Satcom Systems
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By Allan Tarvid When the pursuit of big fish draws you beyond the range of land-based radio and telephone services, satellite communication systems take over.
Laptop Battery Satellite communication systems vary in the geographical areas they cover, the services they provide and their equipment's size and weight. Services range from e-mail messaging that must be entered one character at a time to fax, data and voice transmission. The equipment can be as small as a telephone handset or as big as a desktop computer connected to a gyrostabilized antenna.
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Thinkpad The oldest and most comprehensive global satellite communication system is Inmarsat. Comsat Mobile Communications of Bethesda, Maryland, is the U.S. provider for Inmarsat and offers five types of service.
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Microsoft Inmarsat-A and -B provide a full range of services but require a stabilized antenna that weighs about 200 pounds, a large mounting space and enough additional equipment to make them better suited to cruise ships than sport-fishers.
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Laptop Computers Large sport-fishing craft could mount Inmarsat-M equipment for digital voice and data transmission. This system requires a 65-pound stabilized antenna and only about 10 pounds of support paraphernalia. Portable desktop phones available for Inmarsat-M are designed for land use and lack the stabilized tracking antenna. They could be used on calm seas or when in port, but they would have difficulty tracking a satellite, even in normal seas with their manually aimed antennas.
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Laptop Computer Mini-M service is the best Inmarsat choice for anglers who want voice, data, fax and e-mail service on sport-fishing craft, according to Comsat's public relations manager, Tom Surface. Mini-M offers capabilities similar to those of Inmarsat-M but uses a small, stabilized antenna that weighs only about 5 pounds backed up by compact support equipment. Planet 1 is the trade name for the Mini-M, Inmarsat service and equipment offered by Comsat.
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Desktop Computer If you can do without voice transmission, Inmarsat-C service offers a more economical way to communicate. It carries e-mail, fax and telex messages, and it can perform data transfers and vessel position reporting. The service offers navigational, safety, weather and traffic reports, maritime chart corrections and world news updates. A fixed, omnidirectional antenna that weighs about 11 pounds and a compact, 5-pound terminal unit get the job done.
Notebooks Orbcomm is another system that offers e-mail and text messaging on a global scale but not voice communication.
Lenovo It uses hand-held equipment not requiring a separate stabilized antenna. Send your GPS position to the OrbWeather e-mail in box, and you receive position-specific forecasts for the current day, the following day and the
Hard Drive following evening.
Travelstar Telegram-style messaging lets anyone ashore place a toll-free telephone call to a dispatch center representative, who transmits it to your on-board Orbcomm receiver. You can then send an answer to the dispatch center to be passed on as a phone or fax message.
Gateway Skycell satellite telephone service is available through American Mobile Satellite Corporation. Voice, fax and e-mail services are offered along with a direct, 24-hour link to the U.S. Coast Guard. The system covers North America, the Caribbean and Hawaii.
Laptop Parts Skycell marine telephones are built by KVH, Westinghouse and Mitsubishi. The KVH Tracphone and Mitsubishi ST131 use dome-covered, three-axis, stabilized tracking antennas that weigh 30 and 50 pounds respectively. The Westinghouse WaveTalk unit uses a single-axis, bicycle-helmet-size antenna that weighs about 2 pounds. This system works effectively on boats that ply calmer waters where they don't rock and roll too much.
Software The Iridium System provided in the U.S. by Motorola Cellular Service is the newest satellite telephone and paging system. This global system links 66 satellites and 15 ground stations with a roaming service of existing cellular systems around the world. Iridium's low-orbit satellites are close enough to the earth to be reached by cell-phone-style handsets. A stabilized antenna is not needed, but a small external antenna may be necessary when the phone is used under cover without a clear view of the sky.
Hard Drives Iridium went operational late
Electronics in 1998, but remains a work in progress. Data ports and modems are being developed which will allow the transmission of faxes and e-mail. Cellular partners continue to sign on, and obstacles in the way of this massive undertaking steadily fall to progress.
Canon Tom Surface sums up the bottom-line value of any satellite communication system this way. "The two things that I would hang (Satcom's) hat on are the extra safety for fishermen at sea and the convenience of instant contact with home, family, office and shore facilities (where and) when no other service can provide it."
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