.1 Introduction 1.2 Basics 1.3 Applications of Satellites o Weather Forecasting o Radio and TV Broadcast o Military o Navigation o Global Telephone o Connecting Remote Areas o Global Mobile Communication 1.4 Frequency Allocation of Satellites 1.5 Types of Orbits o GEO o LEO o MEO o Sun Synchronous Orbit o Hohmann Transfer Orbit o Prograde Orbit o Retrograde Orbit o Polar Orbits 1.6 Examples o INTELSAT o U.S. Domsats o Polar Orbiting Satellites
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Satellite Communication Engineering Michael O. Kolawole Jolade Pty. Ltd. Melbourne‚ Australia Marcel Dekker‚ Inc. TM New York • Basel Copyright © 2002 by Marcel Dekker‚ Inc. All Rights Reserved. ISBN: 0-8247-0777-X This book is printed on acid-free paper. Headquarters Marcel Dekker‚ Inc. 270 Madison Avenue‚ New York‚ NY 10016 tel: 212-696-9000; fax: 212-685-4540 Eastern Hemisphere Distribution Marcel Dekker AG Hutgasse 4‚ Postfach 812‚ CH-4001 Basel‚ Switzerland tel: 41-61-261-8482; fax: 41-61-261-8896
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Submarine cables Laying of cables in the oceans of our world is a fascinating business. Real men and women toil long and tedious hours to make this possible. Submarine cables are laid down by using specially modified ships (sometimes even purpose built ships) that carry the submarine cable on board and slowly lay it out on the seabed as per the charts/plans given by the cable operator. The ships can carry with them up to 2‚000 kilometers length of cable. Depending on the equipment on-board
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Introduction Coaxial cable: is an electrical cable consisting of a round conducting wire‚ surrounded by an insulating spacer‚ surrounded by a cylindrical conducting sheath‚ usually surrounded by a final insulating layer. It is used as a high-frequency transmission line to carry a high-frequency or broadband signal. Sometimes DC power (called bias) is added to the signal to supply the equipment at the other end‚ as in direct broadcast satellite receivers. Because the electromagnetic field carrying
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cable modem: ABSTRACT Cable modems are devices that allow high-speed access to information at a distant server may it be Internet server or video on demand server‚ via a cable television network. While similar to the traditional (analog) dialup modems‚ a cable modem is significantly more powerful‚ capable of delivering data approximately 500 times faster. During the early to mid - 1990s‚ the two-way interactive communication capability of the existing cable network infrastructure was realized
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Chapter #1-What is Satellite Radio? People all around the world have their favorite radio stations that are preset into car radios‚ flipping between them driving to and from work‚ on errands and around town. The only problem is‚ when traveling too far away from the source station‚ the signal breaks up and fades into static. Most radio signals can only travel about 30 or 40 miles from their source‚ in big market areas. Looking around Canada‚ there are many areas where terrestrial radio is just not
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Electrical Cable Cross section is just a two-dimensional view of a slice through an object. An often asked question: How can you convert the diameter of a round wire d to the circle cross section surface or the cross-section area A (slice plane) to the cable diameter d? Resistance varies inversely with the cross-sectional area of a wire. | ------------------------------------------------- Top of Form | Wire diameter d | unit | | | Cross-sectional area A | unit2 | | |
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Data Collection - Ace Cable RES 351 Data Collection - Ace Cable As stated in the week two‚ Ace Cable is an established company that offers cable television‚ telephone and internet services to its customers. These services are available to customers across the United States and they have been in business since 2000. In recent years‚ the competition has grown and Ace Cable is experiencing a decrease in customer enrollments. Customers now have multiple options to consider before enrolling
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Will to Survive Survivor; somebody who shows a great will to live. Somebody with a great will in life will survive. We all know that it is true‚ yes; we all have free wills that depend on our actions and decisions. Like flying over a rainbow‚ we feel so free and majestically swayed by the exquisite taste of an extraordinary view. We chose to get there‚ we chose the feeling that we’ll get‚ and we chose everything that we do every second of that splendid experience. It is the point of free will
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